36 Trans. Acad. Sci. of St. Louis. 



Iconica, Unio Plate LV, Fig. 283, 1867. Both Reeve and 



Dr. Lea had before them, for drawing and description, 



large and well-worn, very old, specimens. 



This form has occurred to us in the Ouachita, at Malvern, 



and the Saline river, at Benton. From the last named place 



large and fine examples that would readily pass under the 



name of Unio camelus Lea were obtained. The range of the 



species is from western New York west to Kansas and south 



to Texas. It attains a very great size in the Cumberland 



river, Tennessee, where it is exceedingly abundant. Specimens 



collected by amateurs have been received under the name of 



Unio arctior Lea. 



Unio plenus Lea. 



Trans. Am. Philos. Soc, Vol. VIII, 1840, p. 211, PI. 



XIV, Fig. 26; Reeve, Conchologia Iconica, Unio Plate 



LXI, Fig. 305, Vol. XVI. 

 The westernmost range for this form has been determined 

 thus far to be eastern Kansas in the Neosha river. In Arkan- 

 sas it has occurred to' us in collections made in the Ouachita 

 river, at Malvern, and in the St. Francis river, at Wittsburg. 

 It is a very abundant shell in the first named stream. See 

 remarks under Unio obliquus Lamarck. 



Unio plicatus Lesueur. 



Name adopted by Lea from ms name given by Lesueur. 

 Vide Trans. Am. Philos. Soc, Vol. Ill, 1829, p. 409. 



Unio rariplicala Lamarck. Historie Naturelle des 

 Animaux sans Vertebres, edition 1818, Tome VI, p. 71. 

 From the Ohio. 



Unio hippopceus Lea. Trans. Am. Philos. Soc, 2d 

 series, Vol. X, PI. I, p. 67, PI. I, Fig. 1, 1845. From 

 Lake Erie. Reeve, in Conchologia Iconica, Vol. XVI, 

 Unio Plate XI, Fig. 40, 1864. This is a depauperate 

 form of Unio plicatus. 



Unio neislerii Lea. Jour. Acad. Nat. Sci., Phila., Vol. 

 IV, 1859, p. 212, PI. XXVI, Fig. 93. From the Flint 

 river, Georgia. 



Unio brazosensis Lea. Jour. Acad. Nat. Sci. Phila., 2d 



