U. S. NATIONAL MUSEUM 



PROCEEDINGS, VOL. 52 PL. 7 



Harpacanthus procumbens, Erismacanthus maccoyanus, Dicrenodus texanus, 

 Saurspterus taylori, Coccosteus, species, Ctenacanthus gracillimus, and 

 psammodus plenis. 



For explanation of plate see page 299. 



