PLATE XXXI. 



Vfdvatd led, n. sp. 



Figs. 1, 2, 3. — Three views of shell. 



Uiiio bailri/i, n. sp. 



Figs. 4, 6, 8, 11. — Views of four individuals. 



Unio kuighti, n. sp. 



Figs. 7, 9. — Two views of specimen. 



Uiiio wilUstoni, n. sp. 



Fig. 10. — View of type specimen. 



Planorhis rcfcrnits Meek. 



Fig. 5. — Upper view of shell. 



