Division II An oblique notch, inclining backwards. 
Ricinula. — Shell ovate, the exterior mostly tubercular or spinous : aperture oblong, with 
a demi-canal at the lower part, curved towards the back, terminated by an oblique 
notch : unequally toothed on the columella, and on the internal margin of the 
right lip, usually contracting the aperture. 
Plate XVIII. Fig. 8. R. digitata. 
Purpura. — Shell oval, smooth, tubercular, or angular: aperture dilated, the lower part 
terminating in an oblique sub-canaliculated notch. Columella flattened, pointed 
at the base. 
Plate XVIII. Fig. 9. P. Persica. (Buccinum Persicum — Linn.) 
Monoceros. — Shell oval : aperture longitudinal, the lower part terminating in an oblique 
notch. A conical tooth on the internal base of the right margin. 
Plate XVIII. Fig. 10. M. cingulatum. [Mrs. Mawe’s Cabinet.] 
Concholepas. — Shell inflated-oval, semi-spiral, the summit inclining obliquely towards 
the left margin: aperture large, longitudinal, oblique, with a slight channel at the 
lower part. Two teeth at the base of the right margin : an oblong, thin, corneous 
operculum. 
Plate XVIII. Fig. 11. C. Peruvianus. (Patella lepas. — Gmel.) [Mrs. Mawe’s Cabinet.] 
Harpa. — Shell oval, more or less inflated, with longitudinal, parallel, inclined, and acute 
ribs ; spire short: aperture notched at the lower part ; no canal. Columella smooth, 
flattened, and pointed at the base. 
Plate XIX. Fig. 1. H. rosea. (Buccinum liarpa, Variety. — Linn.) 
Dolium. — Shell thin, ventricose, inflated, mostly sub-globular, rarely oblong, transverse- 
ly banded; the outer lip dentated or crenated through its whole length: aperture 
oblong, notched at the lower part. 
Plate XIX. Fig. 2. D. olearium. (Buccinum olearium. — Linn.) 
Buccinum. — Shell oval or ovate-conical : aperture longitudinal, with a notch at the base ; 
without a canal. Columella not flattened, swoln on the upper part. 
Plate XIX. Fig. 3. B. testudineum. (Idem. — Linn.) 
Columella callous, ( Nassce .) 
Plate XIX. Fig. 4. B. Thersites. (Idem. — Linn.) 
Eburna. — Shell oval or elongated, the right lip very simple : aperture longitudinal, notch- 
ed at the base. Columella umbilicated on the upper part, and canaliculated below 
the umbilicus. 
Plate XIX. Fig. 5. E. glabrata. (Buccinum glabratum.— Linn.) 
