PLATE XLI. 



MODIOMORPHA rUTILLUS. 



J 'age 271. 

 Figa. 1, 2. Left and cardinal views of a cast. 



Schoharie grit. Sc/wharie, iV. Y. 



MODIOMOKPHA COMPLANATA. 



Page 27-2. 

 See Plate 34. 

 Fig. 3. The left side of a siieciraen pai'tially preserving' the surface markings. 

 Coniiferous limestone. Bal>cock\s hill, N. Y. 



MODIOMOKPUA Cl-AUENS. 



Page -273. 

 Fig. 4. A light valve. 



Corniferous limestone. Clare/ice Hullirw, N. Y. 



MODIOMORPHA 8UBALATA, Viir. ChEMUNOENSIS. 



Page 284. 



See Plate 39. 

 Figs. .5, 6. Ijcft and i ight valves. 



Lower Chemung group. Itliaca, iV. Y. 

 Pig. 7. A broa»ler foi-m with a convex ba.sal margin, doubtfully referred to this species. 



Lower Chemung gi-oup. Ithaca, N. Y. 

 Figs. 8, 9. Two specimens ii;taining both valves. 



Lower Chemung group. Ithaca, N. Y. 

 Fig. 10. A left valve. 



Lower Chemung group. Ithaca, iV. Y. 

 Fig. 11. A right valve, more elongate than the usual fonn. 



Lower Chemung group. Cortland Co., N. Y. 



Leptodesma complanatum. 



Page 227. 

 See Plate 22. 

 Fig. 12. A left valve an-anged on thi.-* plate by mistake. The position of the figure is obliciue, and the 

 decurving of the 8tri» along the hinge is not shown. 

 Chemung group. Steuben Co., N. Y. 



MODIOMORPHA NEGLECTA. 



Page 290. 

 Fig. 13. A right valve. 



Chemung group. Near Elmira, N. Y. 



