280 DESCRIPTION OF [Poly gastric a. 



indigo numerous digestive cells become filled. Found in 

 bog water. Size l-280th to l-240th. 



432. Enchelys nebulosa (M.) The nebulous Enchelys 

 has an ovate hyaline body, with a projecting mouth. 

 This species receives carmine and indigo very readily. 

 Ehrenberg has counted as many as nineteen digestive cells 

 filled with the coloured food. Size l-230th to 1 -570th. 



Genus C. Disoma (?) The double-bodied Animalcules. — 

 This curious genus is characterized by the presence of a 

 double body, destitute of cilia; that part at which the 

 mouth is situated is truncated (direct). The mouth is 

 ciliated, but devoid of teeth. Within the bodies numerous 

 little vesicular cells (stomachs) are observed, and the dis- 

 charge of excrement may be seen to take place at the 

 posterior extremity of each body. 



433. Disoma vacillans. The vacillating Disoma has 

 binary corpuscles, filiform and slenderly club-shaped; 

 it is hyaline and attenuated at the anterior extremity. 

 Ehrenberg remarks, "Both bodies frequently swam parallel 

 beside each other, so that they turned on their long axis 

 and moved onwards quickly, though vacillating; some- 

 times both bodies gaped widely apart from each other, but 

 never so widely as to form a straight line. (See j^g. 265*.) 

 Found on Mount Sinai. Size l-380th. 



Genus CI. Actinophrys. The sun Animalcules. — 

 Enchelian Infusoria, of a globular shape, covered with 

 setaceous tentacula, but W'ithout vibratile cilii. The part 

 at which the mouth is situated is truncated (direct). 

 The progress of the discovery of the organization of this 

 genus is as follows: — In 1773 the mouth was indistinctly 

 observed; in 1783 both the mouth and reception of 



