Andrew Pritchard.

A history of Infusoria, including the Desmidiaceæ and Diatomaceæ. British and foreign online

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microstoma by Stein: a, external coat; 6, nucleus; c, Teside. In 2 a rilialyd cmfasyo
appears withm a distinct sac 3-6. Podophrya fiza ^X represented by Stein aa taoAet
pinse, besides figs. 1 and 2, in the development of Vortaoella microatoma. A ciliated gena
u seen in 4. whidi in 5 is about to escape. 6-8. Other fcHrms of Podophryean Arwm^a^ m
fllgured by Stein : 6^ 7. As treated with acetic acid ; the derelopment of an embryo from
the nudiras is shown in figs. 7 and 8. 9-14. Yortioella-cystB, after Stein's figures. In 9
the nucleus is resolred into monadiform germs ; 10, 11. I>eTelopment of cyat^onteoti into
aeoondaiy cysts, which aro further seen in figs. 12 and 13 as become fumform and protruded
thrcmgfa the wall of parent cyst, so as to discharge their monadiform germs without, as seoi
in fig. 14. 16^ 16. Acineta diademiformis, with its embryo. 17-^M>. A. linguiftra, or
Adnata with the tongue-like process attributed to Opercularia berberina ; 20 shows an
empty capsule. 2L A. digitata, ot Acineta with the finger-like processes. 22^ 23. Aeinels
attribtttod by Stein to Opercularia liofatensteinii ; 23. A speoimoi acted on hj aoetie aodL
24, 26. Acnnoj^nys ooulata ; 26 represents three individuals in the act of ooi^jugatiaB,
ti ea te d with acetic add. The contents of Ifwo have intermingled ; a laige vacuole with £wd-
partides lies between them. The individual on the other side is auni^ coherent (1-26^
Dtein.) 26, 27. Adneta finmun-equinum ; 27 shows the eso^ of m ciliated emfasyo.
The horseshoe-ehaped nudeus appears as a dear space. 28. Aotancmhrys SoL 28^ 30. A.
Bidihomii ; 30. A hijriily maynfied section to show the reticulatea struotore; 31, 32. A.
8ol : 31. In the act of self-division (conjugation ?) ; 32 shows three vesicular eipanaiflwa
eonoemed in the introduction of food, aiMl an eno^ated animalcule inat faroug^ to the
•urfiMe. 33-36. Podophrya fixa; 34. In act of fission; 36. Segment becoming oioe inde-
pendent and about to separate. 36, 37. Encysted Podophiyia. 38, 39. Staees of Podo-
phrya towards encysting. 40, 41. Aoinetss with embme. 42; 43. Traaaformation oC
the embryo into an Adneta, figured aa oomntendng in 43, and aa completed in 42.


Vi^^ares 274, 276. Laorymaria Proteus. 276, 277. LeaoophijB pa^ila. 278. L
Spathula. 279,280. L.Banguinea. 281. HdophryaOvnm. 282,283. Prarodon tens^
^4-286. Cdeps fairtus. 287, 2B7«, 288, 269. Trachdiua Anaa. 290. T. Ovmn.
291-293. LoxodeaBostrum. 294. Bursaria Vorticella. 296. B.leucas. 296. R Pupa.
296*. Spirostomum virens. 297, 298. S. ambi|[uum. 299. Phialina viiidia. dOO-
302. CHauooma sdntillans. 303-309. Chilod<m Cucullulus. 310,311. Kaasula eiinazH.
312, 313. Amphileptus Anser. 314-316. A. Fasdola. 317-319. Traehdooeroa &kr.
320. T. biceps.

PLATE XXV. (Pkwoioa).

FigarM 321-323. Aspidiaoadenticulata. 324-328. EolpodaCuouUua. 32^-332.
Paramedum Aurelia. 333. Uroleptus Musculus. 334, 336. Ophryog^ena aeuminaia.
336^ 337. O^^tridia gibba. 338. 339. Ceratidium ouneatum. 340, 341. Koona
polyporum. 342. UioetyUt grandis. 343, 344. Stylonydua lannenlata. 346^ 34a
DiMocephalus rotatorius. 347, 348. Himant(^>horus Charon. 349. Chlamidodon
Mnemosyne. 360-363. Euplotes Charon. 36^ 366. P^gora MeUoert». 366. Idi-

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Imlimn Podura. 367, 368. Ohietonotos Laros. 360| 360. CHenopbon Trodhot.
)61>364. ^kdstee cryBtalliniis. 365-370. Co&oohilQs YoIyoz.

