BIVALVES. ANOMIA. 



43 



entire. Although tlie generality of Anomiae 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 tei-minate in 

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



The European, Indian, American, and African oceans, 

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

 terranean and Northern seas. 



There are no less than fifteen or sixteen species to be 

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

 zerland produce most of them. 



