GEOGRAPHICAL DI8TBIBC TION OF NEW YORK TJNIONID^E 49 



ellipsis collected in the Niagara river. Specimens of Margari- 

 tana deltoidea from New York localities have been received from 

 James Delaney and Bev. John Walton. Messrs. Hinkley, Simp- 

 son and Marsh have reported specimens of Margaritana Hildre- 

 thiana from the vicinity of Buffalo, N. Y. 



Mr. Chas. T. Simpson has given me the following note con- 

 cerning Unio triangularis, a species included in the preliminary 

 list ? on the authority of Isaac Lea, as occurring in the Niagara 

 river: "Unio triangularis is in the Lea collection from Grand 

 Eapids, Mich., and in Lea record book one specimen presented 

 by T. C. Eobinson is credited to Buffalo, N. Y. I do not find 

 this shell, though it has been checked off as having been in the 

 collection when it was overhauled here." 



Bryant Walker has reported U. triangularis from several locali- 

 ties in the St. Lawrence drainage system in eastern Michigan, 

 and there is good reason to believe that the species inhabits the 

 St. Lawrence system in western New York. 



In the Bulletin of the Buffalo Society of Natural Sciences for 

 August, 1874, Dr. James Lewis published a list of the land and 

 fresh water shells of New York. Several species of Unionidae 

 were included in that list upon the authority of Coleman T. 

 Eobinson, as inhabiting western New York. At that time Mr. 

 Eobinson was the only one who had reported these species from 

 any locality in New York. Some of these species have since 

 been reported from New York localities by other collectors, and 

 I am disposed to believe that Mr. Eobinson's records are trust- 

 worthy. Speaking of Mr. Eobinson's list Dr. Lewis says : 

 "About thirteen years ago, assisted by Hon. G. W. Clinton, Mr. 

 W. W. Stewart and others, the late Coleman T. Eobinson (one 

 of the founders and early patrons of the Buffalo Society of Nat- 

 ural Sciences) compiled a list of species collected in the western 

 part of the State, principally in the immediate vicinity of Buffalo. 

 Mr. Eobinson's manuscript appears to be very faithfully com- 

 piled and leaves very little to be done to complete the work in 

 the part of the State to which it relates." In view of the fact 

 that Dr. Lewis considered Mr. Eobinson's records trustworthy, 

 and as several of those records have been confirmed by other 

 7 



