Microscopical Essays. 



399 



wlilcli is at one end, is furrounded by hair, like feelers. It fends 

 forth it's young ones from it's fides, which drop off; but in the 

 autumn it produces eggs from it's fide* 



i. Hydra viridis, tentaculis fubdenis brevioribus. 



Green polype, generally with about ten fhort arms ; it is re- 

 prefented at Fig. 5, Plate XXL 



2. Hydra fufca, tentaculis fubottonis longiflimis. 



This polype has very long arms, often eight in number; it is 

 reprefented at Plate XXI. Fig. 7. The arms are feveral times 

 longer than the body. 



3. Hydra grifea, tentaculis fubfeptenis longioribus, 



This. polype has alfo generally long arms, in number about 

 feven ; it is of a yellowifh colour, fmall towards the bottom ; it is 

 reprefented at Fig. 6, Plate XXL, 



4. Hydra pallens, tentaculis fubfenis mediocribus. 



The arms of this polype are generally about fix in number, 

 and of a moderate length. 



5. Hydra hydatula, tentaculis quaternis obfoletis corpore veftV 

 cario, Fig. i, 2, 3, 4, Plate XXL 



This 



