18 University of Texas Bulletin. 



Astarta (Stearmia) robinsi Hill, 1889. Texas Geoi. Surv., Hull. 

 No. 4, p. 11. 



Dimensions. Length, 22mm. ; breadth, 16mm. 



Original description. Shell much compressed, trihedral in mar- 

 ginal outline; lunule long and narrow, nearly straight from end to 

 end, concave transversely; escutcheon similar in shape and character 

 to the lunule, but longer; beaks small, appressed, angular; ligament 

 slightly exposed, and it appears to have been divided into an outer 

 and inner portion by a calcareous septum; umbonal furrows distinct, 

 producing an emargination at the posterior part of the convex basal 

 border and considerable prominence of the posterior extremity; hinge 

 strong; the lateral teeth slender and extending the full length of the 

 lunule and escutcheon respectively; surface marked by strong con- 

 centric furrows and ridges, which end abruptly at the margin of the 

 lunule and escutcheon respectively; the surface of both lunule and 

 escutcheon plain. 



The material studied seems to be a little different from that 

 figured by White, but a comparison with specimens from the 

 Del Rio and a probable Georgetown rock, leads me to believe 

 that the differences are not sufficient to be specific. 



Locality. Shoal Creek, Austin, Texas. 



VENERIDAE. 



Genus MERETRIX Lamarck. 



MERETRIX LEONENSIS ? (Conrad). 



PL VII, fig. 4. 



Cytherea leonensis Conrad, 1857, Rep. U. S. and Mex. Bound. 



Surv., Vol. I, Pt. 2, p. 153, PI. 6, fig. 1. 



Cytherea leonensis Hill, 1889, Texas Geol. .Surv., Bull. No. 4, 

 p. 14. 



Dimensions. Length, 35mm. ; breadth, 44mm. 



Description. Shell medium, subovate, inequilateral, moder- 

 ately ventricose ; beaks, about one-fourth the length of the 

 shell from the anterior end, small, excavated anteriorly, approx- 

 imate. Anterior margin slightly curved, rounded below; ven- 

 tral margin broadly rounded; posterior margin convex, rounded 

 below. Surface ornamented with concentric lines of growth. 



The material found in the Buda resembles C. leonensis. as 

 figured in the Mexican Boundary Report. However, the anterior 

 margin seems to be more gently curved in my specimens, while 



