128 NATURAL HISTORY 



hooks are seen on one side, and a large aperture near the 

 posterior extremity. It propagates either by a trans- 

 verse or longitudinal division. 



263. Trichoda forceps. — This curious animalcule, 

 shewn at figure 153, has the upper part of the body pro- 

 duced into two long ciliated lobes, one pointed, the other 

 obtuse ; these the creature can open or close at pleasure, 

 like a pair of forceps, or cross them, as shewn in the 

 drawing. Found among lemna. 



264. Trichoda for/ex. — This is larger than the last, 

 and, like it, furnished with forceps : one side is very 

 short, and the other ciliated : two small protuberances 

 are observed at the lower extremity. I am inclined to 

 think it is some other species undergoing division. 



265. Trichoda index, — This animalcule was found in 

 salt-water : figure 144 gives a magnified view of its 

 form and the disposition of the cilia. 



266. Trichoda S. — Striated animalcule : the fore- 

 part ciliated ; the extremities curved in opposite direc- 

 tions, like the letter S. 



267* Trichoda navicula. Three-sided animalcule, like 

 an isosceles triangle : the mouth is situated at the base, 

 and ciliated : the apex of the triangle is bent : it is 

 convex on the under side, with a longitudinal line. 

 Found in salt-water. 



268. Trichoda succisa. Flattened oval animalcule: 

 the edges ciliated, except at the curved hollow near the 

 posterior extremity. Found among lemna, 



269. Trichoda sulcata is shewn, magnified, at figure 



