THE NAUTILUS. 139 
Amnicola limosa porata Say. Canal at Manayunk, uncommon ; 
lakes near Memorial Hall, Fairmount Park, common; Perkiomen 
Creek (Johnson). 
Amnicola granum Say. Ditch at Kaighn’s Point, N. J., rare; 
Corinthian Basin (John Ford). 
Gillia' altilis Lea. Common in Delaware and Schuylkill Rivers ; 
also canal at Manayunk; Westville, N. J. 
Pomatiopsis lapidaria Say. Delaware River near Westville, N. 
J.,common; near Strawberry Mansion (Vanatta). 
VIVIPARIDE. 
Lioplax subcarinata Say. Schuylkill River and Canal at Mana- 
yunk, common; Delaware River, very abundant. 
Campeloma decisum Say. Schuylkill River, and Canal at Mana- 
yunk, common; Delaware River, uncommon; Ponds near Point 
Breeze (Pilsbry). 
PLEUROCERIDE. 
Goniobasis virginica Gmel. Common in Delaware and Schuyl- 
kill Rivers; fine specimens at the mouth of Wissahickon Creek. 
Like many Goniobases, this species is dimorphic, the form with 
raised spirals (multilineata Say), occurring with the smooth speci- 
mens. 
CYRENIDE. 
Spherium striatinum Lam. Delaware and Schuylkill Rivers ; 
canal at Manayunk, common. 
Spherium sulcatum Lam. Cobb’s Creek (John Ford). 
Spherium fabale Prime. Canal at Manayunk, uncommon. 
Spherium partumeium Say. Greenwich Point, 8S. Philadelphia 
(McGinty). 
Spherium transversum Say. Mouth of Wissahickon Creek ; Dam 
in Tulpohocken Valley, Germantown, abundant; stream flowing 
from Lily pond near Memorial Hall (Vanatta); Westville, N. J. 
(Fox). 
Pisidium virginicum Gmel. Delaware River; canal at Mana- 
yunk, uncommon; Rancocas Creek, N. J. (Vanatta). 
Pisidium abditum Hald. Rock Run, uncommon; ditch at 
Kaighn’s Point, N. J.; stream flowing from Lily pond near Memo- 
rial Hall (V.). 
'Gillia in Mollusca has seyeral months priority over the same name in Pisces. 
