60 BrvAl.VES AXOMIA. 



resembling glass; and, as is reported, frequently made 

 use of by the ini>enious Chinese as a substitute for it. 



The hinge of the Anomia admits of considerable va- 

 riation; but its most prominent feature is that of being 

 furnished with a linear prominent cicatrix, and a lateral 

 tooth placed within ; and in the flattest valve, quite on 

 the margin, are placed two bony rays, or linear callosities, 

 which serve as a base for the animal. However, some 

 have only one tooth or ray in each valve. The interior 

 of these shells is often silvery, and the margin is frequently 

 crenate, notched, or toothed, but in many it is perfectly 

 entire. Although the generality of x\nomiae are mode- 

 rately smooth on the outside, yet there are two excep- 

 tions to be found in the Anomia spinosa and muricata, 

 both of which are covered with striae, which terminate in 

 scales and hollow spines, almost as long as the shells. 



The European, Indian, American, and African oceans, 

 supply many species of the Anomia, as also do tlie Medi- 

 terranean and Northern seas. 



There are no less than fifteen or sixteen species to bfr 

 met with in a fossil state. England, Germany, and Swit- 

 zerland produce most of them. 



ANO M 1 A . '^A nomia. 



Crnniolari*. Scobinata. 



*Peclmata. Aurita. 



*Ephippiu m (G^rfsn Onion-rind) Retusa. 



*Cepa (Onion-peel.) *Gryphu». 



Electrica {Small amber A.) *Pectens. 



*Squamula, Striatula. 



Patclliformis. Dorsata. 



