APRo 1895 
The Nautilus. 
VOL. VIII. 
APRIL, 1895. 
No. 12 
MOLLUSK FAUNA OF PHILADELPHIA AND ENVIRONS. 
BY MORRIS SCHICK. 
In the Proceedings of the Academy of Natural Sciences of Phila¬ 
delphia for 1861, page 306, Mr. W. M. Gabb has given a list of 
Philadelphia mollusks, enumerating 62 species, seven of which are, 
however, synonyms or doubtful inhabitants of this region. Having 
collected a number of species in this vicinity which are not on Gabb’s 
list, the writer thought it well to make a new one, giving exact locali¬ 
ties where the various species have been found during the last two 
or three years in the neighborhood of Philadelphia, and including 
not only those forms personally collected, but also the species and 
localities discovered by other local naturalists—Messrs. Walton, 
Vanatta, Stone, Pilsbry, McGinty, Johnson, Ford, Fox and Eisen- 
hardt, all of whom have contributed materially to the list. 
The importance of the Philadelphia fauna, as being the type lo¬ 
cality of many of Thomas Say’s species, will always render it 
of interest to those who study geographic variation ; and moreover, 
an accurate local list is of value to conchologists in the future, in 
determining the ever fluctuating geographic limits of species and 
varieties. While many of the special localities herein recorded 
will be destroyed by the growth of the city, others situated in Fair- 
mount Park, especially along the Wissahickon, will doubtless per¬ 
petuate within the city limits most of the species indefinitely ; and 
the aquatic forms will survive at least as long as the Schuylkill 
furnishes the water supply of the city. 
