124 NATURAL HISTORY 



be distinguished a bright serpentine line. Found in sea- 

 water. 



238. Trichoda bomba. — This is a globular animalcule, 

 with cilia around the mouth, like the 7\ grandinella, 

 figure 135 ; but the body varies in form ; sometimes it is 

 elongated like a pear, with the end bent ; at others, it in- 

 creases in width, and appears uniform, while occasion- 

 ally it is observed spirally convoluted : it swims with 

 great celerity^ and is with difficulty followed under the 

 microscope. Found among healthy duck-weed. 



239. Trichoda orbis. — This is larger than the last, 

 more transparent, and of a globular form, with one side 

 indented, and furnished with a cluster of long cilia. 

 Found in clear river-water. 



240. Trichoda iirnula. The 'pitcher -shaped Trichoda, — 

 This is a large membraneous animalcule : the body rather 

 long ; the posterior enlarged ; the anterior truncated ; 

 and its edge surrounded with short cilia. Its motion is 

 slow. 



241. Trichoda diota, shewn at figure 140, is named 

 from its supposed resemblance to a drinking vessel with 

 two ears. It is probable that the entire edge is fur- 

 nished with cilia, like the Vorticella convallaria, but from 

 the minuteness, transparency, and velocity, they have 

 not been discerned. 



242. Trichoda horrida. — Egg-shaped, with the mouth 

 placed at the larger end ; the body is covered with long 

 cilia, deflected towards the posterior. Found in the 

 muscle. 



