PELECYPODA—PRIONODESMACEA. 



487 



Fig. 650. a, Aviculopecten duplicates, left valve ; b, A. princeps, left valve ; c, A. 

 caroli, left valve ; d, A. striates, left valve ; e, A. cancellalus, right valve, X 2 '■> f> 

 A. scabridus, left valve; g, A. fasciculatus, left valve. (Pal. N. Y. , V.) 



ears covered with numerous, fine and irregular rays which are 

 often fasciculate or in diverging bundles. Distinguished from other 

 species by its irregular surface markings. 



Hamilton : New York, Indiana. 

 334. A. princeps (Conrad). (Fig. 650, b.) Devonic. 



Large ; rays nearly obsolete on the large ears. Whole shell 

 covered with fine concentric striae. 