PLATE XXVI. (Phytozoa).

The following^ figoree are deriyed from M. Bigardin's exoellait tareatise, * Histoiie dee
[nfii8oireB':~FignTe 1. Hexamita nodoloea. 2. Anthophyea MullerL 3,4. Aoineta
tiberoea ; in 4 the cilia included. 5. Heteromita ovata. 6. Cmmennla texta. 7. Polj-
idmia yiridis. 8. Anieonema sulcata. 9 a, b, Oxyrrlus irmi-ini^ 10 a, b. PloBotia Titrea.
LI. Heteronema marina 12 a, b. Zyzoeelmis nebulosa. 13. Peranema globulosa. 14.
I?yolldinm dietortum. 16. 0. ahecJHBuiii. 16 a, b, Aoomia Cjolidiam ; 6, eelf-diyiding. ^

PLATE XXV 11. (Protozoa).

Figoree 1-9. Vortioella microBtoma : 1. With a bud growing from its base ; 2. A
mecimen about to detach itself from its stalk, and baying a posterior wreath of cilia; 3. Self-
urision proceeding ; in 4 oompleto ; Sd^b^c^d. Enoysting-process ; 6 e. A ^st ruptured br
treasure, givins exit to the included Vorticella, apparently undianxed ; 6. Apposed transi-
aonal forms from rudimentary campanulate organisms to un<£)ubted YoHaoeUA ; 7-9.
Process of enojstinff , and progressiYe disappearance of special organs. 10-16. Vaginicola
aystallina: 10. Self-diyifflon ; U. One of the fission-products contracted and ready to
»oape by means of its posterior wreath ; 12-16. Actnetse formed from VaginicoIsK. 16-23.
Epistylis nutans : 16. Two individuals on a stem ; the ciliary appunttus protruded in one,
contracted in fbe other ; 17, 18. Supposed AcinetsD ; Adneta-boay of the Epistylis ; in 17
be wavy outUne indicates the contractions taking place in the integument ; in 18 the out-
rtretcbed ciliary fibres or processes^ two nuclei, and a large contractile resiole are risible ;
b9. Another such body, with its surface much contracted, and its contained subsUmce
rasted by the development of embryonic nuclei ; 20. Another figure assumed by the
Ldneta-body ; 21. The ultimately withered state arrived at by the Aoineta-body of an
Spistylis, after the exhaustion of its contained formatiTe blastema by the repeated produo-
ion of embryos ; 22^Z3. "Very young forms (probably) of the Epistylis nutens, and appa-
ently the £j[iis^lis BotaTtis of Ehrenberg.

PLATE XXVm. (Peotozoa).

