NEOPETILEUS. 177 



N. LOBBII (Reeve). PI. 29, figs. 24, 25, 26. 



Shell deeply rinmte, oblong-elevated, the length more than double 

 the greatest diameter ; solid and strong ; white, rather closely but 

 irregularly striped obliquely with ochraceous mingled with a smaller 

 number of deep chestnut stripes; the obtuse apex white or orange. 

 Glossy, almost, smooth, with rather faint oblique strise on the upper 

 whorls. Whorls about 7*, the nepionic 2J with fine vertical riblets 

 and finer closer spiral striation (when unworn), the following whorls 

 slightly convex, last whorl oblong, a little ascending in front. 



Aperture ovate, less than half the shell's length, fleshy, yellowish 

 or white within ; the broadly expanded and reflexed peristome with 

 a broad border of deep brown or lead-brown, pale at the edge ; col- 

 umellar margin subvertical, broadly dilated ; columella white or 

 dark, with a strong, long fold above. 



Alt. 41-8, diam. 17'6 ; alt. of aperture 19 mill. 



Alt. 42, diam. 18 ; alt. of aperture 20 mill. 



Alt. 44, diam. 19 ; alt. of aperture 21 mill. 



Balsas, valley of the Maranon K, Peru ( W. Lobb, H. W. Webb, 

 Stiibel) ; Cajamarquilla (Paz). 



Bulimus lobbii REEVE, P. Z. S., 1849, p. 98 ; Conch. Icon., p. 71, 

 f. 516. PFR., Monogr., iii, p. 340; viii, p. 63. HIDALGO, Journ. 

 de Conch., 1870, p. 48. Otostomus (Mesembrinus f) lobbi MARTENS, 

 Conchol. Mittheil., p. 161. Drymceus lobbi W. G. BINNEY, Ann. 

 N. Y. Lye. N. H., xi, p. 35, pi. 1, f. i, ii, vi, (genitalia) ; Ann. N. Y. 

 Acad.Sci.,iii, p. 121, pi. 15, f. P (jaw); pi. 14, f. E (dentition). 



Herr Stiibel found it at Balzas clinging to Pata trees and cacti. 

 The young up to about 20 mill, length are angular (fig. 26), the 

 keel being quite sharp in those 10 mill. long. 



The coloration of well defined stripes resembles that of N. arbori- 

 ferus var. rectistrigatus, but in lobbi there are more stripes and none 

 of them show branches. The columellar fold is quite strong, and in 

 some individuals develops a callous process within, somewhat as 

 figured for N. arboriferus, pi. 32, fig. 33. As seen from the aperture, 

 in front, it varies a good deal in prominence, from the condition seen 

 in fig. 24 to more conspicuous than in fig. 27, which represents 

 Pfeiffer's ptychostylus. 



The species must be closely allied to ptychostylus and myristicus, 

 neither of which is known to me by specimens. 



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