158 M. M. SCHEPMAN, LÂND- AND FRESHWATER MOLLUSCA ETC. 



slightly différent; they agrée in being rather flat above, especially that from the first-named 

 locality, and considerably more convex below, with a sharp keel, a narrow umbilicus or per- 

 foration and a hatchet-shaped aperture; the sculpture consists of conspicuous striae, stronger 

 above the suture and the keel of last whorl, with waved intermediate striae, only visible 

 under a strong lens, scarcely perceptible in another spécimen, basai surface much smoother, 

 so are the uppermost whorls in the first and third spécimen, in the second they are slightly 

 plicate. As to colour, they are of a lighter or darker brown tinge above, darker towards the 

 suture and below the keel, the second spécimen is the darkest and more uni-coloured. As 

 the spécimens hâve the appearance of being juvénile, which circumstance much diminished 

 the possibility of identifying them with any of the described species at the same time it 

 prevents me from describing them as new, the more so as the only spécimen from each 

 locality, has still its own characters. 



3. Hemiplecta densegranosa n. sp. PI. IV, fig. 3. 



Shell subglobose, narrowly umbilicated, chestnut-brown, lighter below, around the um- 

 bilicus, with a narrow, slightly darker zone at the periphery, which is very bluntly carinate. 

 Whorls 5, moderately convex, separated by a shallow suture, last whorl not descending. 

 Nuclear whorls eroded in the largest spécimen, smooth and shining in the young ones; 

 sculpture of post-nuclear whorls consisting in the supra-peripheral part of shell of arched 

 striae, much closer on the upper whorls, crossed by numerous spiral striae, which give to the 

 shell a granular appearance, the granules being more elongated on upper whorls, nearly 

 quadrate on last one, fading on the last third part of last whorl ; basai part of shell, below 

 the keel, smoother, glossy with remote striae and very fine, waved spiral striae, only visible 

 under a strong lens. Aperture slightly oblique, rounded, except for being emarginated by the 

 last whorl; peristome thin, columella reflected at the upper part and partly covering the 

 narrow but pervious umbilical perforation ; margins connected by a thin layer of enamel on 

 the body-whorl. 



Diam. maj. 36, ait. 26, apert. ait. i8" 2 , lat. 18 '/a mill. 



New Guinea. Resi Ridge. Aug. 30, 1907; Hellwig Mounts, 1000 — 1360 M. Oct. 13; 2500 M.' 

 Oct. 1909. 



Though the largest spécimen seems to be not full-grown, I think it may be nearly so, 

 and thus thought it fit to be named and described. It much resembles H. foullioyi Guill., 

 which Tapp. Canefri thought to belong to Xesta (Fauna Mal. N. Guinea, Suppl. p. 37) and 

 which BURNE (Proc. Mal. Soc. Lond. IX, p. 208, sq.) classified sub Rhyssota, on account of 

 the gênerai appearance of the animal and of some anatomical particulars. As the shell-cha- 

 racters of the species under considération agrée much better with Hemiplecta and the large 

 spécimen lacks the soft parts, I hâve located it in Hemiplecta. The shell differs from that of 

 foullioyi by its much smaller size, its more globose shape, less convex whorls, which are not 

 depressed near the suture and are separated by a much shallower suture; in foullioyi the 

 whorls increase more rapid and the colour differs from the new species by a white peripheral 

 band and a broad white zone round the umbilicus. The sculpture is very similar but the 

 nuclear whorls of foullioyi are sculptured in the same way, though weaker, as the next whorls. 



