﻿72 



l.AMrSII.IS 



dined to l)clievc that it should go in the luteola group, near 

 L. claibornensis. The ei)idermis is tawny and of a somewhat 

 waxy appearance; the sliell is sliort. solid, and. in old speci- 

 mens, much inflated. 



l^AMi'Sius roRi'iiYRiCA (Lca). 



Shell elliptical, much inflated, solid, slightly gaping at the 

 anterior base ; beaks in the specimens seen apparently low, but 

 badly eroded ; growth lines irregular ; surface rather smooth, 

 but dull colored, tawny, becoming brownish near the beaks; 

 left valve with two rather small, solid pseudocardinals and 

 two short, heavy, remote laterals ; right valve with three pseu- 

 docardinals, the middle one the largest, the hinder one small, 

 and one strong lateral ; beak cavities shallow ; muscle scars 

 well impressed ; nacre deep purple or dirty white, blotched in 

 the cavity of the shell. 



Length 56. height 46, diam. 26 mm. 



Length 46, height 27, diam. 23 mm. 



Cahawba and Coosa Rivers, yMabama. 



Type locality. Coosa River, Ala. 

 Unio porphyreus Lea, Pr. Ac. N. v'^ci. Phila., V, t86i. p. 60; 



Tl. Ac. N. Sci. Phila., V, 1862, p. 80. pi. x, fig. 228; Obs., 



VIIL 1862, p. 84, pi. X, fig. 228. 

 Mar^aron (Unio) porphyreiis Liv\. Syn.. 1870, p. 41. 

 I.ampsUis porphyreus Simpson. Syn., 1900, p. 538. 



Two shells are in the Lea collection, the larger of which is 

 distorted at the anterior base and has a dirty white, blotched 

 nacre. One additional shell with purple nacre has been exam- 

 ined, which belongs to the Aldrich collection. The species is 

 smaller than L. claibornensis, is more solid, more evenly ellip- 

 tical and is slightly biangulate behind in the three specimens 

 examined, which are probably males. 



Lampsilis stramtnea (Conrad). 



Shell long elliptical or long obovate, not greatly inflated, 

 subsolid, with a slight posterior ridge; beaks not full or 

 high, their sculpture not seen; surface usually sculptured 



