PLATE XLIX. 
Pal^oneilo tenuistriata. 
Page 336. 
See Plate 93. 
Fig. 1. A right valve. 
Hamilton group. Shore of Seneca lake, N. Y. 
Figs. 2, 3. Left side and cardinal view of a specimen of ordinary proportions. 
Hamilton group. Pratt's falls, Onondaga Co., N. Y. 
Fig. 4. A right valve. 
Hamilton group. Shore of Skaneateles lake, N. Y. 
Fig. 5. A left valve, proportionally somewhat longer than the preceding. 
Hamilton group. Shore of Skaneateles lake, N. Y. 
Fig. 6. A specimen retaining both valves, showing the surface marking’s and crenulations of the hing-e. 
Hamilton group. Pratt's falls, Onondaga Co., N. Y. 
Fig. 7. A right valve preserving the surface markings and showing the crenulations of the hinge. 
Hamilton group. Pratt's falls, Onondaga Co., N. Y. 
Fig. 8. A right valve similar to the preceding. 
Hamilton group. Shore of Cayuga lake, N. Y. 
Fig. 9. An enlargement of the surface from the specimen fig. 2. 
Fig. 10. A cast of the interior of a left valve, showing- the muscular seal’s and crenulated hinge. 
Hamilton group. Shore of Lake Erie, N. Y. 
Fig. 11. A cast of the right side of a specimen retaining both valves, showing muscular scars, pallial line 
and crenulated hinge. The two valves are slightly displaced, making two lines of crenulations. 
Figs. 12, 14. Two specimens which are proportionally wider than the prevailing forms. 
Hamilton group. Near Cumberland, Md., and shore of Seneca lake, N. Y. 
