PLATE XLVIII—Continued. 
Palteoneilo constricta, var. flexuosa. 
Page 334. 
Figs. 17-20. A series of specimens illustrating this variety of form. 
Lower Chemung group. Near Ithaca, N. Y. 
Pal^oneilo plana. 
Page 334. 
Figs. 21-23. Three valves preserving the surface markings on the body of the shell and showing the crenu- 
lations of the hinge, enlarged. 
Fig-. 24. A cast of the interior showing the crenulations of the hinge, enlarged. 
Hamilton group. Tinker's falls, Onondaga Co., N. Y. 
Fig. 25. A cast of the interior of a left valve preserving muscular imprints and hinge crenulations, enlarged. 
Hamilton group. Butternuts, Otsego Co., N. Y. 
Fig. 26. A gutta-percha impression of the preceding, enlarged. 
Fig. 27. A cast of a left valve faintly showing the surface striae and the anterior muscular scar, enlarged. 
Hamilton group. Shore of Canandaigua lake, N. Y. 
Fig. 28. A left valve presenting a slight variation in form, preserving the surface striae and showing the 
crenulations of the hinge, enlarged. 
Lower Chemung group. Ithaca, N. Y. 
PALiEONEILO maxima. 
Page 335. 
Figs. 29, 30. Two left valves preserving the surface striae. 
Hamilton group. Schoharie Co., N. Y. 
Fig. 31. The right side of a cast of a specimen showing the large posterior muscular scar. 
Hamilton group. Schoharie Co., N. Y. 
Fig. 32. A left valve showing an unusual elevation of the umbo from compression. 
Fig. 33. A right valve showing a greater height than usual. 
Hamilton group. Fultonliam, N. Y. 
Fig. 34. The cardinal view of the specimen fig. 31. 
Fig. 35. An unusually short and broad right valve. 
Hamilton group. Shore of Cayuga lake, N. Y. 
Fig. 36. The left side of a specimen preserving the two valves in conjunction. 
Hamilton group. Shore of Cayuga lake, N. Y. 
Figs. 37, 38. Enlargements of hinge structure. The crenulations are erroneously represented, especially in 
fig. 37. 
Palasoneilo elongata. 
Page 345. 
See Plate 93. 
Fig. 39. A left valve showing the tine stria of growth, enlarged to two diameters. 
Chemung group. Philipshurgh, N. Y. 
