192 
ZOOPHAGA, 
Shell spiral and enveloping ; aperture either canalicu- 
lated or notched. 
Tripg.--CANALIFERA. 
With a longer or shorter canal at the base of the 
aperture; the outer lip not changing its form by 
age. : 
Grenus.—CERITHIUM. 
Turreted ; the aperture oblong, oblique, terminated at 
its base by a short canal which is either truncated 
or recurved, never notched ; a groove at the upper 
part of the right lip; a small horny, orbicular 
operculum. 
C. Costatum. F. p. 357.—StromsBirormis C. 
Da Cos. p. 118. ¢. 8. f. 14.—StromsBus C. Don. t. 
94.—Mont. p. 255.—Lin. T. 8. p. 142.-—Dor. Cat. p. 
46.¢.14. f. 14.—D. p. 678.—Turreted, dark brown, 
with ten or eleven whorls furnished with numerous fine 
close-set longitudinal ribs and an elevated spiral line 
turning round the bottom of each volution and becoming 
double at the base of the shell; aperture suborbicular, 
outer lip a little expanded, inner lip smooth, witha 
short canal. #%. Devon, Cornwall, rare. 
