Cri/ptomonadina.'\ infusokial axtmalcttles. 143 



Tliceamonadma with a single filament, and with a lorica neither hard 

 nor brittle, and whose body is not depressed like that of Phacus or of 

 Crumenula, and I moreover do not doubt that when these Infusoria 

 are better known, other genera may be distinguished by their more 

 or less globular form, by the consistence of theii- envelope, and espe- 

 cially by their mode of existence. I already indicate as subgenera, 

 Lagenella with an elongated lorica, and Tetrabcena, which live in 

 groups of four, without, however, being imited vdthin a common 

 envelope. As to the character supplied by the existence of a red 

 speck in some indiAdduals, assumed by Ehrenberg to be an eye, I 

 cannot discover in it a generic distinction, nor am I able to recognize 

 a lorica open on one side (below) like a shield. On the contrary, I 

 have always observed the lorica to be closed and entire, though 

 sometimes compressed on one side, adapting itself to the Kving mass 

 enclosed. The covering in every case is e\'idently larger than the 

 contained mass, a diaphanous space intervening between the two 

 aj^pearing Kke a ring." 



Crtptomonas curvata. — Porm compressed, slightly bent like the 

 letter S, and twice as long as it is broad; coloiu' green. Found 

 amongst ConfervsB. Size 1 -570th. 



C. ovata {Enchelys viridis, M.) Form depressed, oval, and twice 

 as long as broad ; colour green. Motion slow, vacillating, and 

 rotating on the longitudinal axis : but when obstructed, the creature 

 is seen to leap. Lorica paper-like, not hard, and the numerous in- 

 ternal transparent vesicles perceived amongst the green ova are the 

 alimentary sacs. In the middle of the creature there are two or 

 three egg-shaped bodies, supposed to be seminal glands, and at the 

 posterior part a single variable vesicle of a sexual nature ; self- 

 division not observed. Figures 21 and 22 represent two full grown 

 creatures (side and back view), magnified 300 diameters ; and fig. 23, 

 a young one. Foimd amongst confervas. Size 1-5 70th. 



C. erosa. Body depressed oval, colour green, anterior part hyaline. 

 Found in clean water, among confervae. Size 1 -960th. 



C. cylind/rica {JEnchelys viridis, M.) Body elongated, sub-cylindrical, 

 three times as long as broad. Found amongst confervas. Size 

 almost 1-lOOOth. 



Ceypxomoxas (?) glauca. Form oval, twice as long as broad, an- 



