OF ANIMALCULES. 137 



usually has the tail deflected, as shewn in the drawing. 

 (See Book III.) 



317. TRicHODA/2g'n5. — The Striped Trichoda resembles 

 the preceding, but the head is convex, and there is a 

 slight contraction or neck : the body is terminated by 

 two long bent setaceous tails. 



318. Trichoda pocillum {Dinocharis, E.) — The little 

 cup-shaped Trichoda is shewn, magnified, at figure I7I : 

 it is a highly-organized creature, and the muscular struc- 

 ture of the body can be clearly observed. 



319. Trichoda cornuta [Monostyla cornuta, {?) E.) — The 

 horned Trichoda is shewn at figure 173. The head of this 

 animalcule can be withdrawn at pleasure, when the con- 

 cave end of the shell can be more distinctly seen. 

 Length, l-140th of an inch. 



320. Trichoda longicauda {Scaridium, E.) — 3 lo ng- 

 tailed Trichoda is a very interesting animalcule, and under 

 a good instrument a considerable portion of its highly- 

 organized interior may be perceived. I have given a 

 sketch of it at fig. 177' The head and body can be con- 

 tracted at the pleasure of the animalcule. 



