159 
Sup. p. 147. €. 21. f. 3.—(young.—Walk.t.1. f. 23.) 
—White, smooth, glossy, subopaque ; whorls three, 
round, nearly on a level above ; beneath with a central 
cavity, round which there are traces under a high mag- 
nifying power of diverging lines of growth ; aperture 
circular, with the margin a little reflected. 0,10. Not 
uncommon from deep water. 
S. Divisa. F. p. 315.—Turso D. Adams. Lin. T. 
3. p. 254—White, glossy, subpellucid ; whorls three or 
four, rounded, nearly on a level above, the lower half of 
each whorl spirally striated ; beneath, with a large cen- 
tral patulous cavity exposing the whorls; aperture cir- 
cular and usually detached from the body-whorl. 0,08, 
Common in deep water. 
Trisz.—TURBINACEA. 
Turrited or conical; with the aperture oblong or 
rounded, not expanding, and the margins disunited. 
Grnus.—TROCHUS. 
Conical, the spire elevated, sometimes shortened; the 
periphery angulated or subangulated often thin and 
acute ; aperture transversely depressed, the margins 
disunited above ; columella arcuated, more or less 
projecting at the base ; onerculated. 
