of the Land and Fresh-zmter Shells of Suffolk. 157 



In Essex it is in great abundance in a pond on the right-hand 

 side of Mrs. Gox's Lane, Wrabness. 



Those found at Spexhall are minute, greenish, and have long 

 reflexed spines ; in other situations where I have found them, 

 they have been considerably larger, reddish, with much shorter 

 spines. 



This species varies in size and colour, and in being with or 

 without annuli and spines; in consequence whereof M. Drapar- 

 naud has made two species, viz. Planorbis cristatus and Platiorbis 

 iw^ncfl/MS, but without sufficient reason. v. 



28. Helix planorbis. Trans. Linn. Soc. vol. viii. p. 188. 



River Gipping and adjoining ditches. 



From Ramsey stream in Essex I have a curious deformed va- 

 riety, in which the volutions are nearly disjoined, or pulled out 

 si it a dicam. 



30. Helix complanata. Linn. Sijst. Nat. ed. xii. wl. ii. 



p. 1242. 



River Blythe, near Halesworth ; Baylham pond ; ditches by 

 the River Ore at Blaxhall ; Holbrook stream and mill-pond ; 

 and ditches near the River Stour at Higham. 



That this is the true Helix complanata of Linnaeus, some 

 learned conchological friends coincide with me in opinion. 

 Notwithstanding, however, that its appearance is so much in 

 favour of its being a distinct species, it may after all be the 

 young of H. planata. It is certainly found in the places 

 where that shell occurs ; and although its under superficies be 

 flat, yet by age the under-side of the lowest volution may become 

 tumid, which would throw the carina into the middle of the 

 whorl, and cause it at once to become a very Helix planata. 

 This is however merely conjecture, but such as may hereafter be 



verified : 



