206 



Voluta — continued. 



heterocUta. . base smooth, spire ribbed, rather tuberculated, 



columella with the smallest plaits upwards, as in Mitra 



— 2^ inches. 

 digitalina . . decussated, subgranular, spire short — 1 inch — 



perhaps a variety of V. crenulata. 

 clathrata. . subcoronetted, cancellated, columella with numerous 



plaits— 1 1 inch. 

 atnbigua*. . transversely striated, longitudinally ribbed, spire 



subdenticulated, lip sulcated internally, the lower folds on 



the columella the largest — 1| inch. 

 jiculina. . transversely striated, last wreath crowned with spines, 



lip submarginated, striated inside, and bowed at the top 



— 2 inches. 

 rarispina. . with two or three dorsal spines, lip rather bordered, 



spire small, with five or six dentellated turns — 1| inch. 



Mitra. 



crebricosta. . ribs obsolete in the lower part, four folds — | inch. 

 monodonta. . smooth, but striated in the upper part — small. 

 marginata. . a crenulated border on each turn. 

 pUcatella. . margin of the turns subplicated — f inch. 

 lahratula. . ribs decussated with transverse strise — | inch. 

 mixta. . resembles marginella, but has the folds of the mitres — 



f inch. 

 cancelUna. . lip internally striated. 

 terehellum. . narrow, fusiform — small. 

 fusellina. . smooth, base striated — small. 

 graniformis. . longitudinally ribbed — very small. 

 mutica. . no striae on the spiral wreaths, four folds — 1 inch. 

 elongata. . fusiform, smooth, five folds — 2 inches. 

 citharella. . distant longitudinal ribs, four folds, no left lip. 



Marginella. 



eburnea. . spire conoidal, the borders of the turns confluent. 



dentifera. . smooth, spire subpyramidal. 



ovidata. . lip grooved internally, four folds — ^ inch. 



Cancellaria. 



costulata. . longitudinal, decussated, ribbed, three folds — | to f 



inch. 

 volutella. . with the varices of a murex, the folds of a volute, and 



the notch of a buccinum — f inch. 



Purpura. 



lapilliisf. . acutely ovate, ribs transverse, lip subdentated. 



* Strombiis ambiguus. — Brand, Foss. No. 69. 

 ■f Buccinum lapillus. — Lin. 



