THE HAMILTON ASSOCIATION. II 5 



85. Pisidium compressum, Prime. Rare. 



86. Unio alatus, Say. Rare, 

 gracilis, Barnes. Rare, 

 gibbosus, Barnes. Rare, 

 complanatus, Sol. Common. 

 Nasutus, Say. Common. 

 I.uteolus, Lam. Common, 

 subovatus, Lea. Rare, 

 pressus, Lea. Common but local. 



94. Margaritana marginata, Say. Rare. 



95. Anodonta ovata, Lea. Rare. 



96. " plana. Common. 



97. " Benedictii, Lea. Common. 

 ' fluviatilis, Dillwyn. Common. 



87 



90 

 91 

 92 

 93 



