PLATE CLXVIII. 



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



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



Turbo subflavus pellucidus imperforate, testa praetenui fragili, trium 



spirarum. Trianfractus, Three Spired. 

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



The twoLinnean species of fresh water helices, putris, and limosa 

 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 we 

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

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

 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 waters- 

 places, and especially in those overgrown with weeds. 



FIG. II. 

 HELIX BULLAOIDES. 



SPECIFIC character. 



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



short. 



