FAMILY 10. PURPURIFERA. 227 
polished, and often armed at the top with a very sharp point ; the aper- 
ture is oblong, and rather large; the columella is somewhat expanded, 
very smooth and shining, and the outer lip is thickened as forming the 
last rib. There is no operculum. 
Examples. 
Pl. CCLXIII. Fig. 1. 
Harpa IMPERIALIS, Chemnitz, Conch., vol. x. p. 184. pl. 152. f. 1452. 
Lamarck, Anim. sans vert., vol. vii. p. 254. 
Buccinum costatum, Linneeus. 
Dolium Lyra Davidis, Martini. 
Buccinum harpa, var., Bruguiere. 
Harpa multicostata, Sowerby. 
Harpa ventricosa, var. «. Deshayes. Kiener. 
Pl. CCLXIII. Fig. 2. (fossil.) 
Harpa mutica, Annales du Muséum, vol. ii. p. 167. and vol. vi. pl. 44. 
f.14. Anim. sans vert., vol. vil. p. 257. 
DOLIUM, Lamarck. 
Testa tenuis, rotundo-ovalis, ventricosissima, canali brevissimo, posticé 
recurvo, ad basem terminata; spira brevi, anfractibus szpissimé 
transversim costatis, ultimo umbilicum interdum formante ; aper- 
tura ampla; labro columellari tenuissimo, subexpanso ; labro ex- 
terno plerumque vel fimbriato, vel crenato. Operculum nullum. 
The Dolia were distinguished by D’Argenville and most of the early 
naturalists by the common appellation of ‘‘ Tuns ;” Linnzus, however, 
systematically referred them to a place amongst his Buccina. Bruguiére 
followed the arrangement of Linnzeus; but Lamarck associated them under 
their old appellative as a new and distinct genus, in conformity with the 
advancement of classification. An attempt was then made by De Mont- 
262 
