PLATE LXXXVIII—Continued. 
Leiopteria Sayi. 
Page 162. 
Fig. 15. An imperfect left valve preserving very fine concentric lines. 
Hamilton group. Norton’s Landing, Cayuga lake, N. Y. 
lug'. I 6. The left valve of a specimen preserving both valves, showing the extent of the wing and general 
form of the she Ilf 
Hamilton group. Livingston Co., N. Y. 
Fig. 17. The right valve of a large specimen with the val'ves partially.opened. 
Hamilton group. Bellona, N. Y. 
Fig. 18 A left valve preserving the auricle and wing nearly entire. The body of the shell has been subjected 
to pressure and distortion in the soft shale and does not represent the true form and obliquity. 
Hamilton group. Bellona, N. Y. 
Fig. 19. An imperfect left valve as preserved in a coarse grit. 
Hamilton group. Leonardsville, Madison Co., N. Y. 
Fig. 20. A small left valve of considerable gibbosity. 
Hamilton group. Schoharie Co., N. Y. 
Leiopteria Greeni. 
Page 160. 
See Plate 20. 
Fig. -21. A large left valve. The figure is restored on the beak and anterior side. 
Hamilton group. Bellona, Yates Co., N. Y. 
Fig. 22. An imperfect flight valve. 
Hamilton group. Canandaigua lake, N. Y. 
Leiopteria Bigsbyi. 
Page 165. 
See Plate 20. 
Fig. 23. A small right valve referred to this species. 
Hamilton group. N. Y. 
Leiopteria Leai. 
Page 168. 
Fig. 24. A small left valve. 
Fig. 25. A larger imperfect left valve associated with the preceding. 
Hamilton group. Schoharie Co., N. Y. 
Leiopteria Mitchelli. 
Page 166. 
See Plate 20. 
Fig. 26. A large Imperfect left valve.as obtained from the impression of the exterior of the valve in the 
matrix. 
Hamilton group. Schoharie Co., N. Y. 
Leiopteria Rafinesquii. 
Page 161. 
See Plates 15 and 20. 
Fig - . 27. A nearly entire left valve showing the, form and the strong- concentric undulations. 
Hamilton group. Bellona, N. Y. 
Fig-. 28'. A right valve referred to this species. The specimen is imperfect at the beak and extremity of 
the wing. 
Hamilton group. Leonardsville, N. Y. 
Leiopteria linguiformis. 
Page 173. 
Fig. 29. A left valve, denuded of the test, showing the general form with the pallial line and muscular 
impression. 
Chemung group. North of Binghamton, N. Y. 
