BUIXBTIN 27 126 



Drillia belloides, n. sp., Plate 1, Fig. 8 



Shell pleurotomoid, belonging to the bella group but larger 

 and more slender than the typical bella; protoconch like that of 

 bella but with the ribbed stage much shortened and later with one 

 more spiral ; post-nuclear whorls 6 ; ribs 11-13, typically about 

 11, not passing from suture to suture; subsutural band well-de- 

 fined and concave, without ribs and covered at first with low, even 

 spirals which later may become obsolete; the suture in young 

 shells may be bordered by a raised line; the earlier post -nuclear 

 whorls strongly angulated, below with 2 or 3 raised spiral bands ; 

 on the later whorls and on the body-whorl, the spirals increase 

 and alternate with smaller ones ; ribs on the body-whorl be- 

 coming obsolete below; mouth with the outer lip somewhat 

 thickened, and with a shallow anal sinus. 



Length 12, breadth #.5, body -whorl ^.5, aperture 4.. 5mm. 



This species is distinguished from D. bella by its more nu- 

 merous and less prominent ribs. These ribs do not pass from 

 suture to suture as they do in bella. The spirals are likewise 

 heavier and more irregular, size larger, with the sutural zone 

 well-defined. 



Yorktown formation ; James river, above Smithfield Va. 



Drillia ecphorse, n. sp., Plate 1, Fig. 3 



Shell of a larger size than typical bella to which it is rela- 

 ted; protoconch blunt, of about 2 whorls, at first smooth, then 

 with ribs and spirals; post -nuclear whorls about 7, with ribs 

 and broad, raised, ribbon-like spirals; body- whorl with 8 ribs 

 which pass well onto the contracted sutural band and also onto 

 the base but do not quite reach the anterior canal; the contracted 

 zone of the early whorls of the spire with 3 very low spirals; 

 below the contracted zone, the ribs are crossed by 3 raised flat- 

 topped spirals which later increase and become impressed; on 

 the body- whorl the sutural band is covered with fine and fairly 

 even spirals, generally about 7 in number; on the body- whorl 

 the spirals are at first even but alternate on the anterior canal ; 



