

UNIO OCHRACEI 



Pi 



DES 



oil el! I, thin 





 sen un> 

 uperior mar 



not oblique; umbo ml tenor exi 



igular; umboni; 

 jundly arcuate: phite, 



. 



A. i 



rosac 



SYNON 

 -eus, Say. Nich. Enc. (Am 



>; : 

 OBSE] 



common in the 



n& inhabits most tide s nori an- 



er. Variety A. is very abundant in Jai 

 irginia, where I found vast numb 



i -here by seines us- 



