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, PI. X, shows an adult form; figure 2, a younger 

 form. 



Locality. Shoal Creek, Austin, Texas. 



CERITHIUM SHUMARDI n. sp. 

 PL 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 cost.-i'. These costse 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 or- 

 namentation extends over about one-half the body whorl, the 

 lower portion lacking the transverse costa? 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. 

 PI. 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. 



