PLATE 



XLIX. 



Pal^oneilo tenuistriata. 



Page 33B. 



See Plate 93. 

 Fig. 1. A light valve. 



Hamilton group. Shme of Seneca lake, N. Y. 

 Figs. 2, 3. Left side and cardinal view of a siiecimen of ordinary proportions. 



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

 Fig. 4. A right valve. 



Hamilton group. Shore of Skaneateles lake, iT. T. 

 Fig. 5. A left valve, proportionally somewhat longer than the preceding. 



Hamilton group. Shore of Skaneatdes lake, N. Y. 

 Fig. 6. A specimen i-etaining both valves, showing the surface markings and crenulations of the hinge. 



Hamilton group. JPra*Vs falls, Oiunidaga Co., N. Y. 

 Fig. 7. A right valve presei'\ing 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.  j. . 



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 scars and ci-eniilated hinge. 



Hamilton group. Shore of Lake Erie, N. Y. 

 11. A cast of the right side of a specimen retaining both valves, showing muscular scai-s, pallial line 

 and ci-enulated hinge. The two valves ai-e slightly displaced, making two lines of crennlationB. 



Fig. 



Figs. 12, 14. Two specimens which are proportionally wider th.an the prevailing fiinns 



Hamilton group. Near Cumberland, Md., and shore of Seneca lake, N. Y. 



.A«0>n-? <>JIM/<X*.JA.M 



■J <^ J >i; I ii'tj J'" 



.quOT^ -yuuin 



}%. 



