38 Trans. Acad. Sci. of St. Louis. 



Unio purpuratus Lamarck. 



Plate V. 



Animaux sans Vertebres, 2d Ed., Vol. VI, p. 533, 1838. 

 Described from the Mississippi ; Heeve, in Conchologia 

 Iconica, Vol. XVI, Unio Plate XXIV, Fig. 115, 1865. 

 Unio ater Lea. Trans. Am. Philos. Soc, Vol. Ill, 

 1829, PI. VII, Fig. 9, p. 426. This is the female and 

 was described from specimens taken in the Mississippi 

 river, below Natchez. 



Unio lugubris Say. American Conchology, 1832, Plate 

 XLIII. Described from the Bayou Teche, Louisiana. 

 This name was proposed by Sa} 7 for Lea's species, he 

 doubtless thinking that Nilsson's name had priority. 



Unio poulsonii Conrad. New Fresh Water Shells of 

 the United States, 1834, pp. 25-26, PI. I ; Keeve, in Con- 

 chologia Iconica, Vol. XVI, 1866, Unio Plate LI, Fig. 

 270. Conrad described his form from the Black Warrior 

 river, Alabama. 



Unio coloradoensisLiea. Jour. Acad. Nat. Sci. Phila., 

 2d series, Vol. Ill, 1857, p. 314, PI. XXXI, Fig. 29. 

 Described in 1856, from specimens obtained in the Colo- 

 rado river of Texas. 

 This species is among the most ponderous of North American 

 Uniones. Chiefly confined to the streams of the southern United 

 States it yet ranges as far north as middle Kansas, and east- 

 wardly to north Alabama and Georgia. In Mississippi, Louis- 

 iana, Arkansas, and Texas it is both common and large, but does 

 not rival the giant forms which have come to our cabinet from 

 the Little Arkansas river, near Wichita, Kansas. Two spec- 

 imens from that locality, and those not the largest, form the 

 basis of the figures which are given herewith. 



Lamarck's description, but not his original one, is given 

 herewith, the bibliographic reference to which appears in the 

 above synonymy. 



" U. testa ovato elliptica, tumida, anterius sabbiplicata, 

 intus viridi-violaceo purpureoque tincta; dente laterali cren- 

 ulato. * * * Habile le Mississipi * * * Je la crois 

 des grandes rivieres de V Afrique. * * * Belle et grande 



