136 
THE NAUTILUS. 
Pyramidula striatella Anth. West Park, common ; Wissahickon, 
common ; Westville, N. J., one specimen ; near Strawberry Man¬ 
sion, where, in Nov., 1893, they were found congregated in immense 
numbers (Vanatta). 
Pyramidula ( Helicodiscus ) lineata Say. Lansdowne Valley, un¬ 
common ; Wissahickon, a few specimens; near Strawberry Mansion 
(E. G. Vanatta) ; Germantown (R. Walton ; Stone) ; near 58th St. 
Station, P. W. & B. R. R. (Pilsbry) ; “ Found by Robert E. Griffith, 
near Philadelphia.” (Say.) ; Westville, N. J. (Fox). 
HELICIDiE. 
Polygyra ( Triodopsis) thyroides Say. West Park, common ; Wis¬ 
sahickon, common ; Westville, N. J., common ; Monument Ceme¬ 
tery (E. G. Vanatta) ; Fisher’s Station, Germantown, and Fern 
Rock (Stone). 
Polygyra ( Triodopsis ) albolabris Say. Wissahickon; Laurel 
Hill Cemetery ; Perkiomen (Johnson) ; Fern Rock, rare (Stone) ; 
Westville, N. J. (Fox). 
Polygyra (Triodopsis) tridentata Say. Wissahickon, moderately 
common. 
Polygyra ( Triodopsis ) tridentata juxtidens Pils. West Park, and 
Laurel Hill Cemetery, common. 
Polygyra (Triodopsis ) fallax Say [FT. introfevens Bid.]. Flat 
Rock Dam, rare (R. Walton) ; Monument Cemetery, rare (E. G. 
Vanatta) ; Atco, N. J. (Fox) ; “ Presented to the Academy by 
Messrs. Hyde and Mason who found it in the vicinity of Philadel¬ 
phia where it is not uncommon.” (Say.) 
Polygyra ( Stenotrema ) hirsuta Say. West Park, uncommon ; 
near Strawberry Mansion (E. G. Vanatta) ; Perkiomen (Johnson). 
Polygyra (Stenotrema ) monodon Rack. Strawberry Mansion (Ford); 
Perkiomen (C. W. Johnson). 
Vallonia pulchella excentrica Sterki. Ruins near School Lane, 
common; Falls of Schuylkill (E. G. Vanatta) ; Fisher’s Station, 
Germantown, common (Stone). 
Vallonia costata Miill. East bank of Schuylkill, at Flat Rock 
Dam, very common ; Falls of Schuylkill (E. G. Vanatta). 
PTJPIDJE. 
Pupa armifera Say. Ruins near School Lane, common ; Falls of 
Schuylkill (E. G. Vanatta). 
