41 
SPHyERA. 
/ 
Gen. Char. A globose, eared, bivalve ; with 
one central and two? remote teeth about 
the hinge. 
Ears obtuse, short, incurved ; the line of the hinge is 
long, slightly curved, and terminated at one, perhaps 
at both ends, bv a flat obscure tooth beneath the com- 
mencement of the ear; in the centre of it, is a large 
irregular tooth, transversely flattened and turned to- 
wards the incurved beak ; the shell is thick and very gib- 
bose. 
Of this newly discovered Genus only one species has 
been found, and of that only one valve, therefore it is not 
known whether it be equalvalved or not : neither has the 
situation of the ligament, or impressions of the muscles 
been ascertained, the shell is so strongly cemented to the 
stone ; it is thought convenient, however, to publish it 
for the purpose of inducing further research, and of sup- 
plying Geologists with a name for it, as if is a fossil 
characteristic of a stratum where shells are rare. 
