OF CONCHOLOGY. 103 



SOLEMYA, Lam. 

 S. VENTRICOSA, Conrad. 



The external form and the rays indicate this shell to be a true 

 Solemya, where it must remain until the hinge has been seen. 

 Mr. Gabb refers it to Siliqua patula, Dixon, but it diflFers greatly 

 in form, being highest posteriorly, and especially varies by the 

 rayed posterior lines, and it is besides an extinct species. 



