PLATE 1 



Figures 1, 2, and 3. Planorbis condoni, n. sp. Type. Diameter, 2.67 mm.; 

 altitude, .55 mm. 



Figures 4, 5, and 6. Planorbis scabiosus, n. sp. Type. Diameter, 3.4 mm.; 

 altitude, 1.1 mm. 



Figure 7. Lanx nuttallii (Haldeman) ? Length, 6.4 mm.; width, 5.7 mm. 



Figure 8. Lanx moribundus, n. sp. Type. Length, 17.5 mm.; width, 14.5 

 mm.; height, 8.7 mm. 



Figure 9. Lanx moribundus, n. sp. Paratype. Length, 15.1 mm.; width, 

 11.5 mm.; height, 8.9 mm., 



16 



