284 College of Forestry 
as late as November 25th, when the water was covered with 
ice. It was observed on reeds and rushes in water one to 
three feet deep, invariably from six to eight inches from the 
bottom, on the side of the reed facing deep water, the apex 
of the shell pointing downward. In this lake the colony of 
snails occupied an area of a few square rods, and the location 
of this area has not varied a hundred feet in either direction 
in ten years. Kirtland believes that it is a deep water species 
that migrates shoreward in the fall to spawn. Sargent noted 
Acella on lily leaves in the fall. . (F. C. Baker, 1911, pp. 
197-198). In the Georgian Bay region (p. 99) Acella is 
also found on the lower surface of lily leaves in sheltered 
bays. All records of the collecting of this species are in the 
fall and its location in Spring and Summer is not yet 
known. This fact indicates another reason for all the year 
round field work. 
Acella is known from but six localities in New York 
State: Strawberry and Squaw Islands, Niagara River; 
Mohawk River; Herkimer County; Little Lakes, Schuyler’s 
Lake, and Lake Canadarago, Otsego County. <A seventh 
locality may now be added, Oneida Lake, Oswego County. 
It will doubtless be found in other parts of the lake. Not 
listed by Beauchamp. 
Acella feeds upon green algee and has been observed on the 
following plants: 
Smith’s Bulrush (Scirpus smith). On stem. 
Floating Pond-weed (Potamogeton natans). On leaves and stem. 
White Water Lily (Castalia odorata). On leaves and stem. 
Yellow Water Lily (Nymphwa advena). On leaves and stem. 
Genus GaLBa Schrank. 
60. Galba catascopium (Say). Fig. 47, Nos. 2, 4-8. 
Observed at 24 stations, the habitat being usually an 
unprotected rocky point or bay, in one to four feet of water. 
It was commor on sandy bottoms, though mostly young or 
immature, and rare in protected situations. It was almost 
always associated with Goniobasis. At Isle Royale (p. 291) 
