35 
ALATA. —38 GENERA. 
Shell mith a more or less elongated canal at the base of the aperture, the right lip of which changes 
its form nith age, and has a sinus at the lower part. 
RostTe.iartA.—Shell fusiform or sub-turreted, terminated by a beak-shaped canal; right 
lip entire or toothed, more or less dilated with age; with a sinus contiguous to 
the canal. ; 
Plate XVIII. Fig. 3. R. pes-pelicani. (Strombus pes-pelicani.— Linn.) 
Prerocera.—Shell ovate-oblong, ventricose, terminated at the lower part by an elon- 
gated canal: the right lip dilated by age into a digitated wing, with a sinus to- 
wards the base. Spire short. 
Plate XVIII. Fig. 4. P. aurantia. 
Srromsus.—Shell ventricose, terminated at the base by a short, notched, or truncated 
canal: right lip dilated by age into a simple wing, lobed or crenated at the upper 
part, with a sinus at the lower part, separate from the canal or notch of the base. 
Plate XVIII. Fig. 5. 8. auris Diane. (Idem.—Linn.) 
PURPURIFERA. — 11 GeEneERa. 
Shell with a short canal ascending posteriorly, or an oblique notch or demi-canal at the base of the 
aperture, directed towards the back. 
Tuis Family is separated into Two Divisions. 
Division I, The canal ascending, or curved towards the back. 
Casstpar1a.—Shell sub-ovate or ovate-oblong: aperture longitudinal, narrow, termi- 
nated at the base by a curved, sub-ascending canal. Right lip varicose or repli- 
cate; left lip laid over the columella, mostly rough, granulated, tuberculated, or 
wrinkled. , 
Plate XVIII. Fig. 6. C. thyrrena. (Buccinum thyrrenum.—Linn.) 
Cassts.—Shell inflated: aperture longitudinal, narrow, terminated at the base by a short 
canal, abruptly curved towards the back of the shell: columella plaited or trans- 
versely wrinkled. Right lip mostly toothed. 
(a) Spire having varices. 
Plate XVIII. Fig. 7. C. zebra. (Buccinum strigatum.—Gmel.) 
(b) Spire nithout varices. 
Plate XVIII. Fig. 7. (a) C. testiculus. (Buccinum testiculus.—Linn.) 
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