PLATE XXV. 
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Some Skokie mollusks 
1. Lymnea reflexa Say. Adult. 
2,3. Lymnea reflexa crystalensis Baker. Immature reflexa. 
4-8. Lymnea palustris michiganensis Walker. Juvenile reflexa. 
9-13. Physa gyrina Say. Adult. 
14-17. Physa oleacea Tryon. Immature gyrina. 
18,19. Succinea ovalis optima Pilsbry. Possibly senile form of ovals. 
20. Succinea ovalts Say. 
21. Lymnea parva sterki1 Baker. 
22. Ancylus parallelus Hald. (After Fig. 6, Pl. I., Hald. Monogr.) 
23. Strobilops virgo (Pilsbry). (After Fig. 120, Walker’s Moll. Mich.) 
Figures 1—20 enlarged 14 diameters, fig. 21 enlarged 3 diameters; fig. 22 greatly enlarged; 
fig. 23 enlarged about 10 diameters. 
