BULIMULUS. 141 



netted pattern. Sutures not impressed, being filled by the peripheral 

 keel of the young shell. Whorls <H, the first two convex, those fol- 

 lowing almost completely flat, the last whorl convex, without trace of 

 a peripheral angle or carina, usually ascending in front. Aperture 

 subvertical, ovate, built forward nearly to the level of the ventral 

 convexity, brown tinted within ; peristome broadly expanded, thick- 

 ened ivithin, brown or white, acute at fhe edge. Columella oblique, 

 making an angle with the basal margin ; its edge dilated ; parietal 

 callus moderate or slight, whitish. 



Alt. 38, diam. 21, longest, axis of aperture 2<H, width 13^ mill. 



Alt. 35, diam. 20, longest axis of apertnre 21, width 13^ mill. 



Alt. 36, diam. 10, longest axis of aperture 20, width 12^ mill. 



Peru (J. B. Steere expedition). Types in coll. A. N. S., No. 74, 

 144, and coll. University of Michigan. 



Bulimulus stcerei PILSBRY, Proc. Acad. Nat. Sci. Phila., 1900, p. 

 391 (August 9, 1900). 



The granose surface gives this species some resemblance to B. pro- 

 tens, but it differs in the characters of the aperture and the flat whorls 

 of the spire. Young and half-grown shells are evidently acutely 

 carinate at the periphery. In this respect B. steerei is like B. cor a 

 Orb., and other forms referred to the genus Neopetrceus ; but it has 

 the apical sculpture of a true Scutalus, wholly unlike that of Neope- 

 trceus. 



The deeply excavated tract behind the columellar lip leads to a 

 tubular umbilicus, which is evidently large and open in immature 

 shells, but is more or less constricted in most adults. 



B. CRETACEUS (Pfeiffer). PL 22, figs. 74-78. 



Shell umbilicate, ovate-conic, rather solid, striatulate and im- 

 pressed-punctate, opaque, cretaceous. Spire convexly conic, the 

 apex rather acute. Whorls 6, a trifle convex, the last a little longer 

 than the spire, somewhat ascending in front, the base rounded around 

 the deep, subcompressed umbilicus. Aperture slightly oblique, ob- 

 long-oval, brown inside ; peristome thin, white-bordered, the margins 

 converging, joined by a callus, the right margin broadly expanded, 

 columellar margin brown, dilated, vaulted. Length 36, diam. 18, 

 aperture inside 17^ mill, long, 10 wide (P/V.). 



Rio Yonan, Peru (Baron); " Eastern Islands " (Keppell, in Cum- 

 ing coll.). 