Figures 1-3. Nassula ambigua: 1. Under surface; the two long articulated filaments
rithin are portions of Oscillatoiiie; c, vesiole; ,<^ nudeus; 2. Encysted specimen ; 3. Ani-
oaloale forced from its cyst by pressure. 4-7. Glaucoma scintilfans : 4. Under surface ;
K An eneysted being, seen in 6 undersoing transverse fission, which in 7 appears oblique,
mmg to a change of position of the resiuting segments. 8| 9. F^rodon teres : 9. Its nucleus
urmounted by a rim-like nucleolus. 10. Stylonychia MytUus. (1-10, Stein.) 11-16.
f assola elegans : in U internal germs occur in a cavity (uterine) communicating externally
ly a canal (oviduct) ; 12. Qerm loosing itself from Ibe parent ; 13. A fission-product
ndosing a germ ; 14. Germ developing Adnetiform tentades ; 16. Nudeus terminated
\t ito narrow end by a nudedus. IB. Stentor Miilieri, surrounded by an envelope with
nonads in its interior ; 17. Same, animal contracted in ito case. (11-17, Ck>hn). 18, 19.
Vaginicola valvata. The valve is seen dosed at 6 in fif . 18 ; fission has occurred botii in
liis and in 19, but the animal ii confiaoted in the rormer, and expanded in the latter
izami^ ; in 19 the valve appears as a streak paralld with one siae. 20-23. Ls^tia
dridis: 20. Head of a young indiridual ; 21. Lateral view of animal and of ito ciliated
lead ; 22. Tip of one of the lobes of ciliated head ; 23. Animal witii front view of head.
18-23, Wriji^t) 24-26. Otostoma: the oral carity is seen as an ear-shaped space; in26
wo Teaides also are seen opening externally. (Carter.) 27-30. Ooenomorpha Medusula.
II. Panophrys griseola. 32. Habrodon curvatus. 33, 34. Blepharisma hyalina. 36.
!)inetochilum margaritaoeum. 36. 37. Cydogramma rubens. 38, 39. Stichotrioha
ecunda. 40-42. Pt^dium ovulum; in 42. Act of fission. 43, 44. Sticbotricha
ecunda. 46. Colobidium pdluddum. 46,47. Mitopbora dubia. 48,49. Apionidium
nodestum. 60, 61. Lembadion btdlinum. 62-64. Basonidium remJgans. 66-67.
^pisthiotricha tenuis. 68-60. Megatricha partita. 61. Acropisthium mutabile. 62, 63.
^iagontherium tenue. (27-03, Party.) 64 a^k. Enchdys Farcimen, illustrating chanpre of
brm consequent on Ibe introduction of food. 66-71. Nassula viridis : 66. Natural torm,
X370; 66, 67. Cysts; 70, 69, 68^ 71. Devdopment of oyst-contento into monadiform
^erma, endoeed within saonilar theos, and at length discharged externally as in fl^. 71:

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xdOO (Cifliikowaky). 72,73. End^yi Pupa. 74-78. SMonjcfaia poitalate: 74. &
•niinalouleenoTitod, xdOO. 76^ 76. Boteting oelli within Uie cjtt», X220 (OdpkowriEy).



Fif;are 1. Vortioellm CkmiMmiila, Tiewed from the Tentnl uspetiL 2. CarcliMiiiB
oolypinum, riewed in front and direotlj upon the ciliated diic: t, the mouHi ; e; the anna.
8. Soyphidiia limadna. 4. Operookna berberina, seen from the back. 5^ 6. Chatosfna
Mullen : 6 r e pr eie n ti the animal in motion. 7. Stentor polymorpbaa, ehowing rwrnsallar
eanal around tne head and along one side. (1-7, Leohmann.) S-13. S. OBruieoi, and iti
aappoeed internal serms or embryos in different stagee of derelopment (Bckfaard). 1^ 1&
Tnchodina Pediomus : 14. A Uteral view ; 15. Anterior eztremitj. 16. T. mitea. 17.
T. Pedioulus, a dead, dirtended spedmeiL (14-17, Stem.) 18. Stylonjcfaia poetalata,
eno/Bted (Stein). 10, 20. Amphileptuji £Moiola: seen enojited in fig. 19, and aa eK^nd
from the oyst in flg. 20. 21-24. Oxjtricha Pellionella: 2L Encysled; 22. Cpt aded
upon b^ hvdroohlorio add ; 23. Animal reTived in iti ojit prior to its escape ; 24. The
free animal 26-34. Parameoinm (Loxodes, Cohn) Bursaria, its structure and develop-
meat : 26 to show circulation of contents ; 26. Portion of integument higfalj magnifiea ;
(19-2a, Cohn;) 27. Transrerse fission ; 28. Nudeoa seen at r, the nudeolua at tf ; 29.
Bmbryo attadied to the nucleus ; 30. Embryo escaped but still adherent by adnetifona
tentacles ; 31. Nucleus and attached nucleolus separated by acetic acid ; 3^ 33. Hodeiis
and nucleolus during fission of animal ; 34. Nucleus, nudeolus, and oommeocing embiyo.
36-47. KolpodaCucullus, illustrating its forms and derelopment : 37. Acted on by aleofaoi
lo bring its nucleus into Tiew; 38. An animal contracted into a spherical shape; 39. A
similar one undenoing fission ; 40. Encysted Kolpoda ; 41. Same, in act of fisiion ; 42.
Fisrion oompletea ; 43. Specimen treated with alcc^l ; 44. Cyst-oontents diridad into
four; (r^wall soft and irregular; 46. Bmbryo escaping from a cyst; 46. A rantored
cyst ffiring exit to encysted germs, as seen in 47. 48^-69. Chilodoo CuoaUului : 48i. The
so-culed dental cylinder ; c, nucleus and nucleolus ; 49. A specimen with a lane wpper
lip, equivalent to C. undnatus (Ehr.) ; 60. Transrerse, and 61. Lmuntudinal fisnon; 62.
Contracted prior to encysting ; ^3, 64. Cysts ; in 64 an embryo (UTek>ped ; 56. Appa-
rently laminated cyst discharging its contents ; 66, 67. An empty cyst, with the aperture
through which its contents have escaped remaining ; 68. A cyst containiiue a parent animal
and an embryo; 69. A liberated embfro, equiTalent to Cydidium Uisaooma (Ehr.).
(26-^, Stein.) ^ . , -

