314 



HYDRI1XE. 



2. H. VULGARIS, Pallas. 



HYDRA VULGARIS, Pall. Elench. 30 ; Johnst. B. Z. 122, pi. xxix. fig. 2. 

 GRISEA, Linn. Syst. 1320. 

 ,, BRUNNEA, Templeton, Mag. Nat. Hist. ix. 417, fig. 56. 



Woodcut, fig. 41. 



POLYPITES orange-brown body cylindrical ; tentacula 7- 

 12, rather longer than the body. 



THERE seems to be some variableness in the colour; a 



Fig. 41. 



bright red variety occurs occasionally, and Mr. Albany 

 Hancock has noticed a flesh-coloured variety in the North- 

 umberland lakes. The tentacles are rather numerous, 

 and have none of the remarkable extensibility which cha- 

 racterizes those of the following species. 



The number of eggs produced by a single polypite at 

 once seems to range from four to seven. 



Hab. Ponds and streams; common. 



Var. rubra, Putney Heath, near London (J. E. Gray) : 

 ponds on Wimbledon Common (G. II. Lewes). 



[The Hague (Trembley) .] 



