164 NEOPETRJEUS. 



them bearing closer, lower and finer spirals threads. This is quite 

 unlike the even grating of Drymceus (pi. 25, figs. 59, 60, 62), but 

 similar to many species of the third division of Bulimulus, compris- 

 ing Protoglyptus, A/cesiotus and Ortkotomium. The finer nepionic 

 sculpture, usually mamillar apex, strongly or acutely keeled young, 

 and generally variegated coloring or dark aperture, are characters 

 conchologically separating Neopetrceus from Protoglyptus, Orthotom- 

 ium and their allies, though the dentition, when accessible, is of 

 course a far more important difference. 



The peculiar color pattern of short oblique stripes in spiral bands, 

 seen in many species of this genus, does not occur in Bulimulus or 

 Drymceus. 



N. BINNEYANUS (Pfeiffer). PL 32, figs. 42, 43. 



Shell openly umbilicate, biconic, acutely carinated peripherally ; 

 solid, lusterless, buffer soiled white, the whole surface finely, obliquely 

 striated. Whorls 5J, the earlier If whorls bluntly biangular, form- 

 ing a mamillar apex with deep terminal dimple, sculptured with 

 slender separated vertical riblets with densely and minutely striated 

 intervals (pi. 33, fig. 49) ; succeeding whorls with sigmoid and 

 then flattened lateral outlines, produced in an exserted, acute keel 

 which projects above each suture : the last whorl acutely keeled, not 

 descending anteriorly, the base conic, slightly convex, quite bluntly 

 angular around the funnel shaped umbilicus. 



Aperture oblique, ovate, brownish-yellow inside ; peristome more 

 or less deeply purple tinted, somewhat thickened within ; outer lip 

 angulated in the middle, unexpanded above, slightly expanded below 

 the angle ; columellar margin rather broadly dilated ; columella 

 simply concave, purple. 



Alt. 24, diam. 18, alt. of aperture 14*5 mill. 



Alt. 26, diam. 19, alt. of aperture 16 mill. 



Andes of prov. Patas, Peru (Farris). 



Bulimus binneyanus PFR., Malak. BL, iv, 1857, p. 229 ; P. Z. S., 

 1858, p. 257, pi. 42, f. 4 ; Monogr., iv, p. UO. Bulimulus (Bostryx) 

 binneyanus PFR.-CLESS., Nomencl. Hel. Viv., p. 254. Not B. 

 binneyanus Pfr. in Binney, see p. 133. 



Similar to B. reentsi Phil (vol. x, p. 155) in contour, but with 

 exserted keel, different sculpture, and the apical characters of Neo- 

 petrceus. It very closely resembles the young stage of N.filiola and 

 vadum. 



