Fauna of the Buda Limestone 
13 
mens, are ornamented with two or three rows of tubercles; ribs 
more elevated on the convex side of the shell; ventral margin 
strongly dentate. 
The specimens collect'd from the Buda have not attained 
such vigorous development as those from the Georgetown. 
Locality. — Shoal Creek, Austin, Texas. 
PECTINIDAE 
Genus PECTEN Mueller. 
Pecten wrightii (Shumard). 
PL I, fig. 4. 
Janira wrightii Shumard, 1860, Trans. Acad. Sci., St. Louis, 
Vol. I, 1856-1860, p. 607. 
V ola ( Janira ) wrightii Hill, 1889, Geol. Surv. Texas, Bull. No. 
4, p. 8. 
V ola wrightii Cragin, 1892, Fourth Ann. Rept. Geol. Surv. 
Texas, p. 217, PI. 32, figs. 2, 3. 
Dimensions.— Length, 22mm.; height, 28mm. 
Original description — Shell ovate, subtrigonal, longest diameter from 
beak to base; superior valve flat or slightly concave, marked with three strong, 
rounded, plications, which are prolonged at the base into prominent angles; 
inferior valve strongly convex; anterior and posterior slopes abrupt, margins 
straight and diverging from the beak at an angle of about 40° ; surface orna- 
mented with four very prominent, simple radiating ribs or folds on the body of 
thej shell, and one much less developed within the margin on either side. Both 
valves are also elegantly marked with crowded, strongly waved concentric, fili- 
form striae ; beaks elongated, slender, incurved ; wings unknown. 
Locality . — Shoal Creek, Austin, Texas. 
SPONDYLIDAE 
Genus SPONDYLUS Linnaeus. 
Spondylus, cragini n. sp. 
PI. II, figs. 7, 8. 
Dimensions . — Greatest length, 35mm.; greatest breadth, 27mm. 
Description. — Shell variable, inequilateral, inequivalve, ob- 
lique. Inferior valve the larger, ventricose, produced, orna- 
