386 



and more diaphanous : and when the animal is fufFered 

 to remain wiihin the (liell, it contra6ls, and gives a dark- 

 er colour to the fuperior volutions. 



It is certainly a very rare fpecies, or fo large a fliell 

 could not have fo long efcaped notice. 



The H. acuta figured by Chemnitz, which he flates 

 to be found in Italy, appears to be only a variety of the 

 detrita. 



Gmelin has confidered them as dillinft ; but has fal- 

 len into an error in quoting Li^er Conch, t. ig. f. 14. the 

 Turbo fafciatus of this work, which is perfe6lly difiinft, 

 and does not feem to have been known to Linn/eus. 

 MuLLER has made the fame miflake. Doclor Pulte- 

 NEY had certainly confidered the H. detrita and acuta 

 as only varieties, as he quotes both thofe (hells figured 

 by Chemnitz. 



13. 

 Wivii'ARA. Helix vivipara. Lia.Syft.p.l247. — Gmel. SyJi.p.3646A05 



Chein. Conch, ix t 132. f. 1182. to 1185. 

 Petiv. Ga%. t. 99. f. \6.—GuaJt. t. 5. A. 

 Lijler Co7ich. t. 126. f. 2b.— Id. tab. Amt. 



f. b.—Id. Atigl. t. 2. f. 18. 

 Schroder Fh/Jfcotich. t.S f. 1.2.— &t. Miti. 



C. f. e.—Fava/K t. 61. D. 9. 

 Br. Zool. t. 84. f. 132. & t 85 upper fig. 

 (young.) — Don. Br. i>hells. iii. t 87. 



Helix 



/ 



