Plate 1 1 
Figures 1-5. llclisnuui vhitravoxi F. C, Baker. Lac des 
type, Z3231 1 ; figure 2. para type. Z32312; figures 
.Mi lie Lacs, Out. Figure 1, holo- 
3-5, type locality, Z323 1 3. 
Figures 6-15. Hvlisoina htfracarinafum I''. 0. Baker. Figure 6. holotype, Z32361; figures 
(-!), paratypes. Z32362, Basswood River rapids; figures IP-11. (Georgian bay, Z25258; 
figures 12-14. Bamaji lake, showing rounded basal whorls, Z32342; figure 15. Rideau 
river, near Billings bridge, base subearinate, Z32521. 
Figures 1 (5 18. Jfelinoma pilxbryi (F. C. Baker). Tomahawk lake, Wis. Type locality, 
University Illinois, Z2913'8a. 
Figures enlarged 11 diameters. 
