PLATE XXXI. 



Paso 

 Unio ligamentinoides Lea 249 



Fig. I. View of the right side of Mr. Lea's type of the species. 

 Unio pp^anodontoides Whitfield 250 



Fig. 2. View of the type specimen. 

 Unio Roanokoides Lea 248 



Fig. 3. Outline cardinal view of a large specimen of the species. 

 Unio humehosoides Lea 248 



Fig. 4. View of the right side of Lea's type specimen. 



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