PLATE XXX. (PROTOSOA, after Stein).

FigtlTM 1-4. Oneroularia articukta: 2. A highly magnified Tiew of the hetti; 3, 4.
Supposed Adnetn of this species ; an embiyo shown in fig. 4. 6-8. Ophiydiiim niiwliki:
In 6 the animal is seen extended, and in 6 contracted ; 7. Encysted animal ; 8. Its sop-
nosed Acineta. 9, 10. Cardiesium polypinum : 10. A hi^y magnified Tiew of its stem.
11. Bpistylis crassicoUis. 12. Cothurnia curra. 13, 14. C. Sieboldii : 14. A side Tiew.
16, 16. C. Astad : 16. Animal contracted 17-26. Spiroohona gemmipara, and its devekp-
ment : 17 exhibits a gemma ; 18-20. PromssiTe derelopment of the spiral bead in a
gemma ; 21. Encysted gemma ; 22. Supposed Acineta (the Dendrocometes) in ita earl j st^ ;
23. As frilly deTeloped; 24. Embryo (seen in 23)set free; 26. A Dendxocometos* without
arms, but with a contained embir o ; 26. A fr<ee embryo rerolTing on its kmg axis. 27, 28.
Spiroohona Scheutenii ; 28. AiW the action of spirit of wine. 29-36. LMno^^mra
Yaginicola, its structure and deTclopment: In 29 a gemma is seen in the act ofttsion ; in
30 the animalcule has its rotatory apparatus retracted ; 31 shows the detachment of the
head of the animal from the mouth of its sheath, to allow escape of a eemma; 32. Act of
fission ; 33. Formation of a gemma at posterior extremity ; 34. Sererd senmMe enclosed;
36, 36. Act of fission ; complete in fig. 36, where the parent segment is detached from the
orifice of the sheath, leaTing a portion of its interior extremity. 37. Opercularia miero-
stoma: A, extended; b, contracted.

PLATE XXXI. (Pbotozoa).

Fi^fnres 1-4. Bursaria leucas, and the position and structure of the tridiocysts found
in its mteffument: 1. x90; 2. Diagram of the margin, to show pontion of triohocysts in
">?/onnd kyer ; 3. Trichocysts projected from the surface after the u>plioation of aoetie
acid ; 4. Detached spiral triohocyBts in the second stage of eyolution fimn elongated ofal
corpuscles (AUman). 6-6. Corethria SertuUriap : in 6 the two sorta of processes are boOi

