formed iuto small cavities (giving the shell a denticu- 
lated appearance) the rtbs crost by most minute spiral 
striz ; aperture oval oblique, strongly marginated, 
pillar lip not reflected. 4...0,08. Weymouth, rare. 
C,. Denticurata. fF. p, 306.—TurBo D. Mont. 
p. 315.—D. p. 859.—Lin. T. 8. p. 173.—Conic, 
subpellucid, white, the apex obtuse; whorls six. each 
with nine or ten coarse ribs projecting at the top of each 
spire and forming indentations as in the last; aperture 
suborbicular, outer lip thickened by a mb, pillar lip 
smooth and indented, with one or two small tubercles 
at the base adjoining the ribs. 0,22...0,11. Weymouth. 
—The ribs are not undulated as in the preceding, but 
run obliquely to the left. 
C. Semicostata. #. p. 307.—Turso 8. Mont. p. 
326. and Sup. p. 129. ¢. 21. f. 5.—D. p. 837.— 
Lin, T. 8. p. 162.—-T. Evecans. Lin. T. 3. p. 66. t. 
13. f. 31,2.--Short, conic, white, obtusely pointed ; 
whorls four or five, rounded and well defined ; wrought 
with faint ribs and fine obsolete transverse striz on the 
body whorl, the ribs not extending to the lower part 
where the striz are most conspicuous ; aperture subor- 
bicular, pillar lip slightly reflected. 0,04...0,08. In 
sand, Devon. 
H 3. 
