J 12 GENUS XXIV. BUCCINUM. 



names as follows: — first, AmjmUacea; second, Cassidea cmidala ; 



third, Casnidea ungincidata ; fourth, Callosa ; Mill, Detrita; sixth, 



Lcevigata ; seventh, Angulata ; and eighth, Turrita. 



The spiral striae are generally called transverse, and the 



contrary ones longitudinal. 



Linnaeus has described 51 species, Gmelin has added 121, 



and Dr. Turton 28. Total, 200. 



Lamarck has divided this genus into eight, as follow : 



Nassa. Sliell oval, the aperture ending at the lower end in 

 an oblique hollow turning upwards toward the back; 

 the left lip thickened, forming on the pillar, which it 

 covers, a transverse fold at the upper part, and having its 

 base obliquely truncated (^see Buccinum Arcularia,/. 77). 



Purpura. Shell oval, generally rough, with spines or tubercles ; 

 the aperture ending at its base in a short oblique channel, 

 hollowed at the extremity ; the pillar naked, flat, and ter- 

 minating in a point at the base (see Bitccitmia Lajiillus, 

 /.78). 



BucciNUM. Shell oval or lengthened; the aperture oblong, 



with a hollow at the base, without a canal ; the hollow 



is uncovered at the front part ; pillar convex and full, 



without any flattening at the base (^see Buccinum undatum, 



f. 79). 



Eburna. Shell oval or elongated, smooth, the right edge 

 very entire ; the aperture oblong, with a hollow at the 

 base ; the pillar umbilicated, and slightly grooved at the 

 base (see Buccinum glabratum, f. 80). 



