Fauna of the Buda Limestone 
21 
Description. — Spire elevated, angle 16°; whorls twenty-seven 
or more; aperture rounded; canal short, twisted. Decorations 
consist of two spiral rows of tubercles to the whorl, situated at 
its edges; posterior tubercles much larger than anterior of same 
whorl. As the shell grows larger, the tubercles become more 
separated. 
Figure 1, PL X, shows an adult form; figure 2, a younger 
form. 
Locality. — Shoal Creek, Austin, Texas. 
Cerithium shumardi n. sp. 
PI. X, fig. 3. 
Dimensions. — Height, 55mm.; breadth, 30mm. 
Description. — Shell turreted; whorls six or more, moderately 
convex; spire straight, angle about 31°; sutures well defined; 
aperture subquadrate; acute anteriorly-posteriorly ; columella 
simple; lip unknown; surface ornamented with fourteen trans- 
verse costas. These costae and the intervening spaces are traversed 
by five to seven heavy, prominent, rounded, revolving lines, 
separated by spaces about equally as wide, and ornamented 
with five to seven fine, variable, prominent, rounded lines. This 
ornamentation extends over about one-half the body whorl, the 
lower portion lacking the transverse costae but ornamented with 
the same revolving lines, the heavy ones being somewhat tuber- 
culate. This species is very similar to C. aguilerae Bose, but 
the lines are all single, whereas in that species some are paired. 
It has the single lines similar to C. debile Zekeli, but the trans- 
verse costae are more numerous. These three species appear to 
be closely related. 
Locality. — Shoal Creek, Barton Creek, Austin, Texas. 
Cerithium hilli n. sp. 
PL X, fig. 4. 
Description. — Shell turreted; spiral angle about 19°; number 
of whorls unknown; surface ornamented with twenty-four trans- 
verse ribs set end to end, giving the shell a fluted appearance, 
broken only by the suture lines. On the poorly preserved speci- 
men at hand, there is no evidence of revolving lines. 
