Microscopical Essays 



425 



Hydra Stentorea. Fig. 27 and 28, Plate XXIL 



Tentaculis ciliaribus corpore infundibuliformi. 



The arms of this hydra are rows of fhort hairs, the body 

 trumpet-fhaped. 



This fpecies of hydra is very common, and has been deferibed 

 by almoft every writer on thefe fubjects ; it is placed by Muller 

 among the vorticellae. 



Vorticella ftentorea caudata, elongata, tubasformis limbo eili- 

 ato. Muller animalcula infuforia. 



They are named by Mr. Baker and Mr. Trembley the funnel* 

 like polype* 



There are three fpecies of them,, which are of different colours, 

 green, blue, and white. The white ones are the mofl common* 

 It is neceflary to obferve them often, and in various attitudes, in 

 order to obtain a tolerable idea of their ftruclure. They do not 

 form clufters, but adhere fingly by their tail to whatever comes in 

 their way y their anterior end is wider than the poflerior, and 

 being round, gives the animal fomewhat of a funnel form, though 

 it is not completely circular, having a fort of flit, or gap, that 

 interrupts the circle. The edge of this opening is furniftied with 

 a great number of little fimbrillae, which, by their brifk and con- 

 tinual 



gjetiol'ata corpore cylindrico, in cujus apice os,, quod colore. compreflb, movet tec- 

 te.cula vix raanifefta. Lin. Syft. Nat. p. 1321.. 



