50 



NEW YOBK STATE MUSEUM 



collectors, I have deemed it proper to accept Mr. Kobinson's 

 records. Thus, U. anodontoides, U. elegans, Unio spatulatus, 

 U. trigonus, U. postulates and Margaritana cornplanata, which 

 were hypothetically included in the preliminary list, are retained 

 in this list, although they have not been reported to me from any 

 locality in New York, and their claim to be considered inhabi 

 tants of New York rests upon the lists published by Mr. Kobin- 

 son. In the case of U. trigonus additional evidence has been 

 supplied by Mr. Charles T. Simpson, who reports the species 

 as occurring fossil in the drift at Toronto, Can. (Proc. U. S. 

 Nat. Mus. p. 593, 1893.) 



There is some confusion concerning U. pustulatus and U. pus- 

 tulosus. Simpson (Loc. cit.) reports U. pustulosus as occurring 

 fossil at Toronto. 



Prof. P.. Ellsworth Call suggests that Unio hippopaaus si is a 

 depauperate Unio undulatus or U. plicatus, Le S." The New 

 York State Museum collection contains a specimen of Unio hip- 

 popaBUS from Buffalo, N. Y, which is certainly referable to U. 

 undulatus. The shell described under the name of hippopseus 

 has not been generally recognized by collectors, and its distri- 

 bution seems to be limited to the neighborhood of Buffalo, 

 N. Y. 



I consider the following names synonymous, and have treated 

 them as such in this paper : 



Unio Novi-eboraci, Lea = Unio iris, Lea. 



Unio patulus, Lea = Unio clavus, Lamarck. 



Anodonta subcylmdracea, Lea = Anodonta Ferussaciana, Lea. 



Unio laevissimus and Anodonta gigantea are not entitled to be 

 considered inhabitants of New York. The specimens, upon 

 authority of which these two species were included in the pre- 

 liminary list, were probably incorrectly identified. 



No additional evidence in support of De Kay's statement that 

 Anodonta pavonia inhabits New York has been received. The 

 same is true of Anodonta plana, unless it be considered synony- 

 mous with Anodonta decora, which Mr. Chas. T. Simpson reports 

 in the Lea collection from Mohawk, N. Y., and from Buffalo, 

 N. Y. 



