POLYGASTRIA. 



appendages, and with the body uniform, similar 

 to the monads, but provided with an external en- 

 velope or shell, and dividing by complete spon- 

 taneous fissure beneath the common envelope 

 into a number of animals which take the fonn 

 of a polypary. At length the envelope becomes 

 ruptured, and gives passage to the divided 

 animals, which in their turn renew the same 

 process of developement. 



Gyges. 



Pandorina 



Gonium, (7, 8, fig. 1.) 



Syncrvpta. 



Synura. 



Uroglena. 



Eudorina, (9, 10, fig. 1.) 



Chlamidomonas. 



Sphaerosira. 



Volvox, (fig. 3.) 



Family 4. VIBKIONID^E. Animals either 

 distinctly or most probably polygastric; fili- 

 form; without alimentary canal ; without shell 

 or external appendages; with the uniform body 

 of Monads; associated in filiform chains in 

 consequence of imperfect spontaneous (trans- 

 verse) division. 



Bacterium. 



Vibrio, (1, 2, 3, 4, 5, fig. 5) 



Spirochaeta. 



Spirillum. 



Spirodiscus. 



Family 5. CLOSTF.RINID.S. Animals dis- 

 tinctly or most probably polygastric, without 

 alimentary canal, and without external appen- 

 dages; body uniform, resembling the Crypto- 

 monadinidae in their envelope or shell, and 

 dividing, together with their envelope, by spon- 

 taneous, transverse fissure, into a bacilliform 

 or fusiform polypary ; provided with moveable 

 papillae situated in the aperture of the shell. 



Closterium, (6, 7, fig. 5 ) 

 family 6. ASTASIEAD& Animals evi- 

 dently or apparently polyastric, without ali- 

 mentary canal, without external appendages or 

 shell ; changing their form to caudate or ecau- 

 date at pleasure ; body with a single aperture. 



Astasia, (1, Jig. 6.) 



Amblyophis, (2, fig. 6.) 



Euglena, (3, fig- 6-} 



Chlorogonium, (4, fig. 6.) 



Colacium, (5, fig. 6.) 



Distigma. 



Family 7. DINOBRYINA. Animals dis- 

 tinctly or apparently po'ygastric ; without in- 

 testinal canal; body with a single aperture; 

 without external appendages; changing their 

 form at will, and invested with a shell. 



Epipyxis. 



Family 8. AMOEBAEAD* (Proteiform 

 Animalcules). Polygastric animalcules with- 

 out alimentary canal; body with a single 

 opening, furnished with variable processes, the 

 shape of which changes at will ; without a shell. 

 Amoeba, (7, 8, 9, 10, 11, 12, 13, fig. 6.) 

 Family 9. ARCELLINIDJE (Capsule Ani- 

 malcules). Animal pclygastric, anenterous, 

 loricated ; body multiform, furnished with 

 changeable foot-like appendages, covered with 

 a univalve urceolate or scutellate shell, with a 



single aperture. = Amoeba enclosed in an 

 urceolate or scutellate shell. 



Difflugia, (I, fig. 7.) 



Arcella, (2, fig. 7.) 



Cyphidium, (3, fig. 7.) 

 Family 11. CYCLIDINID* (Disk Ani- 

 malcules^). Animals polygastric, anenterous, 

 provided with appendages in the form of cilia 

 or seUe ; destitute of shell. 



Cyclidium. 



Pantotrichum. 



Chaetomonas. 



Family 12. PERIDINAEADJE ( Wreath 

 Animalcules). Animals visibly or probably 

 polygastric, anenterous, loricated, vibrating ; 

 having setae and cilia dispersed over the body 

 or shell often in the form of a zone or crown ; 

 shell with a single opening. 



Chaetotyphla. 



Chaetoglena. 



Peridinium. 



Glenodinium. 



Family 13. VoRTrcELLiNin.t (Bell 

 Animalcule). Animals polygastric, having a 

 distinct intestinal tube, with two openings, the 

 oral and anal apertures being distinct, but 

 situated in a depression common to both ; 

 without shell; either solitary and free, or fixed 

 and frequently associated, developing them- 

 selves by imperfect spontaneous division, and 

 frequently assuming the form of beautiful little 

 bunches. 



Stentor, (fig. 8.) 



Trichodina. 



Urocentrum. 



Vorticella, (fig. 9.) 



Carchesium. 



Epistylis. 



Opercularia. 



Zoothamnium. 



Fa inily 14. OPHRYDINIDJE (Loricated 

 Betl Animalcules). Polygastric animalcules, 

 having a distinct intestinal tube, the apertures 

 of the mouth and anus being distinct, although 

 situated in the same fossa ; loricated; solitary 

 or aggregated. (= Vorticellina loricata.) 



Ophrydium, (Jig. 10.) 



Tintinnus. 



Vaginicola, (9, fig. 11.) 



Cothurnia. 



Family 15. ENCHELIAD.E (Rolling 

 Animalcules). Animals polygastric; having 

 a distinct intestinal canal, the apertures of the 

 mouth and anus being situated at the opposite 

 extremities of the longitudinal axis of the body; 

 without a shell. 



Enchelis, (1,2,3,4,5, fig. 1 1 .) 



Disoma, (6, 7, fig. 11.) 



Actinophrys. 



Trichodiscus. 



Pbdophrya. 



Trichoda. 



Lnchrymaria, (8, fig. 11.) 



Leucophrys, (I, jig. 12.) 



Holophrya. 



Prorodon (2, fiif. 12.) 



Family 16. Coi.EPFNin* (Box Ani- 

 malcules). Polygastric animalcules, having a 

 distinct intestinal canal, the mouth and anus 



