FAUNA OF OETHAULAX PUGNAX ZONE. 99 



TURRITELLA SYSTOLIATA, new species. 

 Plate 9, fig. 6. 



Shell large, solid, with rather rapidly increasing whorls, medi- 

 ally constricted whorls, and with the basal carina conspicuously 

 overhanging the succeeding whorl; spiral sculpture on the upper 

 part of the spire of two small beaded threads in the middle of the 

 Avhorl, with two more conspicuous flattish transversely nodulous 

 cords on each side of them, a wide, nearly smooth space on each 

 outer side, and on the basal carina a still more prominent rippled 

 cord; on the later part of the shell a more or less numerous series 

 of small interstitial threads is found, and the anterior major cord be- 

 hind the carina becomes more conspicuous than the others ; over the 

 whole surface small, wavy spiral grooves appear under a magnifier; 

 the axial sculpture consists only of incremental lines, which indicate 

 a deep, wide sulcus in the outer lip about the middle of the whorl; 

 base apparently flattened ; specimen decollate, diameter at the decol- 

 lation 7 mm., length of nine whorls 74, maximum diameter of last 

 whorl 24, of the constricted part of the same 19 mm. 



Tampa silex beds at Ballast Point, Tampa Bay, Florida. U. S. 

 Nat. Mus. No. 166103. 



This remarkably fine species appears to be rare. In its rapidly 

 increasing whorls it recalls T. megalobasis Dall, but is quite differ- 

 ently sculptured. 



TURRITELLA LITHARIA, new species. 



Plate 13, fig. 2. 



Shell small, slender, the type-specimen with 9 whorls, the apex 

 being decollate; sculpture of the early whorls composed of lines of 

 growth crossed by two spiral ridges equidistant from the suture and 

 each other ; the anterior margin of the whorls at the suture is angu- 

 late, gradually becomes prominent and finally functions as a third 

 spiral ridge; all these ridges are closely, minutely beaded with the 

 interspaces nearly smooth ; on the last whorl there is a small beaded 

 thread close behind the posterior spiral ; base flattish or even some- 

 what excavated and nearly smooth; aperture defective, the sulcus 

 of the outer lip rounded, deepest near the posterior spiral ridge. 

 Length 19, maximum diameter 45 mm. 



Tampa silex beds at Ballast Point, Tampa Bay, Florida, one speci- 

 men. U. S. Nat. Mus. No. 165118. 



This is doubtless a young shell, but it differs from the young of 

 any of the species yet known from this horizon. 



