PLATE XCII. 



LiMOPTEKA CANCKLLAl A. 

 Page 244. 

 See Plate 26. 

 Fi^'s. 1, 2. Two small left valves differing- in the frequency of the radii. 



Hamilton group. Falls of the Ohio. 

 Fiff. 3. The left siile of the orifri""! specimen, redrawn to show the restored outliin', the pallia! liiu- and 

 niuscidar impression. 



Hamilton g-roup. Falls of the Ohio. 



LiMOPTEKA MACROPTERA. 



Page 246. 

 See Plates 24, 2G. 27, 28 and 29. 

 V\g. 4. A small g-ibbous left valve showing' numerous tine radii. 



Hamilton ^i-oup. Delphi, Onondaga Co., N. Y. 

 Fig.*. .1. fi. The right and profile vicw.s of a small specimen showing the form and convexity of the shell. 



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

 Fig. 7. An outline of a large right valve. 



Hamilton group. Schn/iarie Co., N. Y. 

 Fig. 8. A left \'alve preserving very marked surface charactei-s. 



Hamilton group. Delphi, N. Y. 

 Fig. 9. .\ light valve showing the marked radii on the unibonal region and their gradual obsolescence 

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

 ohlifpie lateral teeth and three obscure canlinal folds anterior to the beak. 

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



LiMOPTERA OBSOLETA. 



Page 249. 

 See Plates 2(3 and 2!». 

 Fig. 10. A large left valve, showing the form and surface charactei-s and a iiortion of the ligamental area. 

 Hamilton gron)!. Pratt's falls, Onondaga Co., N. T. 



