LYMNZIDZ OF NORTH AMERICA. 369 
Type: Academy of Natural Sciences, Philadelphia, Pa., one speci- 
men, No. 58519. 
Tyre Locatity: Mountain lake, California. 
ANIMAL, JAW, Rapura and GENITALIA: Not examined. 
Rance: (Figure 39) California to Wyoming, north to southern 
Alberta. A species characteristic of the Upper Austral Transition and 
Boreal (Canadian) life zones and of the Californian, Coloradoan and 
Hudsonian regions. A careful search will doubtless fill the vacant 
territory between Wyoming, California and Alberta. 
RECORDS. 
UniTep STATES. 
CALIFORNIA: Oakland and Berkeley, Alameda Co. (Cockerell) ; mountain 
lake near San Francisco, San Francisco Co. (Hemphill; Rowell; Tryon; Wood) ; 
Santa Clara Co. (Stearns). 
Wyominec: Black Rock Butte, Sweetwater Co. (W. C. Knight; Walker). 
BriTISH AMERICA. 
AxBerRTA: Banff (Bos. Soc. N. H.). 
GEOLOGICAL DistRIBUTION: Unknown. 
Ecotocy: Not recorded. 
REMARKS: Traskiti may be known by its short spire, very large, 
rotund body whorl and distinct umbilical chink. The inner lip is 
broadly reflected and without a distinct plait, resembling in this re- 
spect such species as cubensis, galbana, etc. It is this resemblance 
which has led some conchologists to place trasku in the synonymy of 
galbana, an erroneous disposition as it is clearly a member of the 
subgenus Stagnicola and is closely related to proxima, which occasion- 
ally has a raised inner lip and a small chink. The flat, smooth ex- 
pansion of the inner lip is not always a safe guide as this occurs in 
typical palustris (from Colorado) as well as in certain species of the 
emarginata group, which are undoubtedly members of the subgenus 
Stagnicola.* 
The study of Tryon’s type and of the material in Philadelphia, 
Washington and in certain private collections, renders it apparent that 
traskii is a distinct species and not a variety of proxima as thought 
by Tryon. No specimens have been seen which connect the two 
species although they occupy the same territory. The sudden en- 
largement of the body whorl, the wide, smooth imner lip, the con- 
spicuous umbilical chink, and the short, almost shouldered spire, are 
characteristics which separate traskiui from proxima. Von Martens 
cites the species from Alaska, but this record needs confirmation. 
1An examination of the radula will at once settle the question of its 
proper position, Stagnicola having bicuspid laterals while the group of which 
galbana is a member has tricuspid laterals, 
