INFUSORIA. 57 
covered with small cilia, besides a coronet of larger cilia, free or 
temporarily sessile. 
Stentor Muelleri EHRENB., Hydra stentoria L., RoEse Ins. 111. Suppl. Tab. 
xcly. figs. 7, 8, MuELL. /nfus. Tab. xii. figs. 6-12, EHRENB. Infusionsth. 
Tab. xxi. fig. 1, Dusarp. Jnfus. Tab. xv. fig. 1; on the under surface 
of Lemna. When swimming the animal has an oval form, and moves in 
serpentine and differently curved lines ; when at rest or attached, it has an 
extended trumpet-like form. 
Urceolaria Lam. (in part), Dusarp. (Trichodina EnRENB.) 
Body globose or urceolate, not ciliated throughout. 
Urceolaria stellina, Trichodina pediculus EHRENB., Cyclidium pediculus MUELL. 
and Vorticella stellina and discina ejusd., Mur.. Jnfus. Tab. Xxxviu. figs. 
3-5, EnRENB. Infus. Tab. xxiv. fig. Iv. The animalcule creeps on fresh- 
water polyps and other bodies by means of moveable hooks on the dorsal 
surface (or on the extremity opposite to the opening)!; in swimming it 
rotates rapidly. 
Urocentrum NirzscH, EHRENB. 
B. Loricated, or contained in a gelatinous envelope. 
Ophrydium EnRENB. (Ophrydia Bory in part.) Aggregated 
animalcules, contained in a common gelatinous body (infusora- 
rium ?)*. 
Sp. Ophrydium versatile Enruns., Infus. Tab. xxx. fig. 1. Green globular 
masses of 3—5 inch. in diameter, forming as it were the infusory-stock or 
hive of an animal which MUELLER first described and figured as Vorticella 
versatilis. Earlier and later authors have taken this Polypary for a species 
of plant, and have described and figured it under the name of Ulva pruni- 
formis, Fucus subglobosus, Coccochloris stagnina, &c. The analogy of 
the Vorticellines with the Bryozoa and Molluscs (compound Ascidie) 
alluded to above, derives confirmation from this form also. 
Vaginicola LAM. (in part) Exrens. Animal solitary with ur- 
ceolar lorica, body and lorica sessile. 
Sp. Vaginicola crystallina EuREnsB., Infus. Tab. xxx. fig. v., Dusarp. 
Infus. Tab. 16 bis, fig. 6; formerly observed by LEEUWENHOECK ; they 
propagate by longitudinal fission within the transparent sheath. 
1 [For an elaborate description see Stein. Die Infus. s. 175.] 
+ (The gelatinous infusory-stock or hive is a product of secretion from the base of 
the body of each animalcule, and so is the homologue of the pedicels in Vorticellines. 
Vide STEIN. op. cit. p. 246.] 
