14 University of Texas Bulletin 



which is the more prominent. These are separated by nod- 

 ular threads. Lines of growth cover the whorls. 



Number of specimens. 2. 



Occurrence. Buda limestone, Shoal Creek, Austin, Texas. 



TurriteUa moorei, n. sp. 

 Plate III, figures 7, 8 



Dimensions. Apical angle 8%, sutural angle 10, 



Description. Shell small, tapering, six or more whorls, 

 whorls high in comparison with the width, suture well 

 marked, aperture unknown. The anterior side of the whorl 

 appears somewhat bulging, due to a pair of elevated nodu- 

 lar ribs. Sometimes the anterior of these is less prominent 

 and almost smooth. Between the two are rather heavv 

 lines of growth. Between the suture and the anterior rib 

 is a sharply inclined striated band which causes the whorl 

 to be beveled on the anterior suture. Behind the bulging 

 portion of the whorl are three well defined fine nodular ribs, 

 and on some whorls an additional nodular thread of almost 

 the same size as the ribs. The ribs are far apart and 

 spaces are covered with fine nodular threads and prominent 

 lines of growth. 



TurriteUa moorei is distinguished from TurriteUa ship-pi 

 by the shape of the whorls and by the ornamentation. 

 TurriteUa shippi lacks the sharply inclined band that char- 

 acterizes T. moorei and has a deep channel marking the 

 sutural division. In T. shippi there are two elevated ribs 

 on the posterior side with a pair of smaller ribs occupying 

 the depressed central portion of the whorl. The arrange- 

 ment of the ribs on T. moorei is quite different. 



Number of specimens. 2. 



Occurrence. Buda limestone, Austin, Texas. 



