PLATE XXXIX, 



FIG. I. 

 HELIX CORNEA. 



ram's horn. 



GENERIC CHARACTER. 



i 



Aperture of the mouth, contracted, and lunated. 



SPECIFIC CHARACTER 



AND 



SYNONYMS. 



Wreaths, four, turned nearly horizontal : rather depressed or concave 

 towards the centre. 



Helix Cornea : testa supra umbilicata plana nigricante, anfractlbus 

 quatuor teretibus. Lin. Syst. Nat. p. 1 243 . No. 67 1 . 

 — F. Suec. I. p. 373. No. 1304. //. No. 2179. 



Cochlea pulla, ex utraque parte circa umbilicum cava. List. II. 

 Angl.p. 143. tit. 26. tab. 2. Jig. 26. 



Cochlea maxima, compressa, fasciata. List. H. Conch, tab. 136. 

 fig. 40. — Cochlea pulla quatuor orbium coccum 

 fundens, purpura lacustris. Id. tab. 137. fig, 41. 



The Flat Whirl. Grew. Mus. p. 136. 



Planorbis fluviatilis major vulgaris. Petiv. Gazoph. tab. 92. Jig. 5. 



Helix Cornea, Horny. Penn. Br. Zool. No. 126. tab. 83. fig. 126. 



A 4 



