CONTRIBUTIONS 



neral form most resemblance to the variegatum of Lamarck. 

 It is, however, a minute shell, and differs in most of its 

 minor characters. 



S. granulatum. Plate 4. Fig. 111. 



Description. Shell conical, flattened below, with seven 

 or eight transverse granulate lines, between which it is 

 furnished with oblique striae ; substance of the shell thick ; 

 suture furrowed ; umbilicus narrow, largely crenate with- 

 out, striate within ; whorls five ; mouth nearly round, sub- 

 angular above ; outer lip crenate. 



Length .2, Breadth .2, of an inch. 



The smaller figure is of the size of nature. 



Observations. This truly beautiful little species resembles 

 more nearly a Turbo than either of the two last. The 

 roundness of its mouth and the elevation of its spire would 

 seem to forbid its being placed in the genus Solarium. Its 

 crenulate umbilicus, its granulations, and its crenulate lip 

 seem to make it necessary to place it here. It certainly 

 resembles S. variegatum, but is more conical and has not 

 so wide an umbilicus. I place it last of the genus, and it 

 may be considered the connecting link with the Turbones. 



Sedgewick and Murchison, on the structure of the East- 

 ern Alps, a most valuable memoir in the Geological Soci- 

 ety's Transactions, vol. 3 of 2d series, plate 38, fig. 14, 

 represent a shell under the name of Turbo arenosus, which 

 certainly resembles our shell, but it is more elevated. 



