EXPLANATION OF PLATE V. 
Figure 1. ANODONTA IMBECILIS Say. The upper figure 
is a female, the others are males 
Figure 2. ANODONTOIDES FERUSSACIANUS Lea. 
‘© 3. STROPHITUS PAVONIUS Lea. 
‘© 4. UNIO HILDRETHIANUS Lea. 
4 natural diameter. 
o 
