of the Land and Fresh-water Shells of Suffolk. 159 



This shell, of which 1 have taken two specimens in Ilolbrook 

 mill-pond, is of nearly the same shape with IJ. alba, yet cannot 

 be mistaken for it. It agrees also in many respects with Flanorbis 

 spirorbis of Draparnaud, which is a different species from the 

 li. spirorbh of Sifst. Nat. as I have remarked in its place, but 

 being striated in the transverse direction, a circumstance unno- 

 ticed by him, and which he could not have overlooked, it must 

 be considered as new ; and I have accordingly honoured it with 

 the name of that sagacious conchologist. 



37. Helix fontana. Trans. Linn. Sac. vol. viii. p. 193. 



Pond in the Round Meadow, on the estate of John Sheppard, 

 Esq. of Campsey Ash ; and in Baylham pond. 



In Ramsey decoy-pond, Essex. 



The identity of this species with Nautilus lacustris is I know 

 looked upon as certain by some conchologists : I can only say, 

 that I have taken some thousands of them without their assuming 

 in a single instance the form of that shell. 



a 



38. Helix Somersiiamiensis. 



H. testa grisea umbilicata, anfractibus 2 vix 3 reticulatis. 

 Habitat in sylvis, rarissima. 



Equal in magnitude to a middle-sized LL alba, which it resem- 

 bles in shape ; is of a greyish colour, and curiously reticulated, 

 particularly above. 



The only two specimens I have met with were adhering to 

 the under-side of a small decayed branch of oak, in a grove on 

 the left-hand side of the road leading from Somersham to Flow- 

 ton. 



It is perfectly distinct from any species hitherto described ; 

 and, from its similarity in shape to Llelix alba, has been placed- 



as 



