﻿46 I.AMI'SII.IS 



Lami'sii.is ix>i,AHii.KR)KMis (Lea). 



Shell lar.cre, inflated, siibsolid, with extremely full, hifrb 

 beaks and a rather decided, sharply anjT:led posterior ridge ; 

 elliptical to irregularly obovate, the posterior point rather blunt 

 and situated nearly or c|uite half way uj) from the base of the 

 shell ; ligament rather large and long, running through for- 

 ward under the beaks and showing in a narrow lunule in front ; 

 surface rather smooth, especially in the center of the shell, the 

 growth lines strong and concentrically ridged on the anterior 

 portion, the posterior slope often having a few faint radial 

 ridges and wrinkles: color tawny-brownish, shining; left valve 

 with two compressed pseudocardinals, one in front of the 

 other, the anterior higher and placed just in front of the beak, 

 sometimes these are split up into three imperfect teeth or they 

 may all be united into one long, narrow ridge : there are two 

 rather reinote, curved laterals ; the hinge line is very narrow 

 and rounded in the center ; right valve with two opposite pseu- 

 docardinals, the lower the higher, and one high, lamellar lat- 

 eral sharply truncate behind ; beak cavities deep and wide ; 

 muscle scars shallow, smooth; pallial line distinct ; nacre white, 

 pinkish or purplish. 



Length 115, height 80, diam. 55 mm. 



Savannah, Ogeechee, and Altamaha Rivers, Georgia. 



Type locality, Altamaha River, Liberty Co., Ga. 

 Unto dolabrcrformis Lea, Tr. Am. Phil. Soc, \1, 1838, p. 103, 



pi. XXIV, fig. 113; Obs., IL 1838. p. 103, pi. XXIV, fig. 113.— 



Hani.f.y, Biv. Shells, 1843. p. 189, pi. xxi, fig. 47.— Chenu, 



111. Conch., 1858, pi. xxiii, figs. 6, 6a, 6b. — Kuster. Conch., 



Cab., t86i, p. 170. pi. lit. figs. i. 2. 

 Margarita fUnio) dolahrccformis Lea. Syn., 1838. p. 18. 

 Margaron '^Unio) dolabrcrformis Le\. Syn., 1852. p. 27; 1870, 



p. 41. 

 Lampsilis dolabrcrformis Simpson. Syn.. 1900, p. 529. 



A fine species resembling L. capax in some respects, but 

 not so strongly inflated and having a sharper posterior ridge. 

 It bears something the same relation to that species that ovata- 

 does to 2>cntricosa. The marsupial swelling is rather feeble. 



