Or 
~I 
ITANTHINA. SICARETUS. 
LES IANTHINES. 
IANTHINA. 
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. lL. 
B. W. 34. 116. 
LES MACROSTOMES. 
SICARETUS. 
Sub-auriform, sub-orbicular ; outer lip short, and 
spirally intorted ; aperture entire, very expand- 
ing, ovate-oblong; the margins disunited., 
S. HALIOTOIDEUS. Auriform, back convex 
depressed, white, with crowded transverse undu- 
lated striz; spire flat; aperture greatly dilated ; 
umbilicus covered; diam. 14. W. 34. 187. 
S. concavus. Ovate, back convex, with 
transverse undulated striz, reddish fulvous ; spire 
whitish, slightly prominent; aperture very con- 
cave; umbilicus half covered; diam. 14. S. 334, 
S. AusTRALIS. Auriform, back slightly con- 
vex, longitudinally striolate and transversely un- 
D2 
