lANTHINA. SICARETUS. O/ 



LES lANTHINES. 



lANTHINA. 



Ventricose, conical^ thin, and pellucid ; aperture 

 triangular; columella straight, produced beyond 

 the edge of the outer lip; the lip or middle 

 sinus emarginate ; no operculum. 



I. COMMUNIS. Extremely fragile^ of a beau- 

 tiful violet hue ; aperture triangular, with a small 

 notch on the margin of the outer lip; diam. 1. 

 B. W. 34. 1 16. 



LES MACROSTOMES. 



SICARETUS. 



Sub-auriform, sub-orbicular ; outer lip short, and 

 spirally intorted ; aperture entire, very compand- 

 ing, ovate-oblong ; the margins disunited. 



S. HALiOTOiDEUS. Auriform^ back convex 

 depressed, white, with crowded transverse undu- 

 lated striae ; spire flat ; aperture greatly dilated ; 

 umbilicus covered; diam. IJ. W. 34. 187- 



S. coNCAvus. Ovate, back convex, with 

 transverse undulated striae, reddish fulvous ; spire 

 whitish, slightly prominent; aperture very con- 

 cave; umbilicus half covered; diam. IJ. S. 334. 



S. AUSTRALis. Auriform, back slightly con- 

 vex, longitudinally striolate and transversely un- 

 d2 



