636' Microscopical Essays. 



The head is full of molecules, round, and every-where of an 

 equal fize ; very pellucid 3 both fides of the orifice are ciliated, 

 and each has a rotatory motion, appearing fometimes without 

 the edge of the mouth, as at a a ; fometimes within it. No 

 diftincT: interlines, or internal motion, perceivable. It's motion i& 

 different from moft of this genus, but not eafily defcribed. c c 

 fmall feet. It is found in ftagnant water. 



334. Vorticella Piriformis. 



Vorticella fimplex, obovata, pedicello minimo retraftili. 

 Simple, fomewhat oval, with a very fmall retra&ile foot, or one 

 which it can draw within itfeif. 



335. Vorticella Tuberofa. 



Vorticella fimplex, turbinata, apice bituberculata. 



Simple vorticella, the upper part broad, the under part fmall, 

 with two projecting parts at the anterior end, which are furnimed 

 with a number of vibrating fibrillae, that produce a current of 

 water by their quick motion, and thus colleol: food for our vorti- 

 cella. Mr. Baker has delineated it in Fig. io, 11, 12, Plate XIII. 

 of his Employment for the Microfcope. 



/ 



336. Vor- 