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Been ; that in the right is the normal form ; 6. More magnified view of the'fuaiform procen,
showing ^e terminal depression or aperture. 7-13. £Eigotia produota, its structure and
derelopment : 7. Animal extended, in 8 contracted ; 9, 10, 11. Larra or embryo ; 10
represents it attached ; 12. Diagram of structure of the sheath, showing the ectoderm
(coU^oderm) at a, the ohitinous tube at b, and the endoderm tttc; d points out the mode
of oreirlapping of the several segments of tube ; 13. Highly magnified view of a portion of
tube. 14, 15. Zooteireardigata: 14. Animal expanded; 15. Contracted. (5-15, Wright.)
16-20. Peridinium uberrimum: 17. Seen on opposite side to that shown in 15; 18.
Tnmflrerse fission ; 19. Same specimen after the application of solution of iodine ; 20.
Nucleus isolated (Allman). 21, 22. P. depressum : 21. A side-, 22. A front-view. 23.
P. longipee. (16-23 after Bailey.) 24-27. J[)ysteria armata: 25. Parts of mouth ; 26, 27.
Process Detween two styles : 26. A front-, and 27 A side-view (Huxley). 28. Turbanella
hyab'na, dorsal view: <2, the muscular oesophagus; a, testis; / mature egff ; «, ovary
( X350). 29, 30. Ohectonotus maximus : 29. Dorsal view ( x350) ; 30. ALsteral view.
31. Ideal section of ISirbanella hyalina through the generative organs. (28^1, Schultse.)
32-39. Noctiluca militaris: (32. N. punctata, Busch: a, oral cavity or hilum; ^, sharp-
bordered rod ; c, nucleus ; d^ proboscis [cilium] ; /, brown corpuscles, after Busch ;)
33. Front view, a, the tooth; 6, oral aperture; c^ position of supposed anus (afW
Webb) ; 34. Dorsal view, showing the groove ; and 35. A latero-infenor view, displaying
the oral cavity with the tooth, d ; the cilium a gastric pouch, e ; and a presumed anal
aperture (Huxley) ; 36-39 (after Busch) : 36. A germ m process of development ; 37.
Brown granular body, seen at / in fig. 32 ; 38. A germ ; 39. Further advanced, acquiring
fche ohanicters of a Noctiluca.


Fiffures 371, 372. Microoodon Clavus. 373. Ojiphonautes oompreesus. 374-378.
Koealotrocha albo-flavicans. 379-382. Tubioolaria N^as. 383, 383*. Stephanooeros
Eicnhomii. 384, 385. Flosoularia omata. 386, 387. Melicerta ringens. 388-392.
Limnias C^ratophylli. 393. Enteroplea Hydatina. 394. Hydatina senta. 395^ 396.
Pleurotrooha gibba.


Ftg^nres 397, 398. Furoularia Beinhardtii. 399 & 417. Monooeroa Hoomit.
I00-4O2, & 426. Polvarthra platyptera. 403. Diglena lacustris. 404, 405. Dw
rrandis. 406-408. Tnarthra lonfiseta. 409. Rattulus lunaris. 410, 411. Distemma
?orficula. 412 & 414. Triophtluumus dorsaUs. 415. Bosphora NiHas. 416. Notonk-
nata Copeus. 418-420. N. Myrmeleo. 421. N. Tigris. 422. SynchsBta peotinata.
123, 42^. Scandium longicauda.

PLATE XXXrV. (Rotatoria).

Fignres 425 ^ 426. (>cloglena Lupus. 427-^429. Tbeorus vemalis. 430-433.
[icpadella ovalis. 434-4^. Monostyla quadridentata» 438-440. Mastigocerca carinata.
141-444. Euchlanis? triquetra. 445, 446. E. Lynoeu& 447-453. Salpina muoronata.
154-456. Dinocharis Pocillum. 457-459. Monura dulds. 460-462. Golurus deflexus.
^3-465. Metopidia Lepadella. 466, 467. Stephanope lamellaris. 468, 469. Squa-
Delia oblonga. 470-473. Callidina elegans.

PLATE XXXV. (Eotatoma).

Figure 474. Hydriaa comigera. 475. Typhlina viridis. 476-480. Botifer vul-
aris. 481-484. Actinnrus Neptunius. 485^ 486. Monolabis oonica. 487-489.
>hilodina aculeata. 490. P. roseola. 491-494. NoteuB quadricomis. 495-497.
Lnuroa Squamula. 498. A. stipitata. 499-501. Braohionus polyaoanthus. 502-504.
Herodina Patina. 506. P. dypeata.

PLATE XXXVI. (Botatowa).

