151 



subglobose, light horn color, with four tumid smooth 

 whorls, the body one large, the two uppermost very 

 small and somewhat lateral ; aperture large suboval, 

 outer lip extremely thin membranaceous ; pillar lip 

 thick, white, grooved with a long canal terminating in a 

 small but deep umbilicus, i. Devon, fyc. 



GENUS. IANTHINA. 



Ventricose, conoid, thin, transparent ; aperture trian- 

 gular : columella straight, produced beyond the base 

 of the outer lip, which has a sinus in the middle of 

 it ; no operculum. 



I. COMMUNIS. Lam. 1. F.p. 326. I. FRAGILIS. 

 of most writers. Bl.tSl.f. la. (good). I. BICOLOR. 

 Menke. p. \4Q.-Philippi. p. 164. HELIX IAN- 

 THINA. Lin. 1246. Knorr. 2. t. 30. /. 2,3. List. t. 

 572. f. 24. Turt. D.p. 58. D. p. 938. Depressed, 

 conoid, obtuse, nearly smooth, a few indistinct spiral 

 striae on the base, the whorls flattish, violet beneath, 

 pale lilac above, body whorl obtusely carinated ; whorls 

 four, pillar rectangular to the outer lip ; aperture 

 broader than long, columella straight and short. Diam. 

 up to 1 . but rarely so large, not common but sometimes 

 found in Cornwall and Ireland. 



I. EXIGUA. Lam. 2. Sow. G.f. 2,3 Lesson, voy. 



