PLATE XLIX— Continued. 



Pal^eoneilo FECUNDA. 



Page 3Se. 

 Figs. 13, 15-17. Figures illustrating the usual forms in this species. 

 Fig. 18. A right valve of shorter form. 



Hamilton group. Near Ouinberland, Md. 

 Fig. 19. The right .side of a cast of the interior, showing the muscular scars, pallial line and ci-enulated 



hinge. Hamilton gi-oup. Near Cumberland, Md. 

 Fig. 20. The left side of a specimen similar to the preceding. 



Hamilton group. Near Cumberland, Md. 

 Fig. 21. A gutta-percha impression from the 8})ecimen fig. 20. 

 Rg. 22. An enlargement of a part of the hinge, from the pi"eceding. 

 Fig. 23. An enlargement of the surface strite, from the specimen fig. 18wi-j iii>jlii 

 Fig. 24. The canlinal view of a cast of the interior, showing the ci"enulated hinge and muscular scars.. j,'| 



Hamilton group. Near Cuml)erUind, Md. 



PAL.EONEILO MUTA. 



■.Villi! ■':)! t.l HlloitBiun-' 



PBg« 337. 



Figs. 25, 26. Two valves presenting the oi-dinary form of the smaller individuals. 



Hamilton group. Bellona and shore of Canandaiffua lake, N. Y. 

 Fig. 27. A left valve of more elongate form. 



Hamilton grpu];). Shore of Seneca lake, N . Y. 

 Fig. 28. A right valve. 



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

 Figs. 29, 30. Left and right valves of large individuals. 

 Fig. 31. A left valve of unusually short fonu with the concentric lamellse very strongly developed. 



Hamilton group. Shore <f Skaiieateles lake, N. Y. 

 Fig. 32. An enlargement of the surface, from the preceding. 



PaL^ONEILO FIL08A. 

 Page 343. 

 Figs. 38-38. A series of right and left valves preserving the usual form of this species. 

 Lower Chemung group. Near Ithtua, N. Y. 



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