100 UNIVALVES. — BUCCINUM. 



Division VI. — Shell with the pillar-lip dilated and 



THICKENED, AND APERTURE WIDE. 



Family 1. — With the pillar-lip much thickened and dilated. 

 Arcularia — Broad-lipped. Verrucosum — Warty. 



Coronatum — Crowned. Gibbosulum — Gibbous. 



*Hepaticum — Small-knobh' d. Clathratum — Latticed. 

 Pullus — Young. Niveum — Cancellated. 



Thersites — Pale-olive. Lima — Acumhiated. 



Family 2. — With the pillar-Up spread, but not very thick. 

 Textum — Turreted. VWcdLiulum— Plaited. 



*Reticulatum — Retictdated. Piscatorium — Knobbed. 



*Ambiguum — Small-plaited. Mauritii — Six-toothed. 



*Macula — Spot-lipped. Armillatum — Brown. 



Stolatum — Brown-banded. Nitidulum — Thin-banded. 



Ventricosum — Ventricose. 



Family 3. — Obtuse, convex, depressed, and smooth. 

 N eriteum — Nerite-shaped. 



Division VII. — Shell with longitudinally keeled^ 



MUCRONATED RIBS, PILLAR SMOOTH. 



Harpa — Harp. Crenatum — Crenated. 



Cancellatum — Latticed-harp. Costatum — Many-ridged. 



Division VIII. — Pillar-hp appearing as if worn flat, 



APERTURE very WIDE AND OPEN. 



Family 1. — Armed with a subulate tooth at the base. 

 Monodon — One toothed Scoop. Narval — Unicorn. 

 Irabricatum — Imbricated. Cingulatum — Belted. 



Crassilabrum — Thick- lipp'd. Rhinoceros — Smooth. 



Family 2. — Withozit the tooth, and the outside striated. 

 Haustrum — Scoop. Sertnin—Ches7iut. 



Persicum — Persian. Vexillum— F/a^. 



Family 3. — With the outside tuberculated. 

 Patulum — Wide-mouth' d. Hsemastoma — Red-lipped. 



Luteostomum — Pallid. Armigerum — Armed. 



Dentex-^ Toothed. 



