NEOPETR^US. 179 



crossing each other"; spire conic, rather acute, suture slightly im- 

 pressed. Whorls 7*, rather flat, the last a little shorter than the 

 spire, rotund around the compressed umbilicus. 



Aperture vertical, sinuate-oval ; peristome simple, uuexpanded, 

 acute, the columellar margin short, much dilated, angularly reflexed. 

 Columella somewhat folded above. Alt. 38, diam. (above aperture) 

 15* mill.; aperture 18 mill, long, 9 wide. (Pfr.). 



Andes of Prov. Caxamarca, Peru (W. Lobb). 



Bulimus decussatus RVE., P. Z. S., 1849, p. 99 ; Conch. Icon., pi. 

 72, f. 519. PFR., Monogr., iii, p. 431. 



" Singularly characterized by the bands of short brown streaks, 

 ranging obliquely in the direction opposed to the lines of growth." 

 (Eve.}. 



Yar. BROWNII Pilsbry, n. v. PI. 32, figs. 40, 41 ; pi. 33, fig. 39. 



Shell slender and elongated, narrowly umbilicate, with slight 

 growth-wrinkles and no spiral stride. Whitish, with many narrow 

 tawny longitudinal stripes mingled with fewer of a deep chestnut 

 shade, the stripes bearing short oblique branches, and dots arranged 

 in several spiral series. Whorls 8 to 8, the nepionic If smooth (in 

 five specimens seen), whitish, the following whorls but very slightly 

 convex, last whorl a trifle ascending in front or not so. 



Aperture decidedly less than half the total alt., long-ovate; per- 

 istome hardly expanded, thin or somewhat thickened, the columellar 

 margin dilated; columella bearing a strong fold deep within 



Alt. 41, diam. 15; alt. of aperture 17 mill. 



Alt. 36, diam. 14; alt. of aperture 14* mill. 



Alt. 39*, diarn. 15 ; alt. of aperture 16 mill. 



Peru, (A. D. Brown coll. in A. N. S. P.). 



More slender than oY. decussatiis, without spiral striation, and with 

 the aperture much smaller, contained nearly 2 times in the length 

 of the shell. The smoothness of the apex in the specimens seen may 

 be due to wear, but from the condition of the specimens I am dis- 

 posed to think that it is a case of degeneration of the sculpture. If 

 so, it is one of a very few Bulimulid species in which this character 

 is really ambiguous as a generic criterion. 



One of the specimens before me is a faint creamy flesh tint, with 

 only faint, short markings below the suture and an inconspicuous 

 line of dots at the periphery, without other markings (pi. 33, fig. 

 39). 



