45 
Some measurements of this material indicate a larger size than that 
indicated by Marsh or Simpson (Desc. Cat., p. 62). 
Length 
Height 
Diameter 
— 
Lake Bamaii 
Mm. 
82 
Mm . 
46 
Mm. 
28 
Male 
it U 
72 
43 
26 
Male 
U it 
73 
48 
27 
Female 
Hamilton lake 
75 
44 
24 
Male 
it it 
71 
43 
23 
Male 
Cat lake 
75 
44 
25 
I'emale 
Marchington river 
85 
49 
29 
Male 
U it 
81 
48 
30 
Male 
it ti 
64 
40 
28 
Female 
Other localities are as follows: Hill, Schist, St. Joseph, Pashkokogan, 
Pelican, Stranger, and Shaubemini lakes; Marchington and Pashkokogan 
rivers. Superiorensis appears to be largely a species of lakes, as judged by 
the records. Published records of superiorensis are rare in Canadian 
literature. The type locality is Michipicoten river north of lake Superior, 
in southern Ontario. Whittaker (1924, page 8) found it in lake Kakiskaand 
at the mouth of Hay river, both localities in the Mackenzie River basin. 
The specimens from the latter locality are somewhat heavier than those in 
the Calm material. It is possible that some of the records of Lampsilis 
luteola from Keewatin and Ontario really belong under superiorensis. As 
for example Whiteaves’ records from Ekwan river, mouth of Moose river, 
Albany river, Kawinogans river, and lake Abitibi. It is reported by 
Mozley from a number of places in Manitoba and western Ontario, border- 
ing Manitoba. The known authentic records indicate a very wide dis- 
tribution for this species, especially to the north. 
The rarity of records of the river forms of the Naiades from this part 
of Ontario indicates clearly their general absence. Whittaker records 
Strophitus edentulus from the mouth of Hay river and Mozley lists it with 
the fauna of Manitoba and western Ontario. Lasmigona complanata is 
listed from Minaki, Winnipeg river. Dali (1905) records the following 
species of Naiades from parts of Ontario and Manitoba: 
Lampsilis venlricosa (Barnes ) 1 
Lampsilis luteola (Lam.) 
Lampsilis radiala (Gmelin) 
Lampsilis carinalu (Barnes) 
Ligumia ellipsiformis (Conrad) 
Ligumia recta (Hay) 
Proptera alula (Hay) 
Leplodea fragilis Baf . 
Anodonta irnplicata Hay 
A nodonta pepiniana Lea 
A nodontoides ferussacianus (] ,ca) 
Lasmigona costata Baf. 
Lasmigona complanata (Barnes) 
Amblema costata Baf, 
Megalonaias gigantea (Barnes) 
Quadrula quadrula Baf. 
Fusconaia Jlava (Baf .) 1 
Just how many of the species listed inhabit the Hudson Bay drainage 
is not certain. None of the usual river mussels was obtained by the Cahn 
party and few are recorded by other observers from this drainage and it 
is quite possible that many of those listed are not found outside ofjhe 
Mississippi drainage. 
» For the nomenclature of the TJnionidae of this region see Baker, Moll. Wis., vol. I. 
