DESCRIPTION. 
157 
pearlaceous ; columella white ; grooves obsolete 
on the under part ; umbilicus circular, perforate. 
Inhabits 
Fig. 7. T. scalaris. 
Shell conical, cancellate, or ribbed longitudi- 
nally ; whorls distant. 
D\Argenville Conch. Tab. 11. Fig. 5. 
Specimen white, umbilicate, imperforate ; no 
solid columella ; whorls round, connected by the 
longitudinal, carinate, sub-oblique ribs, which are 
not continuous, but encompass each whorl sepa- 
rately, and adhere to each other at the upper and 
lower part ; extremely thin and brittle. 
Inhabits the coast of Barbary. 
Fig. 8. T. Terebra. 
Shell tapering ; whorls with acute carinate striae. 
Lister Conch. Tab. 590. Fig. 4. 
Specimen brownish white ; whorls rather convex. 
Inhabits European, African, and Chinese shores. 
