OF ANIMALCULES. 159 



not appear to differ materially from the V. umbellaria, 

 except that the present species is distinct, and not con- 

 nected to a common stem. Figure 232 shews it mag- 

 nified, both as contracted and elongated. They are com- 

 monly found on larvae and entomostratia. 



383. VoRTicELLA cyatMncL. — This animalcule is shewn 

 swimming freely at figure 231 : the edge of the bell is 

 ciliated, though not exhibited in the sketch : it can at- 

 tach itself by the stem, which it contracts spirally. 



384. VoRTicELLA putvina. — This animalcule, shewn, 

 magnified, at figure 240, is rather larger than the last, 

 and does not contract its stem spirally. Found in sea- 

 water. 



385. VoRTiCELLA kians. — The gaping Vorticella is very 

 minute, and resembles the preceding : it is distinguished 

 by a deep indentation at the mouth, probably the com- 

 mencement of spontaneous scissure. 



386. Vorticella racemosa is shewn at figs. 241 and 250. 

 It consists of a cluster of bells with a common stem : 

 when contracted, they resemble the V. socialis, and are 

 only distinguished from them by their not swimming 

 freely, but always attaching their long common stem to 

 some fixed object : they expand and contract with amaz- 

 ing rapidity : by a scission of the parent into eight 

 smaller ones, and each of these again into eight, a cluster 

 is speedily formed from a single polype. 



387. Vorticella ampulla [FoUiculina, Lam.) The 

 pitcher-shaped Vorticella, shewn at fig. 264, is enclosed in 

 a curious shell- like case, which serves for a protection to 



