PECTEN DISLOCATUS. 



DESCRIPTION. 



Shell suborbicular, with twenty or twenty-two elevated 

 rounded ribs and very numerous concentric wrinkles, 

 which are transversely rectilinear between the ribs and 

 equidistant ; longitudinal striae none ; whitish tinged with 

 yellow or reddish, with a few narrow, transverse, inter- 

 rupted and dislocated sanguineous undulated bands ; a^uri- 

 cles equal. 



SYNONYM. 



P. DISLOCATUS, S. Journ. dead. Nat. Sc. vol. 2, p. 260. 

 Encyc. Meth. pi. 213, fig. 3. 



OBSERVATIONS. 



The specimen represented in the annexed plate I obtain- 

 ed on the coast of South Carolina, where it is rare. I do 

 not know that the figure referred to above has been quoted 

 by any author excepting Dillwyn under the P. opercula- 

 ris, L. Mr. Conrad considers the dislocatus as identical 

 with the purpuratus. Lam. 



REFERENCE TO THE PLATE. 



Fig. 2, Exterior of a valve. 



3 a. A email portion of the exterior lurface nagnifed. 



PI. 66, 



