OF ANIMALCULES. 83 



135. Cyclibium ^idtans. — This is a bright animalcule, 

 slightly oval, and surrounded by a margin of a blue 

 colour. It is very small, requiring a magnifying power 

 of 400 at least to examine it. 



136. Cyclidium nigricans. — This is a very small, 

 pellucid, flat, elliptical animalcule, with a dark margin ; 

 and under a low magnifier resembles an Enchelis. 



137. Cyclidium rostratium. The pointed Cyclidium. 

 — This species is of an oval figure, with its anterior ex- 

 tremity pointed ; it is restless, and constantly in search 

 of food ; the interior sometimes exhibits a series of dark 

 sacs; at others, faint traces of lines may be discovered. 



138. Cyclidium nucleus. This oval Cyclidium has 

 the posterior acute, resembling grape-seed. It is about 

 twice the size of the C. nigricans. Scarce. (See figure 62.) 



139. Cyclidium Jiyalinum. The glass-like Cyclidium. 

 — This is a very small diaphanous animalcule, like the 

 young of the C. nigricans. 



140. Cyclidium pediculus. — This is a parasitical 

 animalcule, infecting the polype : it is white, with the 

 extremities depressed and truncated; sometimes one 

 extremity appears divided, which is most probably the 

 mouth. 



141. Cyclidium dubium. — This animalcule is exhibited 

 magnified, in two positions, at figures 63 and 64 ; the 

 upper surface is convex, and the under concave. It is 

 found among lemna. 



