H Y D R A. 



Though there are feveral fpecies of this genus, I (hall 

 mention but two of them, and thefe differ but little from, 

 each other, which is chiefly in the number and length of 

 their feelers. 



I fhouid not have introduced this genus, but that the 

 knowledge of the properties of this animal tends greatly 

 to illuftrate the nature of Zoophytes in general ; as this. 

 alone belongs to the frefh water, and all the others are 

 inhabitants of the fea. 



i. Hydra fufca. 



Hydra te?itaculisfuboc- 

 tonis longijfimis. 



Lo?igarmed frefh-water Polype- 



This frefh-water polype has 

 very long arms, often 8 irr 

 number, and feveral times 

 longer than its body. 



Ellis Corallin. tab. 28. fig. C. (The claws are here 

 Shortened, for the conveniency of introducing them within, 

 the iize of the plate.) 



Hydra fufca. Linn. Syft. Nat. Ed. 12. pag. 1320. 



2. Hydra vulgaris. 



Hydra tentaculis Ion- 

 gioribus fubfeptenis^ cor- 

 pora lutefcente pofice at- 

 tenuato. 



"The commo7i frefh-water Polype 

 of the ditches. 



This frefh-water polype has 

 longifh arms,, generally about 

 7, which are twice as long as 

 its body ; it is of a yellowifli 

 color, and fmaller towards the 

 bottom. 



Phil. Tranf. Vol. 57. pag. 430.. 



Frefh-water Polype. 

 tab. 19. 



Hydra gr if ea. Linn. Syfc. Nat. Ed. 12. pag. 1320. 



C In 



