50 
Amnicola (Marstonia) walked Pilsbry 
Kimmewin lake. Amnicola walkeri appears to be rare or absent from 
most of the Canadian territory, excepting lower Ontario. The only record 
observed is that of Mozley from Victoria Beach , Manitoba. It is not noted by 
Dali. The present record indicates a wide distribution in central Canada. 
The specimens from Kimmewin lake show considerable variation, 
from the typical walkeri form to that with the spire depressed and the first 
two whorls coiled in the same plane, forming a somewhat decollated spire. 
As intergrading individuals occur it is to be classed as simply an individual 
variation, but if the variations became permanent and included all of the 
material it would constitute an environmental or ecological variety. 
Cincinnati cincinnatiensis judayi (F. C. Baker) 
Hamilton lake, common. The cincinnatiensis from northern Ontario, 
or Keewatin, appear to be referable to the variety first recorded from 
Winnebago lake, Wisconsin. The individuals are somewhat larger but are 
otherwise the same. This is the lake manifestation of the typical river 
form so abundant southward. Dali (1905, p. 118) records the species 
from Moose Factory, Hudson bay. These may have been the variety 
judayi, which appears to be the northern form of the species. No other 
record has been seen. 
Vancleaveia emarginata (Kiister) 
This species has been recorded from Moose Factory by Dali, from 
Manitoba in several places by Whiteaves and Hanham, and from Mac- 
kenzie River district by Whittaker. The emarginata of Mackenzie region 
has been differentiated as variety canadensis F. C. Baker (See Moll. Wis., 
I, p. 130), and it is probable that the other northern references are based 
on the same large form with open umbilicus. 
Amnicolidae, so abundant in species in the southern part of the United 
States, appears to be poorly represented in species in the north. Amnicola 
pallida Hald. is recorded by Dali and Hanham from Manitoba and Pomati - 
apsis lapidaria (Say) is recorded by Dali from Moose Factory, Hudson 
bay. These species should be found in northern and central Ontario. 
Family, Lymnaeidae 
Lymnaea stagnalis jugularis Say 
Marchington river, abundant. The specimens from this river show 
some variation in the arching of the upper part of the outer lip, but are 
otherwise typical. Recorded by Whiteaves from several places in Kee- 
watin and other parts of Canada. It is recorded from many places in 
Manitoba, in Mackenzie River district, and in Alaska. It is probably 
generally distributed over the boreal region. 
Lymnaea stagnalis lillianae F. C. Baker 
Hill, Blackstone, St. Joseph, Bamaji, Fitchie, Abram, and Cat lakes; 
Bamaji Lake outlet, on rocks in the rapids. Recorded by Mozley from 
Manitoba. It is probable that the stagnalis appressa recorded by V 7 hit- 
eaves from lake St. Joseph and other lakes in eastern Keewatin really 
belong to the variety lillianae, which was not differentiated when the 
