Fauna of the Buda Limestone. 19 



the posterior is more rounded. The proportions also agree 

 closely with those of Conrad's figure. In my thesis, I referred 

 to this as Meretrix budaensis n. sp., but the study of more ma- 

 terial inclines me to refer it doubtfully to Conrad's species. 



This species appears to be quite common in the upper layers 

 of the Buda, but it is not well preserved. 



Localities. Shoal Creek, Barton Creek, and Bouldin Creek, 

 Austin, Texas. 



Genus TAPES Mergerle von Muhifeldt. 



TAPES AUSTINENSIS n. sp. 



PI. VII, figs. 8, 9. 



Dimensions. Length, 25mm. ; breadth, 17mm. 



Description. Shell small, ovate-elongate, narrowly rounded 

 anteriorly and posteriorly; posterior broader than anterior; ven- 

 tral margin broadly convex ; dorsal margin convex, gently 

 sloping downward from the beaks to the posterior margin; beaks; 

 approximate, situated about three-fifths the length of the shell 

 from the posterior end. Surface marked by fine, unequal, con- 

 centric lines of growth. 



Locality. Shoal Creek, Austin, Texas. 



GASTROCHAENIDAE. 



Genus FISTULANA Bruguiere. 



FlSTULANA RUPERTI n. Sp. 



PL VII, figs. 5, 6. 



Dimensions. Length, 23mm. ; breadth, 12mm. 



Description. Shell elongate, suboval, broader anteriorly than 

 posteriorly, substance thin ; beaks nearly terminal ; anterior mar- 

 gin broadly rounded; posterior margin narrowly rounded; dorsal 

 and ventral margins convex and diverging from the posterior; 

 beyond the middle the ventral margin turns abruptly to meet 

 the anterior; ventral side gaping for a considerable part of its 

 length; surface smooth, marked by fine lines of growth. 



Tube clavate and generally vertical in the rock. 



This species is very common in some beds of the Buda, and 



