THE NAUTILUS. 103 



Quadrula spharica Lea. Quadrula pyramidata Lea. 



" nodi f era Conr. '• ehenus Lea. 



" trigona Lea. 



III. Caryville Landing, Ouachita River, Union Co., Arkansas. 

 Lampsilis hydianus Lea. Quadrula perpUcata Conr. 



" ligamentinus gibbus '' heros dombeyana Val. 



Simps. " metanevra Raf. 



" fallaciosus (Sm.) " asperrima L6a. 



Simps. " nodifera Conr. 



Ohovaria castanea Lea. " trigona Lea. 



Plagiola securis Lea. ♦' pyramidata Lea. 



Unio gibbosus Bar. " ebena Lea. 

 " subgibbosus Lea. 



IV. Seven Pine Landing, Bayou Bartholomew, Morehouse Par- 

 ish, Louisiana. Quadrula trapezoides Lea. 



V. Alabama Landing, Ouachita River near the mouth of Basche 

 La Pierre Creek, Union Parish, Louisiana, 12 miles in a straight 

 line above Ouachita, Louisiana. 



Lampsilis ventricosus satur Lea. Quadrula perpUcata Conr. 



" ligamentinus gibbus " heros dombeyana Val. 



Simps. " trapezoides Lea. 



" fallaciosus (Sm.) '' cylindrica Say. 



Simps. " obesa Simps. 



" purpuratus Lam. •' sphcerica Lea. 



Plagiola securis Lea. •' pyramidata Lea. 



Unio gibbosus Bar. *' ebena Lea. 



VI. 15 miles below Monroe, Ouachita River, Ouachita Parish, 

 Louisiana. 



Lampsilis ventricostis satur Lea. Quadrula asperrima Lea. 

 Obovaria castanea Lea. " sphcerica Lea. 



Quadrula perpUcata Conr. " nodifera Conr. 



" heros dombeyana Val. " trigona Lea. 



" trapezoides Lea. " pyramidata Lea. 



" metanevra Raf. *' ebena Lea. 



Vn. Wliite Oak Landing, Boeuf River, Franklin Parish, Louisiana. 



Lampsilis hydianus Lea. Quadrula trapezoides Lea. 



•' anodontoides Lea. '* asperrima Lea. 



Quadrula heros dombeyana Val. 



VIII. Ouachita River, Catahoula Parish, Louisiana. 



Quadrula heros dombeyana Val. Quadrula ebena Lea. 



*' asperrima Lea. 



