NEOPETR^EUS. 169 



An extremely variable form, in color " white, fleshy or yellow, 

 one colored or variously maculated and banded with brown, the 

 apex white or roseate " or as described above. The keel of the 

 young shell may be either exserted or quite concealed in the adult ; 

 the columellar margin, typically vertical or nearly so, is sometimes 

 slanting (fig. 18). 



Hidalgo unites this to B. tessellatus, stating that there are inter- 

 mediate specimens. It should therefore become a variety of that 

 species. 



Var. PERINCRASSATUS n. v. PL 33, fig. 48 ; pi. 31, figs. 18, 19. 



General form and umbilicus as in atahualpa, than which it is 

 larger, more solid, with decidedly expanded outer and basal lips, 

 very strongly thickened within. Whorls 6?, with apex sculptured 

 as in atahualpa, two or three earlier whorls ruddy, the rest of the 

 shell white with oblique purplish maculae disposed in several obscure 

 spiral bands, and a few narrow, oblique, chestnut streaks. Aper- 

 ture more ample than in atahualpa, dull reddish purple within the 

 lip and columella, rich orange-brown inside of the lip-thickening, 

 fading to cream in the throat, the lip edge white. Another spec- 

 imen (pi. 31, f. 18, 19) is white with cream colored aperture and 

 lip. Alt. 42, diam. 27 mill. 



Peru. 

 N. PAPILLATUS (Morelet). PI. 31, figs. 28, 29. 



Shell umbilicate, globose-conoid, irregularly and delicately rib- 

 bed-sulculate, spiral impressions being visible under a lens ; shining, 

 ashy-white becoming tawny toward the apex, and marked with 

 sparse blackish dots. Spire papillate, short, the apex acutely mucro- 

 nate. Whorls 6, the earlier exserted, convex, the following plano- 

 convex, rapidly increasing, last whorl inflated, round, sometimes 

 obscurely angular, five-eighths the shells length. Umbilicus wide 

 and deep. 



Aperture ovate-rounded, tawny inside, the edge paler ; peristome 

 simple, acute, thin, expanded throughout, the margins strongly con- 

 verging above, coluraellar margin spreading. Alt. 25, diam. 14 



mill. (Morel.'). 



Pucra, Pent (Angrand). 



Bulimus papillatu* MOREL., Journ. de Conchyl., viii, 1860, p. 

 372 ; Series Conch., iii, p. 186, pi. 8, f. 2. PFR., Monog., vi, p. 40. 



A very remarkable shell, with globular last whorl contrasting 

 strangely with the acuminate form of the earlier three ; the ends of 



