TO GEOLOGY. 119 
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. Ina 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. Henvrici. 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 1-20th, m Breadth .2, of an inch. 
