TO GEOLOGY. 1 19 



FAMILY TURBINACEA. 



GENUS SOLARIUM. Lamarck. 



S. bilineatum. Plate 4. Fig. 106. 



Description. Shell sublenticular, rather elevated above 

 and flattened below, with a double line near the margin ; 

 substance of the shell rather thin ; suture with a double 

 impressed line ; umbilicus very wide, perspective, largely 

 crenate ; whorls five, sharply carinate ; mouth subtri- 

 angular. 



Length .2, Breadth 9-20ths, of an inch. 



Observations. A beautiful depressed species, remarka 

 bly flat on the inferior side. In a young specimen the 

 inferior side of the carina is somewhat crenate. Within 

 the umbilicus, beyond the crenulated edge, there is a 

 minute transverse line. 



S. Henrici. Plate 4. Fig. 107. 



Description. Shell lenticular, rather flattened at the 

 apex, with radiating wrinkles above and below, furrowed 

 on both sides of the carina which is slightly crenate ; sub 

 stance of the shell thin ; suture impressed ; umbilicus 

 very wide, perspective, crenate, deeply furrowed within ; 

 whorls four ; mouth triangular. 



Length l-20th, Breadth .2, of an inch, 