Figure 1. Melioerta ringens, protruded and fully expanded, with the upper part of its
ibe at a ; b, one of the tactile tubes ; the circular disc at c is the pellet-cup ; at m are the
iws and gizsard (oesophageal head) ; and below, the stcHnach; c, a much less magnified

3 <i

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fpecimeii, partiallj m-otradad from its tube, whidi is here ahown entire, x30Q. 2. lim-
nias Cenitoph jUi : uie end is protruded beyond the imooth tube or Bheath ; at e if the
projecting chin. 3. Notommata aurita, yiewed laterally, contracted : it exhi^ta the obbo-
phageal head and jaws (6), the intestine, the large OTarium, the contractile sac bdow, the
grape-like ganslionio mass in the head(y), and the tortuous ressels on each side, numin£
the length of the body. 4. The same animal extended and rotating ; the ear-like dlisted
appendage, whence the specific name, is seen on each side of the bead. 4 a. The dlisted
lobes of the rotary organ ; 6, the gizaurd, with its jaws ; ^, the cerebral (?) mass ; k^ glands
abore the stomach ; o, large matured egg in the orary. 5. Notommat* aorita, Tiewsd
dorsally, the risoera omitt^ to show the muscular system ; the tnmsrerse musi^ sre
seen at ^ and the longitudinal, crossing them, at < ; the grape-like ganglkmie man
appears connected with special muscles, as also the gizsard, traced in dotted ootline, and
the telescopic-working tail or foot {h)\ the looped band at the head (o) indicates the
tubular cavities in the head-mass. 6. The same animal, showing dii^y its water-vascular
system ; the large sac near the bottom of its oarity (v) is the contractile bladder, firom
which proceed, on each side, convoluted tubes (tcNrtuous vesicles) furnished with tremulous
respiratory tags, as near a ; the transverse muscular bands seen at ^. 6 *. The dental
apparatus of the giszard as seen in action. 7, 8. The male of Asplanchna priodonta:
7. s. V. ; 8. f. T. The cavity is seen occupied chiefly by the large testes in fig. 7 ; the
sperm-duct is represented opening externally at the pointed bMe. 9. The female of
Asplanchna priodonta: at a are the gill-like fissures; a large oral cavity opeDS into a
narrow oesopoagus, which ends below in a stomach. One of the strong langitudinal
muscles is displayed, also tortuous vessels and ciliated tags, with an ovary. 10, IL The
jaws of the Asplimchna detached.

PLATE XXXVAL (Botatoria).

Figure 1. Stephanooeros Eichhomii: a, sheath; 6, pharynx; c, proventriculus, or
crop; dy maxillary head with jaws; e, stomach with large glandular cells; /, intestine or
rectum ; g, ovary with contained ova {a at pedicle ind^ates the longitudhial muscles in
that segment) ; tt, respiratory canal and tags. 2. Ovary and the enveloping membranoni
sac, or uterus, extending from it, containing ova in different stages of development : <x,
stroma of ovarv with inherent ova ; the darker segment probably indicates the position of a
winter ovum developing ; ^, ovum dividing ; c, ovum in which division of yelk has been
several times repeated ; d^ an ovum in which the rude outlines of the eoAnyo are distan-
guishable, the two eyes at <f, and the sac with the so-called urinary concretion at ir ; /
points to the uterine or ovarian enveloping membrane. 3. A very young Stephanooeros.
4. An>mbryo of Stephanoceros immediate^ after its exit from the shelL 5. An ovum of
Lacinularia. 6. Another ovum of the same, its yelk in process of fission. 7. A portion
of the ovary of the same, with four contained ova. 8. An ovum of the same, in which
division has been repeated several times. 9. Another ovum, wherein fianon has been
repeated until the yelk is broken up into a number of cells. 10. A young embryo of
Lacinularia immediately after its exit m>m the egg. 11. Another embryo, mrther develoned.

12. Termination of a tentacular process of Mdicerta ringens, showing the piston-like disc,
capable of retraction by a muscular band affixed to it, and surmountM by a brush of cilia.

