PLATE XCIlI-Contlnaed. 



Grammysia UNDATA. 



V&ge 379. •• 



See Plates 61, (i4. 

 Fijf. 21. A U'fl valve. 



Chemnng group. Near Olean, Al T. 



Gkammysia ovata. 



Page 358. 

 Fig. 22. A specimen retaining both valves in conjunction. 

 Corniferous limestone. Delavxire, Ohio. 



Grammysia duplicata. 



Pago 380. 

 Fig. 23. A right valve showing surface ornamentations. 



Chemung group. U'arre?!, Pa. 

 Fig. 23a. A profile of the preceding. 



Grammysia glabra. 



Pig. 24. A partial cast of a left valve showing the muscular scars and lines of gi-owth. 

 Chemung group. Warren, Pa, 



Grammysia bisdlcata. 



I'age :J59. 

 See Plates 54, 56. 

 Pig. 25. A right valve showing strong concentric umlulations of the surface and fine radiating stne. 

 Hamilton group. Albany Co., N. Y. 



Grammysia subarcuata. 



Page 373. 

 See Plate 61. 

 Fig. 26. Anterior view of a specimen showing a very strongly developed lunule. 

 Chemung group. 



Grammysia arcuata. 



Page S73. 

 See Plates 61, 63. 

 Fig. 27. The left side of a specimen showing concentric undulations. 

 Hamilton group. Pratt's falls, N. T. 



EUTHYDESMA SUBTEXTILE. 

 Page 38.^. 

 See Plate 63. 

 Pig. 28. The hinge of a left valve showing the straight ligamental area. 

 Pig. 29. An enlargement of the surface from another specimen. 



Portage g^-oup. Near Portland Harlxir, Chatitaitqua Co., iV. T. 



