PLATE LXXXII— Continued. 



Pterinopecten filitextus. 



Page 67. 



See Plate 17. 



Fig-. 9. A specimen showing the interior of the right valve and preserving the pallial margin of the left 



valve. Hamilton group. Onondaga creek, iV. T. 

 Fig. 10. An enlargement, to three diametei-s, of a portion of the surface of the specimen illustrated on plate 

 17, fig. 22. 



Hamilton group. F'rom a boiddei; Pine Valley, N. Y. 



Pterinopecten dispandus. 



Page 76. 

 Fig. 11. A right valve of this species. 



Fig. 12. A left valve. 



Chemung group. Mansfield, Pa. 



Pterinopecten nodosus. 



Page 60. 

 Fig. 13. The imperfect left valve described, showing the characteristic nodose radii. 

 Comiferous limestone. Ohio falls. 



Pterinopecten crenicostatus. 



Page 78. 

 See Plate 8. 

 Fig. 14. The specimen plate 8, fig. 4, I'edrawu and restored in outline to show the entire form and details 

 of surface charactei-s. 



Chemung group. Near Angelica, N. Y. 



Pterinopecten erectus. 



Page 77. 

 Fig. 15. A specimen with the upper portion of the left valve br(iken away, showing the interior of the 



right valve. 

 Fig. 16. A left valve of medium size. 

 Fig. 17. A large left valve. 



Chemung group. Itliaca, N. Y. 



Pterinopecten (Aviculopecten ?) strictus. 



Page 74. 

 See Plate 24. 

 Fig. 18. A left valve, associated with the right valve illustrated on plate 24. 

 Chemung group. Near Elmira, N. Y. 



Pterinea (Vertumnia) keproba. 



Page 106. 

 Fig. 19. A left valve. . 



Fig. 20. The convex right valve of a largei- individual than the jireceding. 



Chemung group. Ithaca, N. Y. 



Aviculopecten (Pterinopecten) invalidus. 



Pago 31. 

 See Plate 1. 

 Fig. 21. The left valve, fig. 18, plate 1, ilrawn of natural size, showing the true form and proportions. 

 Marcellus shale. Cherry Valley, N. Y. 



