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Menetus exacuous (Say) 
Cat, Bamaji, and Kimmewin lakes. Typical of the species. Recorded 
by Whiteaves from Knee lake; by Dali from Moose Factory, Hudson bay; 
by Mozley from Minaki, Winnipeg river. It is known from various places 
in Manitoba and adjacent territory. 
Menetus exacuous megas (Dali) 
Cat and Fitchie lakes. Recorded by Dali from Birtle, Man., its type 
locality. The “pinched” character of the periphery, a diagnostic feature, 
is well shown in the Keewatin specimens. 
Gyraulus deflectus obliquus (De Kay) 
Cat, St. Joseph, Kimmewin, and Bamaji lakes; Knife lake in swale. 
It is probable that some of the references by Whiteaves and others from 
Keewatin and other parts of central Canada are referable to this race of 
deflectus rather than to kirsutus , under which name they are listed. Whit- 
eaves’ records of Planorbis albus (hirsutus) from lakes St. Joseph and 
Wapikopa, Kawinogans and Attawapiskat rivers, and mouth of Albany 
river near Fort Albany may include or refer to obliquus, the rounded 
periphery easily confusing it with hirsutus. Mozley lists deflectus from 
Manitoba and also kirsutus from the same region. The distribution of 
hirsutus in Canada is imperfectly known. Whittaker’s record for Mac- 
kenzie river appears authentic, specimens having been examined. 
Gyraulus arcticus (‘Beck’ Moller) 
Kimmewin, Bamaji, Cat, St. Joseph, Hamilton, Kapikik, Pashkoko- 
gan, and Fitchie lakes. 
Gyraulus arcticus appears to be the common small planorbe of the 
northern part of the United States and of Canada. All of the material 
in the collection is referable to this form which has been correlated with the 
Greenland species described by Moreh in the Journal of Conchology (See 
also Baker, Moll. Wis., I, p. 230). It differs from parvus in its rounded 
basal whorls, which are not excavated. Arcticus is cited by Dali from 
Ungava and Labrador. Whittaker collected the species at five places 
along Mackenzie river (specimens examined). References to parvus from 
the north must be viewed with suspicion, in view of the number of small 
planorbes related to this species but now known to be distinct from it. 
Some of the records by Dali, Whiteaves, Taylor, Mozley, and others, may 
include arcticus as well as other forms of these small planorbes. Mozley 
records parvus from Minaki, Winnipeg river, Alice and Lost lakes near 
Minaki, and Malachi lake near Malachi. Also from many places in Mani- 
toba. Some of these probably include arcticus. No true parvus has been 
seen personally from the area under consideration. 
The references to parvus by Whittaker (1924, p. 11) are founded on a 
variation of arcticus, specimens of these having been examined by the 
writer. A form of arcticus occurs in Georgian bay, lake Simcoe, and prob- 
ably in other places, which has been referred to altissimus F. C. Baker. 
None of these is to be classed with this Pleistocene species, but as a variety 
of arcticus, characterized by a flattening of the upper part of the body 
whorl and a somewhat “reamed out” appearance of the umbilicus. The 
specimens from these lakes are much smaller than the Pleistocene fossil 
and do not conform to the characteristics of that species (See Rawson, 
Toronto Studies, 31, p. 94). 
