OF ANIMALCULES. 129 



145 : it has two rows of cilia ; the mouth is situated 

 near the acute end : it is often seen with a number of 

 dark spots ; and when viewed sideways, only one row 

 of cilia can be observed. Found in the common muscle. 



270. Trichoda anas (Trachelius anas, E.) The duck 

 Trichoda is distinguished from the Vibrio fasciola (114) , 

 in being convex on the under side, while the latter is 

 flat. The organization of the two species strongly re- 

 sembles each other : I have therefore placed the drawings 

 in juxtaposition : figures 166, 167, 168, and I7O, repre- 

 senting the fasciola, and figures 164, 165, and 169, the 

 duck Trichoda. Their bodies are covered with rows of 

 cilia, and their mouths situated on the under side of the 

 neck, as shewn by the cross. When fed with coloured 

 substances, some of the larger sacs remain pellucid, 

 as filled with water. Length, 1 -120th of an inch. 



271. Trichoda barbata is probably the young of the 

 E. pupa, figure 37 : the anterior extremity is smallest, 

 and ciliated on one side. 



272. Tricuob A far cimen is shewn, magnified, at figures 

 146 and 147- 



273. Trichoda crinita is like figure 168. 



274. Trichoda angulus. — This animalcule is long, and 

 bent near the middle, forming an angle. I am disposed 

 to think it is about to divide, and therefore mistaken by 

 MuUer for a distinct species : the anterior is ciliated. 



275. Trichoda lenter. — Egg-shaped animalcule, with 

 one end ciliated, and the body slightly curved. Found 

 in an infusion of grass. 



276. Trichoda vermicularis* — This creature is shewn 



