Bulletin 27 128 



Drillia mcgrawensis, n. sp,, Plate 1, Fig. 13 



Shell rather small, slender, sculptured with strong, widely 

 spaced riblets and with strong or obsolete spirals; sutural zone 

 flat and not prominent; nuclear whorls 3, the 1st 2 smooth, the 

 last transversely sculptured by 3 or 4 smooth riblets; post-nuc- 

 lear whorls 5 or 6, the 1st with the transverse sculpture crossed 

 by 5 or 6 impressed lines, giving rise to spiral bands; on the 

 later whorls, the spirals tend to become obsolete, disappearing 

 entirely from the sutural band and leave the rest of the spire- 

 whorls with 3 or 4 wide spirals, these spirals become obsolete on 

 the body-whorl but a few still persist on the base and on the 

 canal ; riblets on the body- whorl about 7 , prominent and widely 

 spaced, absent from the appressed, smooth, sutural band and 

 from the base; mouth elongate, but not narrow, with the outer 

 lip thin ; columella slightly bent. 

 Length 8, breadth 3.25mm. 



This species belongs with D. limatula and lunulata. The few 

 heavy, widely-spaced riblets, the inconspicuous sutural band and 

 the presence of spirals on the base are diagnostic. 

 Duplin formation; Natural Well, N. C. 



Drillia magnoliana, n. sp., Plate 1, Fig's 10, 11 



Shell moderate in size, slender, solid, polished and with the 

 whorls only slightly convex; the suture is bordered by a flat 

 band, generally defined by a line or groove; whorls about 9; 

 the body- whorl with about 15 or 16, oblique, straight riblets; 

 these riblets commence just below the periphery and pass up- 

 ward to the base of the sutural band, here they may become 

 obsolete or continue across in a direction about 13 5 ° to their 

 former; as a rule, the riblets on the sutural band are obsolete 

 below, but strong next to the suture; base of the body- whorl 

 without riblets; mouth subovate, with the outer lip thicken- 



