NEOPETR^EUS. 175 



Bulimus sowerbyi PFR., P. Z. S., 1846, p. 114 ; Monogr., ii, p. 195. 

 REEVE, Conch. Icon., pi. 57, f. 383. 



Known to me by description and figure only. The peculiar char- 

 acter of the color-markings suggests a position near B. altoperuvianus, 

 etc. Perhaps it is an immature shell. The locality, if correct in the 

 present limits of Columbia, casts some doubt on this generic refer- 

 ence, but it probably applies to the former wide extension of 

 Columbia southward. 



N. ARBORIFERUS Pilsbry, n. sp. PI. 32, figs. 32, 33. 



Shell deeply rimate, oblong, solid, typically flesh tinted, more 

 pink above, or nearly white, with numerous narrow streaks of light 

 chestnut, at intervals deep chestnut, in harmony with growth-lines 

 these streaks branching tree-like along the right side, the branches 

 sometimes anastomosing to form obliquely descending streaks, or 

 cutting the light ground into lozenges ; the streaks on the basal 

 volution sometimes combined with crescents, and almost always their 

 intensity is broken by a narrow peripheral light zone ; a tract be- 

 hind the lip generally deeper chestnut or black ; somewhat shining. 

 Whorls 7-7 , the first white or blackish with white crown, nepionic 

 \h with the typical Neopetrceus sculpture (when unworn), the riblets 

 very fine and close, several whorls following rather flattened, with a 

 keel filling the suture, sharply obliquely striate ; last whorl oblong, 

 nearly smooth, sometimes showing faint spiral lines in places ; slightly 

 ascending anteriorly. 



Aperture oval, half the length of shell or somewhat less, about 

 equal to the greatest diameter of the shell ; whitish or buff with 

 bluish markings within ; outer lip expanded throughout, very dark 

 leaden-brown with a light edge ; columellar lip subvertical, broadly 

 dilated ; columella either white or lead-brown showing a rather 

 strong fold deep inside, which within the last whorl either becomes 

 obsolete or is thickened into a stout, heavy callous lamina (as in 

 fig. 33). 



Alt. 41-5, diam. 19'5 ; alt. of aperture 20*3, width 15 mill. 



Alt. 44-5, diam. 21'5 ; alt. of aperture 22, width 17 mill. 



Andes of Peru. 



This form resembles JV. altoperuvianus in color-pattern, and N. 

 patasensis in the shape and color of the aperture. It is a narrower, 

 more oblong species than either. The degree of development of the 

 internal callus upon the columella is variable, in some specimens 



