PLATE XCII. 



LlMOPTERA CANCELLATA. 

 Page 244. 

 See Plate 26. 

 Pigs. 1. 2. Two small left valves differing in the frequency of the radii. 



Hamilton group. Falls of the Ohio. 

 Pig. :;. The left side of the original specimen, redrawn to show the restored outline, the pallial line and 

 muscular impression. 



Hamilton group. Falls of flu Ohio. 



LlMOPTERA MACROPTERA. 



Page 246. 

 See Plates l'4. 26, 27, 28 and 29. 

 Fig. 4. A small gibbous left valve showing numerous tine radii. 



Hamilton group. Delphi, Onondaga Co., X. Y. 



Fiffs, 5, 6. The right and profile views of a small specimen showing the form and verity if the sholl 



Hamilton group. Pratt's falls, Onondaga Co., 2V. Y. 

 Pig, 7. An outline of a large right valve. 



Hamilton group. Schoharit Co ■ X. Y. 

 Fig. 8. A loft valve preserving very marked surface characters. 



Hamilton group. Delphi, N. Y. 

 Fig. 0, A right valve showing the marked radii on the umbonal region and their gradual obsolescence 

 toward the margin of the valve. The hinge preserves the striated ligamental area, the 

 oblique lateral teeth and three obscure cardinal folds anterior to the beak. 

 Hamilton group. Pratt's falls. Onondaga Co., N. Y. 



LlMOPTERA OBSOLETA. 



Page 249. 



See Plates 26 and 29. 



Fi^-. 10. A large left valve, showing the form and surface characters and a portion of the ligamental area. 

 Hamilton group. Pratt's falls, Onondaga Co.. N. Y. 



