Microscopical Essays. 



a little lamina, or triangular point ; another of thefe is difcovered 

 .when the aperture faces the oblerver, which makes it appear like 

 a finall flower. The hind-part, when in motion, is a little bent ; 

 it terminates in two minute briftles, which are feen fometimes uni- 

 ted, at other times diverging. When the animalculum Is fwim- 

 ming, it's rotatory organ (a) may be feen ; molecular interlines 

 are vifible ; it moves with velocity in an oblique direction. Is 

 found in pure water. 



322. Vorticella Conftricla. 



Vorticella elliptico ventricofa, apertura Integra, cauda annu- 

 late hiphylla. Elliptical ventricofe vorticella, the aperture or 

 mouth undivided, the tail annul ated and forked. 



In this kind, the head, the tail, and the trunk, are fully dif- 

 tinguimed. A jubilance in motion has been perceived, which 

 has been fuppdfed to be the heart; there are two kinds of them, 

 one a pale yellow, the other of a white colour ; they move by 

 fixing their tail to the glafs upon the 11 age, and then extending 

 their body as much as poffible ; they fix the fore-part to the 

 place where they intend to move, and then draw the hinderrpart 

 to it, and fo on. They fometimes turn round about upon one of 

 the points of their tail, others fpring forwards with a jerk. When 

 at reft, they open their mouths very wide, the lips are ciliated, 

 two black globules are difcovered in fome of them. 



323. Vor. 



