's RIJKS MUSEUM VAN NATUURLIJKE HISTORIE — LEIDEN. 3 



fulvous, with a sharp keel at the periphery. Whorls 5, slightly convex, 

 separated by a very shallow suture, above which the whorls are depressed ; 

 apex blunt, smooth ; sculpture of post-nuclear whorls consisting of 

 crowded growth-lines, stronger at intervals ; the base is much smoother, 

 with faint growth-lines and traces of exceedingly faint spiral lines towards 

 the centre, visible only under a strong lens, periphery of last whorl with 

 a threadlike keel, above and below which, the whorl is slightly pinched. 

 Aperture a little oblique, securiform, margins distant, united by a thin 

 callus on parietal wall; upper margin thin, basal one more thickened, 

 rounded, running imperceptibly into the short columellar margin, which 

 is reflected and expanded above, closing the umbilical pit. 



Diam. maj. 19V 2 5 alt 10; apert. alt. 7, lat. 9 mill. 



Zoutbron, June/ July 1910. 



This species is allied to the preceding one, but is larger and especi- 

 ally characterized by the much fainter sculpture, for though some striae 

 are stronger, they form no ribs; it resembles in many parts Troeho- 

 nanina adulta Bavay (Nova Guinea, Yol. V, p. 286, PL 14, fig. 13) 

 but that species is conspicuously perforate. 



Macroehlamys Benson. 

 1. Macroehlamys imperforata n. sp., PI. I, fig. 1. 



Shell small, depressed, imperforate, yellowish-brown, in a fresh state 

 probably shining, the base being glossy and smooth ; sculpture partly 

 worn, but on the upper surface with rests of moderately coarse growth- 

 lines, those of the base very fine, spire slightly convex. Whorls 5, scar- 

 cely convex, separated by a very shallow, appressed suture, which is 

 slightly descending, just behind the aperture; last whorl depressedly 

 rounded, with a slight angle at its origin, quite rounded near the aper- 

 ture ; perforation quite closed by the columella. Aperture slightly oblique, 

 depressedly lunate, peristome straight, with a flat internal ridge, colum- 

 ellar margin thickened, oblique, dilated above and closing the perforation. 



Diam. maj. 10, alt. 5; apert. alt. 4, lat. 4'/ 4 mill. 



Near the Tjahé-river, June 13, 1910. 



Though I know no Macroehlamys with closed perforation, I cannot 

 locate this species in any other genus, it calls in mind some species of 

 Everettia, a genus not known from N. Guinea. 



2. Macroehlamys sp. ? 



Along the Mosso-river, June 2, 1910. 



A doubtful shell ; if really a Macroehlamys it will be a new species, 



