90 CONCHOLOGIA CESTRICA. 



the ligament; beaks small, undulated; yellowish-brown, 

 with dark-green rays; nacre inclined to pale salmon 

 color; cardinal teeth double, sometimes trifid, long, 

 compressed, oblique. H. 1.25, W. 2.25, T. .8, inches. 

 Station, Schuylkill River, Chester County ; common. 



U. nasutus, SAY, Nich. Encyc., 1st Amer. Ed., 1816. 



If. nasutus. 



Fig, 186, 



Shell, thin, oblong, rounded before, rostrate posteri- 

 orly; fuscous, radiate with green, behind the middle; 

 beaks small, undulate ; within bluish-white ; cardinal 

 teeth small, oblique, crenate. H. 1.25, W. 2.6, T. .75, 

 inches. 



Station, Schuylkill River, Chester County. 



U. Fisherianus, LEA, Tr. Amer. Phil. Soct, VI., 1834. 



U. Fisherianus, 



Fig. 187. 



Shell, thin, compressed; beaks very near the anterior, 



