Kolpodea.'\ the INFUSORIA. 315 



active and (stiff). In swimming the body revolves. Found 

 with oscillatoria. Size l-220th. 



528. Uroleptus hospes. The stranger or guest Uro- 

 leptus. — Body greenish, ovato-oblong, and turbinate in 

 shape, anterior obliquely truncated and excavated; the 

 posterior terminated by a styliform acute tail. Found in 

 the cells of frog and snail spawn. Size 1 -240th. 



g29. Uroleptus (?) lamella. — Body transparent, linear, 

 lanceolate, depressed, flat, very thin. Found in infusions. 

 Size 1 -220th. 



5.30. Uroleptus Jilum {Enchelys caudafa, M.) The 

 thread Uroleptus. — Body white, filiform, cylindrical, 

 rounded anteriorly, attenuated posteriorly, forming a 

 straight long tail. Found in stagnant spring water, &c. 

 Size l-48th. 



Genus CXXIV. Ophryoglena derives its name from 

 the animalcules possessing an eye anteriorly, and having a 

 ciliated body. Locomotion is effected by numerous longi- 

 tudinal series of cilii. Their numerous digestive cells are 

 often filled with Naviculae, and in one species this structure 

 has been demonstrated by indigo. The mouth is situated 

 in a cavity beneath the brow, and the discharging orifice 

 upon the dorsal surface, at the base of their little tail. The 

 ova granules are brown in one species, black in another, 

 and yellow in the third. A large central gland exists in 

 one species, and contractile sexual vesicles in the others ; 

 transverse and longitudinal self-division has been obsei-ved 

 in one species. A system of sensation is indicated by the 

 presence of a large red or black visual organ, always present 

 on the frontal region. 



