ejjATK l.XIX-Uontiuued. 



"PaNKXKA POTEN8. ' 



I'aifO 4Si. 



Fig. 8. Right side of n specimon showing: the form and surface charsiRte™. 



Haniilton group. Mailinon Co., N. ¥. 



Kig. 10. Tho loft side of a s]iecimeii retaining- both valves in conjunction. The right valve is erroneously 



represented a-s having a l)roa(l ligamental area. 



Hamilton group. ilad-Uum Coi, N. Y. 



I 



Pajjenka radians. 



Page <M. 

 Fig. 9. Left side of a sjiecimen i-etaining both valves. 

 Hamilton group. Cazeimria, N. 1'. 



Panenka abkupta. 



Piigc 423. 

 See Plate 94. 

 Fig. 11. Cardinal view of a cast of the intei-ior. 



Hamilton group. Cmtiherland, Md. 



Panenka Linokl*ni. 



Page 420. 

 Fig. 12. A right valve of ordinary size. 



Marcellus shale. Ontario Co., N. Y. 

 Fig. 13. A somewhat largei' I'ight valve of this species. 



Marcellus shale. Musion House, four miles south of Buffalo, N. Y. 

 Fig. 14. An unusually large left valve. 



Marcellus shale. Mission House, four miles south of Jitiffalo, N. Y. 



