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 Mergele von Muhlfeldt. 
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 slop- 
ing 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. 
Fistulana ruperti n. sp. 
PI. 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 
