GASTROPODA— AP0RRHAID7E. 



75i 



Nanaimo formation of Vancouver and Martinez. 

 492. A. rostrata Gabb. (Fig. 1090.) Cretacic. 



Apical angle about 35 ; early whorls round with slightly im- 

 pressed suture and obliquely forward-curving, round and close-set 

 ribs ; body whorl with ribs more distant and becoming obsolete ; 

 lip broadly expanded, upper angle somewhat produced. 



Ripleyan formation of New Jersey, Mississippi, Texas. 



Fig. 1089. Anchura exilis, enlarged. 

 (After Gabb.) 







Fig. 1090. Anchura rostrata. 

 (After Whitfield.) 



493. A. pennata (Morton). (Fig. 1091.) Cretacic. 



Larger and with sharper and more distant ribs on the younger 



whorls, obsolete on body whorl ; lip with two upper corners more 



v. 



Fig. 109 1. Anchura pennata. (After 

 Whitfield. ) 



Fig. 1092. Anchura abrupta. 

 After Whitfield.) 



strongly prolonged upwards. Internal molds with deep sutures. 



Ripleyan of New Jersey and Alabama. 

 494. A. abrupta Conrad. (Fig. 1092.) Cretacic. 



Whorls more rounded than preceding ; ribs like those of A. 

 rostrata, but fainter ; a faint spiral sculpture, becoming an angula- 

 tion on body whorl and lip. 



