ri.ATK I.XXXIV— Continueil. 



ACTINOPTERIA AUUICULATA. 

 rage 121. 

 KifT. 1"). Tho left valve descrilied showing' the larg-c anterior ear. 



Chemung group. TjawreneeinUe, Tioga Co.. Pn. 



ACTIXOX'TERIA BOYDI. 

 I'agc 113. 

 See Plate 19. 

 Fig. 111. The left valve of the siiecinion fig?. 20, 2S, 29. plate 19. redva\vii to show the jiallial line ami 

 muscular impressions. ' ' ' ■" " 



Hamilton group. Cazeiutvia, iV. Y. 

 Fi". 17. A small right valve showing the hinge characteiTi, pallial line and muscular impression. Thus 

 figure is the natural size of the specimen represented in figure 12, plate 19. 

 Hamilton group. Hamilton, Madison Co., iV. T. 



AciIx\"Oi"XKi:iA XIIKXA. 

 Page 12.'j. 

 Figs. 18. 19. The right and left valves of the specimen described. 

 Chemung group. Ithaca, iV. ¥. 



ECTENODESMA BIKOSTRATUM. 



Page Hi. 

 See Plate 23. 

 Fig. 20. The left valve represented on plate 23, fig. 30, recb-awn to show the extent of the wings. 

 Chemung group. FranMin, Delaware Co., N. Y. 



Ptekinea Cuemungensls. 



Page 98. 

 See Plate 16. 

 Fig. 21. A large left valve of this species showing the form of the shell and the iriterruptejl rays with the 

 fine conceutinc strire of the surface. 



Chemung group. Near Bath, N. Y. 



Pterinea interstkialis. 



Page 96 

 Fig. 22. An imperfect left valve. 



Chemung group. Chemung iVoiroms, iV. Y. 



Ptekinea coksimilis. 



Page 100. 

 See Plate It!. 

 Fig. 23. A left valve showing the ligamental area, cardinal and lateral teeth, pallial line and muscular 

 impression. Some portions of the test are i-emaining on the lower half of the valve. 

 Chemung group. Tioga Co., JS". Y. 



PtERINEA (VeUTUMMAJ lIEVElitA. 



I'iige 101. 



See Plate 24. 



Fig. 24. The specimen represented on plate 24, fig. •>, redi-awn to show the absence of strong rays on the 



wing. 



Chemung group. Elmira, N. Y. 



