Microscopical Essays. 



621 



a globular projection may at times be feen to proceed from the 

 aperture. 



317. Vorticella Succolata. Fig. 42 and 43, Plate XXVL 



Vorticella inverfe conica, apertura lunata, trunco poftice bi- 

 dentato, cauda elongata biphylla. This vorticella is in figure 

 an inverted cone, the aperture of a crefcent fhape, the lower 

 part of the trunk is notched, forming, as it were two teeth, the 

 tail biphyllous. 



Each of thefe parts is furrounded with a loofe bright fkiri, the 

 head is divided from the trunk by a deep incifion. a a a fmall 

 points projecting from the head, b the cilia, c and d the interior 

 parts ; J, Fig. 42, the little horn at the bottom of the trunk. 



318. Vorticella Aurita. 



Vorticella cylindrico-ventrofa, apertura mutica, ciliis utrinque 

 rotantibus cauda, articuiata biphylla. Cylindrical ventrofe vorti- 

 cella, the aperture deliitute of hairs, both fides of it furnilhed 

 with rotatory cilia, the tail biphyllous. 



319. Vorticella Tremula. 



Vorticella inverfe conica, apertura lobata fpinulofa, cauda 

 brevi unicufpi. This vorticella is fomewhat of a conical fhape, 

 the mouth divided into parts which are fet with fmall fpines or 

 thorns, a point projects from the tail. 



