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 rig-ht valve. The umbonal slope is more defined than represented in the figure. 
Chemung- group. Meadville, Pa. 
Prjecardium yenustum. 
Page 427. 
Figs. 18-20. Three valves showing- the prevailing characters of the species. 
Portage group. 
Shore of Lake Erie, Chautauqua Co., iV. Y. 
Fig. 21. A large right valve. 
Schoharie grit. 
Panenica dichotoma. 
Page 416. 
See Plate 94. 
Schoharie, N. Y. 
Panenica robusta. 
Page 424. 
Figs. 22-24. Two left valves and one right valve of this species, showing the characteristic form and surface 
ornamentation. 
Portage group. 
Below Portage, N. Y. 
Cardiopsis radiata. 
Page 433. 
Fig. 25. A right valve of this species. 
Kimlerhook group. Rockford, Iowa. 
