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NkW YORK STATE MUSEUM 



I have just examined the shell, which is an undoubted female luteolus. 

 No. 85435 is a shell sent by Dr. James Lewis, from Mohawk, N. Y., 

 and in a note Mr. Lewis says: * The only living specimen I ever found 

 here.' " 



Note 5. 



Unio radiatus, Lamarck. — It is sometimes very difficult to distin 

 guish specimens of this species from Unio luteolus, but all the speci- 

 mens from this vicinity that I have seen have been typical U. radiatus 



Note 6. 



Unio nasutus, Say. — Aldrich remarks that many specimens of this 

 species are deformed. In a paper on "Some abnormal and pathologic 

 forms of fresh-water shells from the vicinity of Albany, N. Y.,"* Mr, 

 C. E. Beecher has described and figured an abnormal female specimen 

 of Unio nasutus taken from the canal at West Troy. The peculiarity 

 of this specimen is that the valves show plications produced by growth 

 over the gills while distended with fry. De Kay says: " Dr. Newcomb 

 has, I understand, detected in the Champlain canal a variety of this 

 species with a single tooth in the left valve. 



Note 1. 



Unio complanatas, Solander. — This is our most common species. 

 The color of the exterior varies from nearly black through various 

 shades of brown to bright green. Many specimens have brilliant rays 

 of yellow and green. Nacre purple or white. 



Deformed or abnormal specimens are common. In the paper referred 

 to under the preceding species, there are figures of four specimens of 

 Unio complanatus which show some marked peculiarity. 



Note 8. 



Say's types of this species were obtained from Norman's Kill. 



Note 9. 



Anodonta undulata, Say. — This species is not included in Aldrich's 

 list. He probably collected specimens of this species and named them 

 A edentula, a perfectly natural mistake, as the two species are scarcely 

 distinguishable. So far as known to me A. edentula does not occur in 

 this vicinity. 



* 36th Ann. Rept. State Mus. p. 51, pi. 2. 



