PLATE XXXV. 



MODIOMOKPHA COXCENTKICA. 



Page 275. 

 :. '."-'^^'^kt-^' ^•'^ Plates 34, 36. 



Fig. 1. A right valve of a young individual showing a strongly lingular umboiial I'idge, a furrow along 

 the middle of the cardinal slope, and the antei'ior muscular impression. 

 Hamilton gi-oup. Delphi, N. ¥. 

 Fig. 2. A somewhat larger left valve of an individual presenting' characters similar to tlie pi-ecoding. 



Hamilton gi-ouji. filiore of Caijuya laki-, N. Y. 

 Fig. 3. Thi! right side of a large individual showing the arcuate forai characteristic of old individuals. 



Hamilton group. Schoharie Co., N. Y. 

 Fig. 4. A left valve of medium size of very short and broa<l fonn. 

 Hamilton group. Shore of Cayuga lake, N. Y. 

 Fig. 5. The interior of a left valve of a short and broad form, showing a strong tooth inider the beak, with 

 the anterior and posterior muscular scars and ci>nni'cting pallial line, 

 .m ^ Hanjilton group. Delphi, N. Y. 



MODIOMORPHA SDBALATA. 

 , , , Page 283. 



See Plate 39. 

 Fig. 6. A right valve of an unusually short and broad specimen. 



Hamilton group. Delphi, N. T. 

 Fig. 7. A right valve of unusually elongate form. 



Hamilton group. Delphi, N. Y. 



MomOMORPIIA PONDEROSA. 

 Page 271. 

 Sec Plate 34. 

 Fig. 8. The left side of a cast showing the form an<l muscular scars. 

 Coniiferous limestone. Clarence Hollow, N. Y. 



MODIOMOKPHA RECTA. 



I'liffe aSG. 

 Fig. 0. The nght side of a cast showing the muscular seal's and pallial line. 

 Hamilton group. Clarke Co., Ind. 



MODIOMORPHA SUHAN(iUL.\TA. 



Page 2S7. 

 Fig. 10. A Hght valve showing the anterior muscular scai'. 



Chemung group. Ma7i,<sfiel(l, Pa. 

 Fig. 11. A smaller i-ight valve showing the muscular scare. 



Chemung grcuip. Mansfield, Pa. 



