Microscopical Essays. 633 

 Fig. 13 reprefents another fpecies, defcribed by Spall anzani. 



Fig. 46, 47, 48, 49, Plate XXVI. reprefent the wheel animals, 

 feen and delineated by Mr. Miiller. a the head, b the eyes, c a 

 fmall horn, d the rotatory organ, e the tail, f the points of the 

 tail. 



326. Vorticella Furcata. 



Vorticella cylindrica, apertura Integra, cauda longiufcula 

 bifida. Cylindrical vorticella, the aperture undivided, the tail 

 rather long, and divided into two parts. 



A cylindric body, with a rotatory organ, or row of hairs, at 

 the apex ; the tail divided into two parts, a little turning in- 

 wards. When at reft, it joins the fegments of the tail; but 

 when in motion, it feparates them. Generally found in common 

 water. 



327. Vorticella Catullus. Fig. 50, Plate XXVI. 



Vorticella cylindracca, apertura mutica, cauda per brevi, re* 

 flexa, bicufpi. Cylindrical vorticella, the aperture plain, the 

 tail fhort, bent back, and divided into two points. 



It is a little thick animalculum, mufcular, folding itfelf up, of 

 an equal breadth throughout, the body disfigured by longitudinal 

 folds, winding varioufly ; the anterior part, or head, connected 

 to the body by a little neck, it occasionally manifefts a very mi- 

 nute rotatory organ. The tail (e) is fhort, terminating in two 



4 H very 



