78 THE NAUTILUS. 



Quadrula coccinea Con. 



Quadrula pttstulosa Lea. Very common. 



Quadrula obliqua Lam. 



Quadrula verrucosa Barnes. 



Quadrula globata Lea. 



Quadrula laclirymosa Lea. 



Quadrula plicata Say. 



Quadrula cooperiana Lea. 



Quadrula heros Say. Barren county. 



Quadrula metanerva Raf. 



Quadrula cylindrica Say, 



Quadrula solida Lea. 



Playiola eleg<:tns Lea. 



Plagiola securis Lea. 



Playiola donuctformis Lea. 



Lampsilis ventricosus Bar. Barren River. 



Lamps/Us multiradiatns Lea. 



Lampsilis ligamentinus Lam. Very common. 



Lampsilis Uf/amentinus Lam. var. 



Lampsilis gracilis Barnes. 



Lampsilis anodontoides Lea. Ohio, Green and Barren Rivers. 



Lampsilis rectus Lam. 



Lampsilis cumberlandicus Lea. 



Lampsilis Inteolus Lam. L. lienosus Con. 



Lampsilis texasensis Lea. 



Lampsilis ovatus Say. L. obscurus Lea. 



Lampsilis regularis Lea. 



Lampsilis alatus Lea. Common. 



Lampsilis iris Lea. Lampsilis perdix Lea. 



Lampsilis subrostratus Say. 



Lampsilis planicostatus Lea. 



Lampsilis parvus Barnes. 



Lampsilis caliginosus Con. 



Lampsilis vanuxumensis Lea. 



Lampsilis nigerrimus Lea. 



Lampsilis fat/ins Lea. 



grandiferus Lea. Rather common. 



gibbosus Barnes. Both the purple and salmon-colored forms 

 are found in all streams. 



