I'l.ATK I-XVIl— Continued. 



CONOCAKIMUM CUNEt'S. 

 rage 40a. 

 .See Platvs H8, <t4. 

 Fig. 21. The right side of 11 crii.«he(l sjH!cinu'n. 

 Ki(f. 22. An enlai-yeiiii-iit cf the surface from the jn-eceiling;. 



Schoharie grit, l^c/ioharie, N. Y. 

 Fiff. 23. An iuijierfeft partial cast of ii left valve, showing Ihc !il>sc'iic(' of radii on thf surface of the test, 

 and the strong radii on the interior of the shell 



Schoharie grit. Knox, Albany Co., iV. T. 

 Figs. 24-26. Ventral views of three 8i>e<nnienH, showing tiie dtiplictation of the radii towai-dsthe margin, and 

 the extension of the shell beyond the unibonal ridge. 

 Sohoharie grit. Albany Co., iV. Y. 

 Fig. 27. The posterior view of a specimen showing the expansion of the shell around the periphery of the 



umbonal ridge. 

 Fig. 29. The ventral aide of a sjiecimen from which the shell is exfoliated. 



Schoharie grit. Schoharie, N. Y. 

 Figs. 30, 31. The left sides of two casts of the interior. 

 Schoharie grit. Schoharie, N. Y. 

 Fig. 32. The ventral view of a specimen. 



Schoharie grit. Albany Co., N. Y. 



CONOOABDIUM CUNEU8, VUr. TRIQONALE. 



Page 410. 



See Plates 68, 94. 



Fig. 28. Ventral view of the original specimen, which is a partial cast of the interior, retaining portions 



of the test along the margins. 



Corniferous limestone. Canada West. 



