179 
C. Srritora. F. p. 305.—Tursgo 8. Mont. p. 
306. ¢. 10. f. 5.—D. p. 857.—An. Lin. 1238.?—Lin. 
T. 8. p. 172.—Dor. Cat. p. 50. t. 14. f. 10.—T. 
Carinatus. Da. Cost. p. 50. t. 14. f. 10.—Whorls 
four or five, flat above, white (semipellucid when recent) 
rather strong, base wrought with fine spiral strize, which 
towards the upper part rise into three distaut elevated 
membranaceous ridges, the furrows deep and rounded at 
the bottom ; strongly striated longitudinally from top to 
base (chiefly conspicuous in the interstices) ; apex not 
very pointed ; aperiure suborbicular, angulated above, 
marginated. 0,20...0,17. Kent, Cornwall, not common. 
C. Costata. F. p, 305.—Turso C. Adams in Lin. 
T. 3. p. 65. t. 13. f. 138,4.—Mont. p. 311. t. 10. 7. 6. 
—D. p. 860.—Lin. T. 8. p.174.—Walk. f. 47.—T. 
Crassus. Adams Mier. t. 14. f. 26.—Sirong, subpel- 
lucid, glossy, white, with four or five much raised and 
well defined volutions, furnished with strong ribs 
which terminate on the body whorl in a strong spiral 
rib, and finely striated transversely (the strize most con- 
spicuous in the interstices) ; apex rather obtuse ; aper- 
ture suborbicular, lip a little expanded, a groove behind 
it extending behind the pillar to the aperture. 0,20... 
0,05. Devon, Dorset, Pembrokeshire, (in drift sand) 
not uncommon, in Scotland rare. 
