of the Land and Fresh-water Shells of Suffolk. 157 
In Essex it is in great abundance in a pond on the right-hand 
side of Mrs. Cox'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 Planorbis 
imbricatus, but without sufficient reason. 
98. Hetrx pranorsis. 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 ita dicam. ! 
30. HELIX COMPLANATA. Linn. Syst. Nat. ed. xii. vol. 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 Helir complanata of Linnzus, 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, vet 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 : 
LA 
