Microscopical Essays. 



609 



adjacent water, very fhort hairs, which are probably the caufe 

 thereof, may be perceived. 



285.. Vorticella CinBa. Fig. 30, Plate XXVI. 



Vorticella trapeziformis, nigro-viridis> opaca. This vorticella 

 is in the form of a trapezium, of a blackifli green colour, and 

 opake. 



It is of an irregular figure, invihble to the naked eye, ciliated 

 on every fide, the hairs all moveable^ and longer on one fide 

 than on the other. It fometimes aflumes an oval fhape, and ap- 

 pears girt round with a tranfverfal keek 



286. Vorticella Lunifera. 



Vorticella viridis, poftice lunata, medio margine mucronato. 

 Green vorticella, the hinder-part lunated, with a point in the 

 middle, projecting from the edge. 



The fore-part obtufe, the bafe broad, and hollowed away like 

 a crefcent, with a protuberance in the middle of the concave 

 part, fhorter than the horns or points of the crefcent ; the fore- 

 part is ciliated., It is found in felt water* 



287. Vor~ 



