PLATE XLI. 
M O DIO MOR PH A P UTILLUS. 
Page 271. 
Fig-s. 1, 2. Left and cardinal views of a cast. 
Schoharie grit. Schoharie, IV. Y. 
Modiomorpha complanata. 
Page 272. 
See Plate 34. 
Fig. 3. The left side of a specimen partially preserving’ the surface markings. 
Corniferous limestone. Babcock’s hill, N. Y. 
Modiomorpha Cl arens. 
Page 273. 
Fig. 4. A right valve. 
Corniferous limestone. Clarence Hollow, IV. Y. 
Modiomorpha subalata, vnr. Chemunoensis. 
Page 284. 
See Plate 39. 
Figs. 5, 6. L eft and i ight valves. 
Lower Chemung group. Ithaca, N. Y. 
Fig-. 7. A broader form with a convex basal margin, doubtfully referred to this species. 
Lower Chemung' group. Ithaca, N. Y. 
Figs. 8, 9. Two specimens retaining- both valves. 
Lower Chemung group. Ithaca, N. Y. 
Fig. 10. A left valve. 
Lower Chemung group. Ithaca, N. Y. 
Fig. 11. A right valve, more elongate than the usual form. 
Lower Chemung-group. Cortland Co., ZV. Y. 
LEPTODESMA COMPLANATUM. 
Page 227. 
See Plate 22. 
Fig. 12. A left valve arranged on this plate by mistake. The position of the figure is oblique, and the 
decurving of the strise along the hinge is not shown. 
Chemung group. Steuben Co., IV. Y. 
Modiomorpha neglecta. 
Page 290. 
Fig. 13. A right valve. 
Chemung group. Near Elmira, N. Y. 
