134 
THE NAUTILUS. 
The we«t bank of the Schuylkill above Girard Avenue was a 
very good collecting ground, where one could find in good numbers 
Polygyra hirsuta, P. thyroides, P. tridentata juxtidens , Pyramidula 
alternata, Gastrodonta ligera, G. suppressa, G. nitida, Vitrcea ar- 
borea, and Selenites concava, with a few others not so common ; but 
this place has been destroyed this year by the laying out of a drive. 
On the land shells of the park, see Ford, Conchologists’ Exchange, 
II, p. 7. 
In his list Mr. Gabb refers to Helix labyrinthica as common near 
Germantown ; I have been able to find but three specimens of this 
species, after a dilligent search of three seasons. He also mentions 
H. hirsuta as one of our commonest species, but this is now also un¬ 
common ; while others are becoming rare, there are some species 
now quite common that are not mentioned in Mr. Gabb’s list, such 
as Limax maximus, Pyramidula striatella, Vallonia costata, Papa 
contracta, Succinea obliqua, Splicerium striatinum, S. transversum, etc. 
Helix egena Say, a depressed form of Conulus fulvus, was described 
from ten miles above Philadelphia ; and C. chersina=fulvus is re¬ 
ported in Gabb’s list as found near Germantown by Tryon. It has 
not occurred to recent collectors. 
Helix appressa, admitted by Gabb, on the evidence of one speci¬ 
men found on E. K. Tryon’s estate near Germantown, was evidently a 
lost cabinet specimen. Amnicola lustrica Say of Gabb’s list is the 
half grown Pomatiopsis lapidaria. “ Margaritana rugosa Say,” is 
an evident pen error for M. marginata Say, which Gabb omits. 
Unio jisherianus reported from the Schuylkill above Girard Avenue 
bridge, one specimen, may have been an incorrect identification. 
TESTACELLIDJE. 
[Testacella maugei Fer. Green house on School Lane, German¬ 
town.] 
SELENITIDJE. 
Selenites concava Say. Both banks of Schuylkill at Falls, and 
below; everywhere rare. 
LIMACIDiE. 
[Limax maximus L. West Philadelphia and Darby, plentiful in 
cellars and green houses (Pilsbry) ; Wissahickon, uncommon; 
Laurel Hill Cemetery, common ; Germantown (Vanatta)]. 
Note. —Introduced species are enclosed in brackets The authority cited 
for each special locality refers to that immediately preceding only, but many 
of the places have been visited by several collectors. 
