518 THE CHICAGO ACADEMY OF SCIENCES. 
11. Lymne@a maxima STEARNS. Univ. Cal. Pub., Geol. V, p. 69, fig. 1. 
Type. 
12. Lymnea contracosta J. G. Cooper. Proc. Cal. Acad. Sci., ii, IV, pl. 
14, fig. 12. Type. 
13. Lymnea scudderi CockEretL. Bull. Am. Mus. N. H., XXII, p. 461, 
fig. 4, a. Type; b, narrow variety of scudderi; x 4%. 
14. Lymnea sieverti CocKERELL. L. c., fig. 3. Showing interior of shell 
and outside of a portion near the mouth; X 4. 
PLATE XVIII. 
Section of shells to show axis. 
Acella haldemani (‘DesH.’ BINNEY). 23936. 
Galba bulimoides cockerelli (Pits. & FERR.). 23940. 
Galba obrussa (SAY). 24506. 
Galba palustris (MULLER). 23987. 
Pseudosuccinea columella (Say). 23981. 
Galba randolphi (BAKER). 23675. Young. 
Lymnea stagnalis appressa SAY. 23925. 
Bulimnea megasoma (Say). 23097. 
Radix auricularia (LINNE). 23934. 
10. Galba reflexa (SAY). 23988. 
Figures Enlarged. 
PLATE ALS 
Figures 1,2. Lymnea stagnalis LinnE. Baden, Germany (23008). 
3. Lymnea stagnalis Linne. Elba River, Germany (Coll. Walker). 
4. Lymnea stagnalis appressa Say. Braddocks Bay, Lake Ontario, N. 
Y. (23035). 
5-6. Lymnea stagnalis appressa Say. Round Bay, Lake Ontario, N. Y. 
(23006). 
7. Lymnea stagnalis appressa Say. Calumet Lake, Ills. (Coll. Ferriss). 
8. Lymnea stagnalis appressa Say. Pigeon Lake, Ontario (23046). 
9. Lymnea stagnalis appressa Say. Calumet River, Ills. (8113). 
10. Lymnea stagnalis appressa Say. Romeo, Ils. (23009). 
Figures Natural Size. 
PLATE XX. 
Figures 1,2,3. Lymnea stagnalis appressa Say. Squaw Island, Niagara River, 
N:. Y¥. (Goll. Walker): 
4. Lymnea stagnalis appressa Say. Calumet Lake near Pullman, Ils. 
(19584). 
5. Lymnea stagnalis appressa Say. Bear Lake, Mich. (23014). 
6. Lymnea stagnalis appressa Say. Batavia, N. Y. (23015). 
7. Lymnea stagnalis perampla WALKER. Houghton Lake, Mich. Co- 
TYPE (23924). 
8, 9. Lymnea stagnalis perampla WALKER. Douglas Lake, Mich. (Coll. 
Ferriss). 
10-12. Lymnea stagnalis wasatchensis Hempuitr. Near Ogden, Utah. 
Types (Coll. Hemphill). 
Figure 6, enlarged 1 1/3; figure 5, enlarged 2 diameters; balance natural size. 
Figure 
CONAN pe 
