TO GEOLOGY. 121 



S. elegans. Plate 4. Fig. 109. 



Description. Shell subdiscoidal, polished, transversely 

 striate above, with two or three granular transverse lines ; 

 substance of the shell thin ; spire flattened ; suture fur- 

 rowed ; umbilicus wide, perspective, crenulate ; whorls 

 five ; mouth round. 

 Length 3-20ths, Breadth .3, of an inch. 



Observations. One of the specimens is so perfect as to 

 present coloured spots (oblique) on the whorl. It is with 

 much hesitation I place this and the two following species 

 in the genus Solarium. Their mouths are round, and 

 somewhat like that of the Delphinula and Turbo, but the 

 crenulate umbilicus seems to make it necessary to place 

 them in this genus. In the form of the mouth they re- 

 semble the S. variegatum (Lamarck), which is nearly 

 round. With that species they might form a natural group. 



S. cancellatum. Plate 4. Fig. 110. 



Description. Shell subconical, crossed by longitudinal 

 and transverse striae, which are thickened at the intersec- 

 tion ; substance of the shell thin ; suture furrowed ; umbi- 

 licus rather wide, crenate without, cancellate within, per- 

 spective ; whorls four ; mouth suborbicular. 



Length .1, Breadth 3-20ths, of an inch. 



The smaller figure is of the size of nature. 

 Observations. This beautiful little species has in its ge- 

 Q 



