386 
_ Diviston II. — An oblique notch, inclining hackwards. 
Ricinuta.—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. ] 
ConcHoLEepas.—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. T'wo 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 harpa, Variety—Linn.) 
Dotium.—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.) 
Bucctnum.—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, (Nasse. ) 
Plate XIX. Fig. 4. B. Thersites. (Idem.—Linn.) 
Exsurna.—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.) 
