98 
Plate VII 
Lymnaea obrussa Say 
Figures 11a, lib. View showing aperture and side opposite aperture. Marl 
beds, McKay lake. (Page 67.) 
Lymnaea stagnalis appressa Say 
Figures 12a, 12b. Showing aperture and side opposite aperture. Marl 
beds, lot 7, Junction gore, Gloucester tp., Carleton co. (Page 67.) 
Planorbis deflectus Say 
Figures 13a, 13b. Frontal and umbilical aspects respectively. X 3. Marl 
beds. Colton lake, near Renfrew. (Page 71.) 
Lymna&a obrussa decampi Streng 
Figures 14a, b, c. View of side opposite aperture. X 2. Marl beds, Colton 
lake, near Renfrew. (Page 68.) 
Figures 14d, e, f. Showing variation in aperture. X 2. Marl beds, Colton 
lake, near Renfrew. (Page 68.) 
Lymnaea galbana Say 
Figures 15a, b, c. View of side opposite aperture. X 2. Marl beds, McKay 
lake. (Page 69.) 
Figures 15d, e, f. View showing variation in apertures in different individ- 
uals. X 2. Marl beds, McKay lake. (Page 69.) 
Planorbis antrosus Conrad 
Figures 16a, c. Apical aspect showing fuainel-shaped spire. X2. Marl 
beds, McKay lake. (Page 69.) 
Figures 16b, h, i. Umbilical aspect showing variation in cari nation on base 
of whorls. X 2. Marl beds, McKay lake. (Page 69.) 
Figure 16d. View of side opposite aperture. X 2. Marl beds, McKay lake. 
Figures 16e, f, g. Showing variation in apertures. X 2. Marl beds, 
McKay lake. (Page 69.) 
Planorbis campanulatus Say 
Figures 17a, b. Apical and umbilical aspects respectively showing campan- 
ulate expansion. X 2. Marl beds. McKay lake. (Page 70.) 
Figures 17c, d, View of aperture and side opposite aperture respectively. 
X 2. Marl beds, McKay lake. (Page 70.) 
