400 Microscopical Essays. 



This polype has a veficular body, and four -obfolete arms; is 

 found in the abdomen of iheep, fwine, &c. 



6. Hydra fientorea, tentaculis ciliaribus -corpore infundibuli- 

 formi. 



This polype has been called tunnel fhaped ; thr atl ; fer- 

 mounded with a row of hairs ; it is reprefented at Fig. 2| > 2% 

 Plate XXII. 



7. Hydra focialis mutica torofa rugofa. 



Bearded thick and wrinkled, Fig. 11, Plate XXL 



Of the Hydra Viridis, Hydra Fusca, and Hydra 



Grisea. 



Thefe three fpecies of the hydra having been thofe on which 

 the greater!; number of experiments have been made, and of 

 which we have the belt information, it is of thefe only we fhall 

 fpeak in the following account, unlefs we give particular notice 

 thereof to the reader. 



There are few animals more difficult to defcribe than the hydra, 

 as it has fcarce any thing conftant in it's form, varying con- 

 tinually in it's figure ; they are often fo befet with young, as to 

 appear rarnofe and divaricated, the young ones conftituting as it 

 were a part of the parent's body. 



Whoever 



