PLATE CLXVIIL 



Helix (succinea) testa oblonga fulva diaphana, anfractibus tribns, 

 apertura ovata. Mull. Zool. dan. prodr. 2912. 



Turbo subflavus pellucidus Imperforata, testa praetenul fragili, trium 

 spirarum. Trianfractus, Three Spired. 

 Da Costa, p. 92. fp. 51. PL 5. Jig. 13. 



The two Linnean species of fresh water helices, putrisy and Imiosa 

 are so closely allied, that authors have, not unfrequently, confounded 

 one with the other. Dr. Pultney considers our shell with some 

 doubt, as the Helix limosa of Linnaeus, in which particular wc 

 think, he must be mistaken. The figure given by Gualtierl 

 is the only one referred to by Linnasus, in the Systema Naturje, 

 for Putris, and that is most exactly the same as our shell, although 

 the design is taken from a minute specimen. Pennant's Helix Putris, 

 t. 86. f. 137. is apparently the H. limosa. Both the species in 

 question are well figured by Chemnitz, on the same plate. 



This shell is very common in ditches, ponds, and other watery 

 places, and especially in those overgrown with weeds. 



FIG. IL 

 HELIX BULLAOIDES. 



SPECIFIC CHARACTER. 



Shell ovate, smooth, glossy, horny, brittle, whorls reversed, spire 



short. 



