130 



In citing authorities for local clistrihution the name of the person 

 quoted refers to the locality associated therewith in the above lists, 

 unless otherwise indicated. 



It had been hoped that the results of contemplated explorations 

 in the head waters of the Ohio in Western New York might have 

 been reached in season to contirm and extend the list of species 

 here presented. Though this hope is unfortunately deferred, it is 

 scarcely to be expected that more than a very few species would 

 have been reached not already known to belong to this State. It 

 is, however, prohahle, that an undescribed species of Uriio occurs in 

 the outlet of Chautauqua Lake ; and that one, perhaps two species 

 of PomatiojJsis, may be found in some of the western counties. 

 Hopes are entertained that certain species of land shells somewhat 

 indefinitely credited by Binney and Bland to this State, may be 

 found within its limits; no other record of them is available for 

 present purposes. Though this paper has been made as comprehen- 

 sive as could be expected from the material available, it is probable 

 that species have been omitted which are known to others to belong 

 to the fauna of New York. At some future day, perhaps, the Sta^e 

 of New York may authorize a revision of the work already pub- 

 lished under its patronage on this subject. When this work shall 

 be decided upon, the value of this and other similar papers will be 

 at once apparent. 



GASTEROPODA PULMONATA. 



Suborder Geophila. 



Family HELICIDAE. 



Subfamily VITRININAE. 



YITRINA, Drap. 

 V. limpid, Oould. Aldricli ; Lewis. 



HELICODISCUS, Morse. 

 H. lineatus, Say. Aldricli ; Brown ; Ingalls ; Lewis. 



