ABSTRACT OF THE INFUSIONSTHIKRCHEN OF EHRENBERG. 153 



The members of this genus are well characterised by the oblique 

 position of the oral aperture with respect to the longitudinal axis of 

 the body, and by the presence of the protuberant lip. The creatures 

 move in the direction of the longitudinal axis of the body. 



Three species are known : two are devoid of colour, and the remain- 

 ing one is of a pale yellow hue. 



Genus BODO. 



Eye and projecting lip not present ; tail present ; mouth terminal ; 

 spontaneous self-division simple, perfect, and bipartite, or none. 



The presence of a caudal appendage sufficiently characterises the 

 species of the present genus. It may be remarked, however, that the 

 solitary individuals sometimes cluster voluntarily, forming mulberry or 

 grape-like masses. 



Eight species are known : one is of a green colour, the rest are 

 colourless.* 



Bodo socialis is one of the Infusoria most frequently met with in 

 stagnant spring water, and vegetable infusions. Three other species 

 are parasites. 



FAMILY \\.-CRYPTOMONADINA. 



Poly gastric animalcules provided with a hard or soft lorica, and in 

 other respects possessing all the characters of MONADINA, or, at least, 

 not possessing any of the characters of other tribes of Infusoria : spon- 

 taneous self- division simple, perfect, or none. 



All self-moving, free, and minute mi- 

 croscopic organisms, possessing the 

 characters of the tribe MONADINA, or 

 not presenting those of any other fa- 

 mily, and not enclosed in a general or 

 common envelope, but in consequence 

 of their self- division being perfect, or 

 absent altogether, are free and solitary, 

 and separately enclosed in a special ge- 

 latinous, membraneous, or hardened 

 lorica, belong to the family CRYPTO - 



Prorocentrum. 

 MONADINA. 



