240 DESCRIPTION OK [Pohj(jastrica. 



Family XI.— CYCLIDINA. 



The Infusoria of this small family are polygastric, devoid 

 of true alimentary canal, and have but one opening to the 

 body. They have no lorica, their bodies are furnished 

 with cilia or bristles, which perform the function of loco- 

 motion, and the various groupings and relations of these 

 aiFord characters for the discrimination of the genera; a 

 distinct proboscis has been seen. The system of nutri- 

 tion has been distinctly observed in two species of the 

 Cyclidium ; ova has only been seen in Pantotrichum 

 enchelys. No visual organs have been observed. 



The genera are distributed as follows : — 



/Body comi)i-esed— cilii arranged in a 1 r.„„T:jj,,„, 



single circle / >--J'»'""J"'"' 



Body furnished with cilii -j 



I Body round — cilii scattered all over .... Pantotrichmn. 



Body furnished with bristles Chaetomouas. 



Genus LXXX. 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 extremity, or towards the 

 centre. The organs of locomotion are neither probos- 

 cides nor mouth cilii, but are, as in Kerona and Stylony- 

 chia, a number of cilii-like feet, situated on the margin of 

 the abdomen. Lately it has been thought that longi- 

 tudinal lines, produced by rows of very delicate cilii, 

 were present; if so, and an anal opening l)e discovered. 



