M. M. SCHEPMAN, LAND- AND FRESHWATER MOLLUSCA ETC. 157 



This nev; variety cornes in shape and colour rather near to var. tiara Beck, but the 

 hell is much more glossy than spécimens from Ceram and it is much thinner. Man y of the 

 spécimens are broken, this is the case with the largest spécimen, from which I took the 

 measurements, moreover the shells hâve probably suffered from the alcohol, for especially 

 after drying, large patches of a dull white colour, make their appearance. The number of 

 spécimens is about 20. 



2. Xesta cïdaris Lamarck. 



Lamarck. An. s. vert. Ed. II, Vol. VIII, p. 45. 

 Reeve. Conch. le. Hélix, fig. 477 (tumens). 

 Tryon. Man. of Conch. Ser. II, Vol. II, p. 72, PL 19, fig. 79. 

 Timor. Koinini River, near Kupang, Aug. 21, 1909. 

 One spécimen, not quite adult but very characteristic. 



Hemiplecta Albers. 



1. Hemiplecta crenocarinata n. sp. PI. IV, fig. 2. 



Shell depressed, carinate, rather conical above, slightly convex below, narrowly per- 

 forate, the perforation partly covered, light brown, the top-whorls a little reddish, base slightly 

 lighter near the centre; upper surface rather dull, basai one shining. Whorls about 5 '/.-,, each 

 slightly convex above. Sculpture consisting of arched growth-lines and on the upper surface 

 of very fine irregular hair-lines, the lovver whorls with an impressed spiral line or groove, 

 accompanying the keel at a little distance ; between this line and the periphery, the sculpture 

 is coarser, making the suture of médian and the keel of last whorl slightly crenulate; a similar 

 groove is visible on the basai surface, near the keel and the intermediate space is likewise 

 sculptured coarser. Near the aperture the keel is less acute, partly by the disappearing of the 

 spiral grooves; last whorl not descending. Aperture hatchet-shaped, uppèr margin straight, sharp, 

 slightly convex, basai one regularly curved, slightly thickened and expanded, columellar 

 margin more ascending, running without angle into the basai margin, still more thickened 

 and even slightly triangular near the perforation, which it covers in part; the thickened 

 margin is whitish. 



Diam. maj. 21, ait. Il, apert. ait. (diagonally) 8, lat. 1 1 '/ 2 mill. 

 Xew Guinea. v. Weel's Camp. May, 27, 1907. 



This species, of which only one spécimen has been collected, is nearly allied to Nanïna 

 infelix Smith (The Conchologist, Vol. II, p. 109; The Journ. of Conch. Vol. V, PI. 2, fig. 7) 

 but differs especially in the front view, the aperture in that species being more descending, 

 more horizontal in the new one, moreover Smith does not mention the hair-like striae of 

 the upper surface, nor the crenulations of the keel. The shell is smaller though probably 

 adult, as the lower part of the peristome is tickened and expanded, and the keel and accom- 

 panying spirals are less or not pronounced near the mouth. 



2. Hemiplecta sp. 



Xew Guinea. Resi Ridge, Aug. 30, 1907; Helhvig Mounts, 1000 — 1360 M. Oct. 13, 1909; 

 2500 M. Oct. 1909. 

 Under this head I hâve united 3 spécimens, which, though nearly allied,. are however 



