Baker — The Molluscan Fauna of Western New York. 77 



19. Quadrula plicata Lesueur. Erie Canal. 



20. Quadrula undulata Barnes. Erie Canal. 



Genus Lampsilis Rafinesque. 1820. 



*21. Lampsilis gracilis Barnes. Erie Canal. 



22. Lampsilis iris Lea. 

 Unio novi-eboraci Lea. 



Station 10. Erie Canal (Walton). This species is very com- 

 mon and of large size at this locality. The variation in the 

 size and character of the rays is very great, some being per- 

 fectly straight while others are made up of square or oblong 

 dashes, making the rays broken ; the color varies from light 

 yellow to grass green. One specimen measures 76 mill, in 

 length. At one spot in the river these mollusks were found 

 piled up in a great heap among the rocks, showing where a 

 muskrat had partaken of a goodly meal. 



*23. Lampsilis nasutus Say. Erie Canal. 



24. Lampsilis luteolus Lamarck. 

 Stations 9, 10, 18 and 19. As is usual in this species, the 

 specimens before the writer show a great range of variation. 

 The individuals from station 10 are very solid, and are cov- 

 ered with a heavy deposit which renders them difficult to 

 clean, besides making them very unsightly. At this locality 

 they live in water from six inches to a couple of feet in depth, 

 buried in the soft mud, their siphons and the extreme poste- 

 rior part of their shell being the only parts of them visible. In 

 some spots they are so close together that their shells almost 

 touch. The sexes are very distinct in specimens from this 

 locality, much more so than those from the canal. The shells 

 from stations 9, 18 and 19 are smooth, polished and delicately 

 raved. A single specimen from station 18 has dark green 

 rays over a yellowish-green background. The entire collec- 

 tion shows a surface varying from perfectly plain to very 

 strongly rayed, and the rays vary from thread-like to very 

 wide. 



*25. Lampsilis ventricosus Barnes. Erie Canal. 

 Unio Occident Lea. 