13. A view of the same process, with the brush of cilia extended. 14. The same, with the
cilia retracted. IS. Ajn embryo of Melicerta ringens, whidi has attached itself and has
commenced the formation of its case or sheath. M. An embrro of the same animal as it
appears when swimming freelv. 17. Melicerta ringens, fiilly developed, with the lobes or
petals of ito ciliary wreath (a) fuDy expanded ; h, uncini ; c, ciliated process, representing
a fifth lobe; dd, tentaoula, as shown in figs. 12, 13, 14; e, jaws; ^, lower or second
stomach ; A, intestine ; k, coloured globules ; A suctorial end of pseudopodium ; m, musdes ;
92, ^land ; o, ovum. 18. Two muscular faisciculi, showing transverse maridnga. 19.
Lacmularia sodalis: a, pharynx; 6, maTillie, or jaws; c, muscular crop; d, stomadi;
e, lower segment of stomiaoh, terminating in a narrow rectum and anus at if; a, a ^Lan-
duUr (?) process ; A, ovary ; t, respiratory canal ; k, pedicle (Huxley). 20. Huxills of
Lacinularia sooialis. 21. Winter ovum in act of division. 22. Segmentation of a
portion of the ovary, of a difierent character from the rest, in prooess of forming a winter
ovum. 23. Maxilhe of Melicerta ringens, in bulb. 24. Wuter ovum of Lacinularia.
25. A portion of ovary of Notommata centrura : a, the homogeneous germinal spot ; 6, the
clear areola around it ; c, yelk-matter. 26. Maxilhe of Mi^oerta ringens. 27. Wmter oTum
of Asplanchna Sieboldii treated with solution of soda. 28. Winter ovum in its natural
state. 29. Male of Asplanchna Sieboldii, viewed firom the abdominal surfiMe: a a, the
anterior short arms ; 6 o, the posterior longer arms ; c, testis, or spermatic sac, filled with
apermatoioa; rf, wator-vascuUroanaL 30 a, 6, <?, <i, s, / The corpusda of the pi«oeding

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at e represent the earliest stage of the spermatio particles ; those at a the mature, including
the rod-Uke particles. 31. The maxillse of Asplanchna Sieboldii ; the striated muscular
bands moying them are very distinct 32. The female of Asplanchna Sieboldii: a,
pharjnx ; A, cells of stomach ; c, horseshoe-shaped ovary ; d^ sacciuar or uterine portion
of oTiduct, or ovarian sac, with contained mature ovum ; ^, contractile vesicle ; /, tags of
water- vascular canal ; ^, ditto ; y, muscular {?) cushion within dliarj wreath supporting

PLATE XXXVIII. (Rotatoria).

Figure 1. Botifer inflatus, body extended ; rotary apparatus withdrawn. 2. The
same Kotifer, with the horn-like appendages of its rotary apparatus expanded. 3. The
same Botifer, strongly contracted into a globular form. 4. Philodina erythrophthahna, in
a contracted condition, as found when dried. 5. Euchlanis triquetra, viewed on the under
side : a points to the lining membrane of the lorica in which the muscles are inserted ;
b, muscles ; (?, ganglionic enlargement ; dy respiratory tube ; «, areolar tissue of head ;
/, cesophagus, or tube between maxillary head and stomach. 6. Anurssa heptodon. 7.
Brachiouus rubens, the young just emerged from the shell. 8-10. B. Bakeri : 8. Ynnng
from the egg ; 9. Summer ^gg ; 10. Winter egg. 11. Notommata centrura, a portion^
the respiratory tube, with the ciliary tags within. 12. Termination of a tag, with the
cilium within. 13. A portion of a water-vascular canal, with ciliated tags of Asplimchna
Sieboldii. 14. Diagram of head of Brachionus polyacanthus, viewed from the mouth
side. 15. Diagram of head of the same, viewed from above. 16. A portion of the cerebral
ganglion and of the nerves proceeding from it, and the eye consisting of two portions.
17. Eye of Brachionus Bakeri, detached. 18. Eye of Euchlanis unisetata. 19. Eve of
Caligus. 20. Diagram of head (trochal disc) of Philodina. 21. Diagram of same, viewed
from the mouth side. 22. Battulus carinatus. 23, 24. Salpina spinigera. 25. Noteus
quadrioomis, dorsal view: a, maxilhe; c, anterior spinous cornu of lorica; cc, posterior
comu ; dj ovary ; /, vesicle of water- vascular system ; «, canal of ditto ; A, stomach ;
(, muscles. 26. Notommata centrura, dorsal view, surrounded by a mucous external
envelope, and lined by a subtegumentary lamina or dermis : by antenna ; c, glandular sac

Online LibraryAndrew PritchardA history of Infusoria, including the Desmidiaceæ and Diatomaceæ. British and foreign → online text (page 157 of 158)