132 
Figure i. 
Figure 2. 
Figure 3. 
Figure 4. 
Figure 5. 
Figure 6. 
Figure 7. 
Figure 8. 
Figure 9, 
Plate XIII 
(Specimens are of natural size, unless otherwise stated) 
Unio hamili McLearn n, sp. (Page 73.) 
Dorsal view of paratype. Nat. Mus. Canada, Cat. No. 9029a. 
Left valve, same specimen. 
Dorsal view of holotype. Nat. Mus. Canada, Cat. No. 9029. 
Left valve, same specimen. 
Unio cf. hamili McLearn (Page 74.) 
Right valve, X 2. Nat. Mus. Canada, Cat. No. 9030a. 
Left valve, X 2. Nat. Mus. Canada, Cat. No. 9030. 
Unio natosini MeLearn n. sp. (Page 73.) 
Anterior part right valve, paratype. Nat. Mus. Canada, Cat. No. 9028a, 
Posterior part left valve, holotype. Nat. Mus. Canada, Cat. No. 9028. 
Right valve, paratype. U.8. Nat. Mus, 
