58 
Slave lake, Lake of the Woods, etc., may also include this variety. This 
small form must not be confused with Helisoma campanulata minor (Dunker) , 
a small variety associated with the large typical campanulata , which is quite 
different in form and sculpture. Many of the variations of campanulata 
appear to be dimorphic, having a large and a small manifestation of each. 
Several other varieties of campanulata have been recorded from north- 
ern Ontario or adjacent territory. Helisoma campanulata rudentis (Dali), 
a large form very characteristic, has thus far been found only in the type 
locality, Knee lake, on Hayes river, Iveewatin. The specimens listed by 
Whiteaves from Knee lake are probably the same (Dali, 1905, page 90). The 
specimens from Michigan referred to this variety by Dali and others are 
not rudentis but represent another variety (See Baker, 1927, page 49). Hcl- 
isoma campanulata wisconsinensis (Winslow) is listed by Mozley from the 
following localities : Minaka, Winnipeg river; White Dog, Winnipeg river; 
Star lake, near Reddit; Alice and Onion lakes, near Minaki; English river, 
near junction with Winnipeg river, Ontario; Indian Bay station, Falcon 
bay, Manitoba. It is also recorded from Saskatchewan (Mozley). Helisoma 
campanulata davisi (Winslow) is listed by Mozley from Douglas lake, near 
Onah, Manitoba, thus placing it in the Hudson Bay drainage, but it lias not 
yet been reported from northern Ontario (See Winslow, 1926, page 8). As in 
other groups, campanulata exhibits greater variation in its northern range 
within the Wisconsin drift sheet area than in the areas south of this region. 
Planorbula armigera (Say) 
There appear to be two varieties of this common species represented in 
the Keewatin material. One, from lakes Bamaji, Cat, and St. Joseph, has 
rounded basal whorls, the umbilicus rather shallow'. This form is more 
generally found in sloughs and swamps. The other, from lakes Botsford, 
Hamilton, and Fitchie, has rather sharply carinated basal whorls and the 
umbilicus is regularly, widely funnel-shaped. Whether this is an ecological 
variety cannot be definitely determined at present for lack of enough 
material specifically noted as to habitat. A large part of the Keewatin 
Planorbula is beach material and the original habitats cannot be deter- 
mined. Say especially mentions the basal carina which reaches the aperture 
and this must be taken as the typical form. The type locality, also, is 
western: “Inhabits Upper Missouri” (Say). Typical material is repre- 
sented by specimens from Thief River falls, Minn., collected by L. E. , 
Daniels. The swamp or pond form is well represented by material from a 
pond at Camp Colfax, near La Porte, Ind., also collected by L. E. Daniels. 
These specimens have the basal whorls rounded, not carinated, and the 
umbilicus is not funnel-shaped, the penultimate whorl forming a raised 
coil within the umbilicus. The pond and swamp variety may be called 
variety palustris , with the Camp Colfax specimens as types and type 
locality. This form appears to be more abundant tow’ard the east. 
Whiteaves records armigera from Kawinogans river and Dali lists the 
species from Moose Factory, James bay, and Vermilion lake. Mozley 
records it from Manitoba. Planorbula crassilabris Walker is listed from 
Manitoba by Mozley. This species should be found in northern and 
central Ontario. Planorbula christyi Dali w r as described from High Bluff, 
Manitoba, and is listed by Mozley from other localities. This large species 
with rounded whorls should be found in Ontario also. 
