Fauna of the Buda Limestone. 25 



. Description. Shell turriculate, conical, sinistral; angle 49; 

 volutions angular in front, convex behind, overlapping; suture 

 deep; surface ornamented with four rows of unequal tubercles; 

 the anterior row with about thirty-two tubercles, placed on the 

 sutural angle at the outer end of ribs which converge toward 

 the umbilicus; a second row of narrow more elongate tubercles 

 is placed parallel to and behind the first row. It has the same 

 number of tubercles as the first. Below the second, is a third 

 row of elongate tubercles, of the same number as those in the 

 other rows. The fourth row consists of large, rounded tubercles 

 placed in the middle of the volution, and numbering about 

 eleven. 



This species differs from T. tuberculatus Bosc, by the spiral 

 angle and the shape of the tubercles; from T. gravesianus 

 d'Orbiny, by the more elongate form of tubercle and the angle. 

 In this species, the three rows of smaller tubercles are covered 

 by the overlapping of the adjacent whorl, whereas in 

 T. tuberculatus and T. gravesianus only one row is overlapped. 

 It appears to be rare in the Buda, only one specimen having 

 been found. 



Locality. Shoal Creek, Austin, Texas. 



