7li University of Texas Bulletin 



and lobes are narrow, much dissected and constricted basally. I have not 

 had opportunity to compare this species with other Vraconian and Albiar, 

 species. 



TURRILITES BOSQUENSIS n. sp. 

 PL 3, figs. 3, 7 



MEASUREMENTS : 



Height of spire 21 mm. 



Diameter of last volution . 12 mm. 



Aperture, height 7.2 mm. 



Aperture, breadth 6.1 mm. 



HORIZON: Middle of Del Rio clay at top of abundant horizon of 

 Exogyra arietina Roemer, in association with Flickia 1 bosquensis Adkins, 

 Acanthoceras worthense Adkins, Pecten subalpinus (Bose), Gryphea 

 mucronata Gabb, and small pyrite fossils. The turrilite apparently is 

 abundant. 



LOCALITY : West bank of the South Bosque River, 150 yards south 

 of the bridge on the Speegleville road, tall Del Rio cliff, 5.5 miles west of 

 the courthouse at Waco, Texas (type locality) . 



DESCRIPTION: Shell conical, sharp spired, spiral angle 37 degrees 

 near tip but spreading slightly on the last volution, sinistral, turreted, 

 five volutions in the type, decreasing rapidly in size towards the apex. 

 In side view the volutions are more angulated and the tubercles relatively 

 more prominent than in any other known Texas turrilite. There are 

 four spiral rows of tubercles, of which three are large and nearly equal 

 and lie on the prominent flank of the volution and the fourth is diminu- 

 tive and lies beneath the upper margin of the volution. The third row 

 of tubercles lies at the exact margin between the volutions and is there- 

 fore covered as is the fourth small row, by the succeeding volution, so that 

 on the earlier volutions only two rows of tubercles are exposed. Of these 

 the lower row, nearest the siphuncle, is separated from the lower ex- 

 posed margin of the volution by a broad smooth evenly curved spiral 

 strip. 



Tubercles of the first and second rows 1 are obliquely placed and are 

 not connected by visible ridges. The third row is closely spaced, the 

 tubercles being more numerous than in the first two rows, and this row 



1 Counting from below when the turrilite is placed point down (See Pervinquiere, 

 Et. pal. tun., Ceph., p. 428). The siphuncle is then inferior and may be concealed 

 by overlap of the next volution. 



