THE CHICAGO ACADEMY OF SCIENCES. 
Se) 
Or 
Cas) 
3RITISH AMERICA. 
Ontario: Pic Lake, Thunder Bay District (Agassiz; Dall; Gould) ; Lake 
Superior (Gould); Ottawa, Carleton Dist. (Latchford; Taylor). 
GEOLOGICAL DisTRIBUTION: Unknown. 
Ecotocy: In Tomahawk Lake, Wisconsin, this species lives in 
swampy or quiet bays or pond-like bodies of water connecting with 
the lake. In quiet bays it may be found rarely on the sandy shore 
in shallow water. Its more usual habitat is in swampy areas where 
there is a quantity of vegetation such as Typha and the pond scums, in 

Distribution of 
GALBA LANCEATA 
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Fic. 41. 
which situation it may be found on floating logs or in the vegetation. 
In this region it is typically an inhabitant of swampy, Typha bordered 
bogs, in which there is an accumulation of old logs. 
Remarks: Lanccata is one of the Lymnzeas which has been much 
misunderstood for many years. By several authors it has been con- 
sidered a synonym of kirtlandiana and exilis, Dr. Dall in his excellent 
report on Alaska Mollusks, page 72, refers it to kirtlandiana as an 
immature form, An examination of a cotype in the Smithsonian col- 
lection, and a study of Gould’s figures and descriptions, aided by a 
collection of over one hundred specimens from the northern states 
shows that it is a good species. It is true that Binney’s figure is very 
poor, but the two figures in Agassiz’s Lake Superior (pl. 7, figs. 8 
