VALVATA. 23 



The outer lip slightly recedes anteriorly. The diameter is 

 about the tenth of an inch. 



Animal of a general dusky grey hue approaching to 

 black on the sides of the snout and neck. Tentacles verv 

 long, greyish white ; eyes at their bases within pale pro- 

 minent spaces. Branchial plume broadly triangular, very 

 sensitive, retractile, greyish white ; tentacular filament 

 long, curved upwards, white ; foot grey, strongly and 

 acutely bilobed in front. 



It inhabits ponds and ditches in many parts of Britain ; 

 general through the south-eastern parts, Clumber Lake, 

 Cardiif (Jeffreys) ; Bath (Clark). In ponds at Prestwick 

 Car, Northumberland (Alder) ; Scarborough (Bean) ; 

 Duddingston, near Edinburgh (E. F.) ; Clare, in Ireland 

 (Humphreys). " Distributed all over Ireland " (W. 

 Thompson).* 



* The V. minuta of Turton was in all probability derived from an immature 

 shell, but the specimens are no longer to be met with in his collection. The 

 specific distinctness of the minuta of Draparnaud we have likewise doubted, 

 and find the shell introduced in Dr. Menke's Monograph of Valvata (Zeits. Mai. 

 1845, p. 127), without any further particulars than its original most imperfect 

 definition. 



