176 NEOPETR^EUS. 



only a slightly spiral twisted pillar appearing when the shell is cut, 

 and in others a strong callous fold such as we find in certain Lower 

 Californian Bulirauli. 



Var. rectistrigatus n. v. PI. 32, figs. 36, 37. 



Similar to the type, but with straight chestnut streaks, at inter- 

 vals darker, sometimes showing a slight tendency to branch on the 

 earlier whorls, as shown in fig. 37. Aperture cream-colored within, 

 the peristome broadly bordered with a dark leaden-brownish color. 



Much stouter than N. lobbii, which has the same color pattern. 



Var. latistrigatus n. v. PL 32, figs. 34, 35. 



Similar to the preceding, but dark purple-brown streaks strongly 

 predominate on the lower volutions ; spire obliquely streaked or 

 uniform flesh-tinted or whitish ; mouth bluish or leaden within, 

 sometimes streaked. Average size somewhat less. 



Alt. 41, diam. 21 ; alt. of aperture 21 mill. 



Alt. 37, diam. 19 ; alt. of aperture 18'6 mill. 



N. PATASENSIS (Pfeiffer). PL 32, fig. 38. 



Shell deeply rimate-umbilicate, ovate-conic, rather solid, somewhat 

 sharply striate, little shining ; fleshy whitish, usually streaked and 

 clouded with light reddish. Spire a little convexly conic, the apex 

 subacute. Whorls 7, the apex rather flat, penultimate more con- 

 vex, the last whorl longer than the spire, slightly ascending in front, 

 rotund at base, subcompressed at the umbilicus. 



Aperture slightly oblique, oval, broadly bordered with violaceous 

 inside ; peristome simple, the right margin narrowly expanded, col- 

 umellar margin much dilated, spreading. Columella brown-viola- 

 ceous, subplicate deep within. Alt. 47, diam. 24 mill. ; aperture 

 26-27 mill. long. (P/r.). 



Var. Shell thinner, deep flesh colored, generally with oblique 

 tawny streaks. 



Province Pcttas, Peru (Dr. Farris). 



Bulimus patasensis PFR., P. Z. S., 1858, p. 257, pi. 42, f. 6 ; 

 Malak. BL, 1859, p. 38 ; Monogr., vi, p. 43. 



The peristome is dark within, and the last whorl is more expanded 

 basally than in N. altoperuvianus ; the aperture is lees produced 

 outwardly, and the lip is less straightened above. The form is 

 decidedly stouter than in N. arboriferus and its varieties. 



