Cyclidina.'l infusorial animalcules. 511 



Familt.— CYCLIDINA. 



The Inl'usoria of this small family ai'c polygastric, devoid of true 

 alimentary canal, and have but one opening. They have no lorica ; 

 their bodies arc funiislicd with cilia or bristles, which perform the 

 function of locomotion, and the various groupings and relations of 

 these, afford characters for the discrimination of the genera ; a dis- 

 tinct proboscis has been seen. The system of nutrition has been 

 distinctly observed in two species of OycUdium ; ova have been seen 

 only in Pantotrichum Enchelys. No visual organs have been observed. 



The genera are distributed as follows : — 



f Body compressed— cilia arranged in a ( r,-nH,n,„« 



I single circle \ ^-Jcluuum. 



Body furnished with cilia ) 



Body round^cilia scattered all over Pantotrichum. 



Body furnished with bristles Chactoinonas. 



This family Cyclidina has no corresponding one in the system of 

 Dujardin. Some of its members are represented in the family of 

 the Encheliens of that author, among the examples of the genera 

 Acomia and Enchelys. 



On the other hand, the genus CycUdium (Duj.), is included in his 

 family Monadina (page 133), and, consequently, is made to include 

 beings furnished with a filament (proboscis), but destitute of mouth 

 and cilia — characters not at all analogous to those given by Ehren- 

 berg to his genus of this name 



Genus Cyclidium. — The disc Animalcules have a compressed body, 

 provided with cilia, placed in a simple circular row. In C. glaucoma, 

 the polygastric apparatus (stomach-cells) is distinct. The mouth is 

 a roundish opening, situated upon the under surface of the body, 

 either close at the anterior exti'emity, or towards the centre. The 

 organs of locomotion are neither proboscides nor oral cilia, but con- 

 sist, as in Kerona and Stylonychia, of a nimiber of cilia-like feet, 

 situated on the margin of the abdomen. Lately it has been thought 

 that longitudinal lines, produced by rows of very delicate cilia, were 

 present ; if so, and an anal opeuiag be discovered, C. glaucoma would 



