I'LATK IJCXII— Continued. 



PAKACrCLAS ELLIPTICA. 

 Page 440. 

 See Plate 95. 

 Fig'. 23. The left side of a specimen. 



Comifei-ous limestone. Clcuretux, N. T. 

 Rg. 34. The right side of a cast. 



Comiferous limestone. Columbus, OJiio. 

 Figs. 26, 26. Left side and cardinal views of a specimen which is vertically compressed. 



Comiferous limestone. Leroy, N. Y. 

 Figs. 27, 28. The right side and cai-dinal view of the cast of the interior, showing muscular scars, pallial 

 line and ligamental grooves. 



Comiferous limestone. Cayuga, Ontario. 

 Fig. 29. The left side of a lai-ge specimen. 



Comiferous limestone. Western New York. 

 Fig. 30. The right side of a specimen, narrowed by compi-ession. 



Comiferous limestone. Leroy, N. Y. 

 Figs. 31-33. Left, right and cardinal views of an individual, retaining the shell and showing the surface 

 characters. 



Hamilton group. Fhlls of the Ohio river. 



Paracyclas ignota. 



Pago 444. 

 Fig. 34. A right valve of this species. 



Chemung gi-oup. Meadville, Pa. 



SOHIZODUS ? ri88A. 

 Page 447. 

 Figs. 35, 36. The right side and cardinal views of a cast of the interior. 



Schoharie grit. iSc/ioharie, N. Y. 

 Fig. 37. The right side of a compressed specimen. 



Schoharie grit. Schoharie, N. Y. 

 Rgs. 88-40. Right, left and cardinal views of a cast of the interior, showing muscular impressions. 



Schoharie grit. Schoharie, N. Y. 

 Fig. 41. The right side of a cast showing anterior and posterior muscular scars. 



Schoharie grit. Schoharie, N. Y. 



