Geographical Distribution of New York 

 Unionidae. 



In Bulletin Number 1 of the New York State Museum, March, 

 1892, the writer published a preliminary list of species of 

 Unionidae inhabiting the State of New York. The following 

 extracts from the introduction to the preliminary list will serve 

 to show the objects for which the list was published, and the 

 authority upon which each species was entitled to be considered 

 an inhabitant of the State. 



" Unless otherwise stated all the species in the following list 

 are represented in the collection of the New York State Museum 

 by specimens from localities within the limits of the State of New 

 York or from the Allegheny river at Warren, Penn., just south 

 of the New York boundary. A name printed in italics indicates 

 that the species has been included without positive evidence that 

 it inhabits New Y^ork. 



" This list has been prepared for distribution among concholo- 

 gists with a view to obtaining data bearing upon the geographical 

 distribution of the UnionidaB inhabiting the State of New York." 



Kecipients were requested to furnish the writer with all 

 information in their possession regarding : 



" 1. The general distribution of each species. 



" 2. The distribution of each species in the State of New York. 



" 3. The causes which tend to restrict or extend the habitat of 

 each species in the State of New York. 



" 4. The reasons why there are numerous species in the waters 

 of the western part of the State and few species in the waters of 

 the eastern part." 



The present paper will consider the first two questions only, 

 leaving the last two for future consideration. 



The preliminary list contained forty-eight species on the 

 authority of the New York State Museum collections, two species 

 on the authority of De Kay (Zoology of New York), three species 



