INFUSORIA. 57 



covered with small cilia, besides a coronet of large* cilia, free or 

 temporarily sessile. 



Stentor Muelleri EHRENB., Hydra stentoria L., ROESEL Ins. m. Suppl. Tab. 

 xciv. figs. 7, 8, MUELL. Infus. Tab. XLIII. figs. 6-12, EHRENB. Infusionsth. 

 Tab. xxiir. fig. I, DUJARD. Infus. Tab. xv. fig. I ; 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), DUJARD. (Trichodina EHRENB.) 

 Body globose or urceolate, not ciliated throughout. 



Urceolaria stellina, Trichodina pediculus EHRENB., Cyclidium pediculus MUELL. 

 and Vorticella stellina and discina ejusd., MUELL. Infus. Tab. xxxviu. figs. 

 3-5, EHRENB. Infus. Tab. xxiv. fig. rv. 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) l : in swimming it 

 rotates rapidly. 



Urocentrum NITZSCH, EHRENB. 



B. Loricated, or contained in a gelatinous envelope. 



Oplirydium EHRENB. ( Ophrydia BORY in part.) Aggregated 

 animalcules, contained in a common gelatinous body (infusora- 

 rium ?) 2 . 



Sp. Ophrydium versatile EHRENB., Infus. Tab. xxx. fig. i. Green globular 

 masses of \ 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 Ascidice) 

 alluded to above, derives confirmation from this form also. 



Vaginicola LAM. (in part) EHRENB. Animal solitary with ur- 

 ceolar lorica, body and lorica sessile. 



Sp. Vaginicola crystallina EHRENB., Infus. Tab. xxx. fig. v., DUJARD. 

 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. e. 175.] 



2 [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.] 



