Microscopical Essays, 



595 



250. Trichoda Pellionella. 



Trichoda cylindracea, antice crinita, poftice fetofa. Cylindri- 

 cal, the fore-part hairy, the hinder-part furnifhed with bridles. 



This trichoda is rather thick in the middle, pellucid, with a 

 few molecules here and there, the fides obtufe, the fore-part 

 ciliated, the hairs very fine, the Hind-part terminating in a kind 

 of briftles. 



251. Trichoda Cyllidium. Fig. 15, Plate XXVI. 



Trichoda ovata, apice hiante, bafique crinita. Egg-fhaped, 

 the apex gaping, the bafe hairy. 



Pellucid, replete with globules of different fizes, in the hind- 

 extremity ; the fore-part narrower, without any footfteps of an 

 external organ. It vacillates upon the edge, commonly ad- 

 vancing on it's flat fide, continually drawing up water ; it then 

 gapes, opens into a very acute angle, almoft to the middle of the 

 body. It is difficult to be perceived, as it effecls this in an 

 inftant. a the mouth, b the hairs or bridles^ which it extends 

 when in agonies. 



252. Trichoda Curfor. 



Trichoda ovata, antice crinita, poftice duplici pilorum ftriclo- 

 rum & curvorum fafciculo. Oval trichoda, the fore-part hairy, 



4 C 2 the 



