CERITHIUM. PLEUROTOMA. v9 
C. LITERATUM. Turreted, ventricose ; whorls 
with numerous dotted muricated stria, and a row 
of tubercles above ; white, prettily dotted with red 
or black; outer lip forming an angle with the 
body-whorl; canal truncated. 3. W. 28. 163. 
C. TUBERCULATUM. Ovate-conic, ventricose 
at the base; whorls finely striated transversely, 
brownish white, coronated with one row of small 
black tubercles, the body-whorl with several ; 
apex white; beak short and truncated. 1. W. 
25. 38. 
C. PERVERSUM. Reversed, cylindrically sub- 
ulate, slender, pale rufous, with three transverse 
granular strize on each whorl; whorls flattened ; 
base plano-concave; canal straight, slightly pro- 
-minent. B. 2. W. 28. 167. 
C. costatum. Turreted, deep brown, with 
the ten or eleven whorls longitudinally ribbed ; 
aperture sub-orbicular ; beak sub-truncated ; lip 
expanded. 3. B. W. 25. 43. 
PLEUROTOMA. 
Shell either turreted or fusiform ; terminated in- 
feriorly by a straight canal more or less elon- 
gated ; lip at its upper part having a fissure or 
emargination. 
P. BaByLONIA. Fusiform, turreted, trans- 
versely carinated and banded, white; bands 
