PLATE LXX— Continued. 



Pararca ERECTA. 

 Page 432. 

 See Plate 94. 

 Fig. 16. A left valve. 



Waverly group. Meadville, Pa. 



Pararca Sao. 



Page 430. 

 Fig. 17. A right valve. The umbonal slope is more defined than repi-esented in the Bgure. 

 Chemung gi"oup. Meadville, Pa. 



Pr.s:cardium venostum. 



Page 427. 

 Figs. 18-20. Thi-ee valves showing the prevailing chai'acters of the species. 



Portage group. Shore of LaJce Erie, Cliautauqtui Co., N. ¥. 



Panenka dichotoma. 



Page 416. 

 See Plate 94. 



Fig. 21. A large right valve. 



Schoharie grit. Schoharie, N. Y. 



Panenka robusta. 



Page 424. 

 Figs. 2^-24. Two left valves and one right valve of this species, showing the characteristic form and surface 

 ornamentation. 



Portage group. Below Portage, N. Y. 



Cardiopsis eadiata. 



J'age 433. 

 Pig. 2.'). A right valve of this species. 



Kinderhook group. Jtocltford, Iowa. 



