I'LATE LXXI— Cc.llUllucil. 



LUNULICAHOIUM CUUTUM. 

 I Pago 4S7. 



Pijf. 18. A left valve of this species. 



Hamilton jfi-oup. Near Tully, N. F. • 

 Fig. 19. An enlarjfenient of the pi-ece<ling to .show nioi-e clearly its characteristic features. 

 Fig. 20. A right valve of somewhat ilitfei-eiit form. 

 Fig. 21. An enlargement of the same. 



Hamilton group. Shore of Cay uya kih, y. Y. 

 Fig. 22. A right valve of a stnnewhat broader form. 



Mai-cellus shale. AUUn, Erie Co., N. T. 

 Fig. 23. An enlargement of the surface from the lower margin of the specimen fig. 18, showing its 

 pustulose character. 



LUNULICAEDIUM ORBICULARE. 



Pago &a. 

 Fig. 24. A left valve. 



Marcellus shale. Bloomfield, N. Y. 



LUNULICARDIUM ORNATUM. 

 Page 437. 

 Pig8. 25-27. Three valves showing the characteristic foifn of this species. The beak of fig. 26 is repre- 

 sented as too obtuse. 



Chemung group. Elmira, N. Y. 

 Fig. 28. A left valve. The radii are more flattened than represented in the figui-e. 



Portage g^i-oup. Cashaqiui creek, N. Y. 

 Fig. 29. An enlargement of the surface from the preceding. 



Fig. 30. A left valve, laterally compressed, producing an elongate form. The specimen is the original of 

 Pinnopiis acutinostra. 



Portage group. Casha/iva creek, N. Y. 

 Fig. 31. A right valve similar to the preceding. 



Chemung group. Near Elmira, N. Y. 

 Pig. 32. An enlargement from the surface of the specimen fig. 30. The summits of the rays are repre- 

 sented aa too concave. 



