ii8 Bulletin 31 118 



Meyer'' s original description. — Thin ; convex ; oval ; anterior margin 

 truncated ; beak turned anteriorly ; lunule rather small ; impressed ; cor- 

 date ; hinge of the right valve with one cardinal and two obsolete distant 

 lateral teeth ; inner surface with radiating impressed lines, which crenulate 

 the margin ; outer surface with concentric elevated distinct lines ; except on 

 the umbo the}' are separated by rather large and regular distances. Local- 

 ity. — Claiborne, Ala. 



The radiating lines of the inside correspond, at some places near the 

 margin, with indistinct rib-like elevations of the surface. By a mistake, 

 the figure of this species, on plate i, shows two teeth below the beak in- 

 stead of one. 



We have copied Meyer's figures, but have found nothing in 

 our collections closel}' corresponding. Dall refers this to the 

 pomilia stock ; Cossmann questions whether or not it is a L^icina 

 at all. We would refer it to some variet}^ oi papyracea. 



Lucina ozarkana Harris, PI. 38. Figs. 24-26. 



? L. dartoni Clark, Bull. 141, U. S. Geol. Surv., p. 79, pi. 20, figs. 



2, a-c. 

 L. ozarkana Har. These Bulletins, vol. 2, p. 204, pi. 20, figs. 7, a-b. 

 L. cotivexa Dall, parti >n, Trans. Wag., Ill, 1903, p. 1352. 

 For original description, see Bulletin referred to above. 



In this species as found in the Sabine Eocene of Woods 

 Bluff and Ozark, there is little to indicate its possibilities in the 

 St. Maurice stage. In form of outline in interior characteristic 

 and often in size it resembles tdrichi very closely. But its denti- 

 tion is slightly weaker, it is more inflated, has more regular and 

 evenly spaced large, raised concentric lines, and above all shows 

 very striking radiate sculpturing between these lines, spreading 

 out laterally in almost Campto7iectes fashion. In the St. Maurice 

 beds it perhaps is best displayed at the base of the bluff at Clai- 

 borne. It here often shows a variation in diameter from 15 to 

 50 mm., a considerable variation as to gibbosity, with concen- 

 tric striation regularly and strongly defined. 



It is possible that dartoni of the Virginia basin maj^ be a 

 small form of this species as Dall maintains, but from the fact 

 that the Virginia specimens are all small, though presumably of 



