PLATE XXXIX, 



FIG. I. 

 HELIX CORNEA. 



RAMS HORN. 

 GENERIC CHARACTER. 



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, anfractibus 



quatuor teretibus. Lin. Sj/st. 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. 

 jig. 40. — Cochlea pulla quatuor orbium coccum 



fundens, purpura lacustris. Id. tab. 137. jig. 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. jig. 126. 



A 4 



