Mollusca from Peru and Argentina. 527 



sculptured with spiral punctate lines, the remaining whorls 

 Avith very fine and ohlique, confused, scratch-like strioe ; 

 suture very liglitly impressed, very narrowly margined 

 below, the margin being of a whitish colour ; columella 

 margin very obliquely descending, curved below, spreading 

 outwards into a caHous thickening and diffused upwards into 

 an ill-defined, granular, parietal callus; labrum narrowly 

 outwardly expanded and refiexed, pale flesh-coloured, notched 

 at its junction with the columella; aperture obliquely and 

 very broadly semilunate; operculum concave, transparent, 

 calcareous, pale flesh-coloured, laminiterous, granular, with 

 subcentral nucleus. 



Alt. 625, diam. maj. 7"5, diam. min. 6 mm. 



Aperture : alt. 3*75.. diam. 3*25 mm. 



Huh. Kio Pucaya, Eastern Peru, at an altitude of 250 ht\. 



Helicina seruia, sp. n. 



Shell conically turbinate, bright yellow, ])ainted with a 

 narrow cream-coloured peri]d)cral baud, and shading to the 

 same colour in places on the base : whorls 5, regularly in- 

 creasing, the last angled at the ])eripliery, the embryonic 

 wdiorls minutely pitted, the remainder marked with transverse 

 growth-lines, crossed in all directions by oblique scratch-like 

 stripe ; suture impressed, very narrowly margined with white 

 below ; base of shell moderately convex, showing the scratch- 

 like strire of the sjiire, densely radiately striate ; columella 

 margin descending in a short and very gentle curve, out- 

 wardly callously thickened, and diffused upwards into an ill- 

 defined, coarsely granular, ])arietal callus; labrum narrowly 

 outwardly expanded and reflexed, of a granular texture, 

 bearing a slight notch at the base of the columella, in colour 

 a bright intense yellow ; aperture rather oblique, broadly and 

 depressedly sublunate ; operculum horny, reddish-chestnut 

 coloured, granular, a little convex, laminiterous, with lateral 

 nucleus. 



Alt. 9, diam. maj. 10, diam. min. 8"25 mm. 



Aperture: alt. 4'2o, diam. 4"75 nmi. 



llab. Contamano, Rio Ucayali, Eastern Peru. 



AmpuIIarta contamanoensis, sp. n. 



Shell roughly ovate, broadly umbilicate, ashen grey, 

 shading to yellowish brown below, and painted with sj)iiul 



