270 ZOOLOGT. 



3. Leucophra. Animal ciliated on every part : size as the 

 last genus. 



6. Gonium. Animal simplej flat, angular : size as the last. 



7. Colpoda. Animal simple, pellucid, flat, sinuated : size 



as the last* 



8. Paramecium, ^wzmc/simple, pellucid, flattened, oblong: 



size as the last, 



9. Cyclidium. Animal orbicular or oval, simple, pellucid, 



flattened : size as the last. 



1 0. Bursaria. Animal simple, membraneous, hollow. 



11. Vibrio. Animal %vm^\ey round, elongated: invisible 

 without a Microscope. 



12. Enchelis. Animal simple, cylindrical : size as the last. 



13. Bacillaria. Body composed of cylindrical filaments, 



placed parallel to each other, and often changing their 

 position. 



14. Volvox, Animal simple, pellucid, spherical : invisible to 

 the naked pye. 



15. Monas. Animal of the most simple form, being a mere 



point, quite pellucid, and invisible without the aid of a 

 good Microscope. 



