l8o M. M. SCHEPMAN, LAND- AND FRESHWATER MOLLUSCA ETC. 



Suborder Scutibranchia. 



RHIPIDIGLOSSA. 



Fam. HELICINIDAE. 



Aphanoconia Wagner. 



i. Aphanoconia leucostomoides n. sp. PI. VI, fig. 2. 



Shell conical-globose rather thin, shining, yellow. Whorls 4'/ 2 , slightly convex, separated 

 by a distinct but rather shallow suture, not descending in front. Spire conoidal, apex blunt, 

 papillary. Sculpture of the apex consisting of spiral rows of very small but conspicuous pits, 

 only visible under a strong lens, followed by about '/ 3 of a whorl with 2 faint spiral lirae ; 

 subséquent whorls with very fine, oblique, radial striae, on the last whorl traces of about S 

 spirals having an epidermical appearence, they are rather irregular and much interrupted (pro- 

 , bably rubbed off) except behind the peristome ; at last in some parts of the shell, microscopic, 

 very oblique scratches are visible; last whorl rounded, slightly more depressed above. Aper- 

 ture a little oblique, subtriangular; columellar margin concave below, ending in a point, 

 peristome expanded, whitish interiorly. Callus slightly granulose, rather thin, but conspicuously 

 circumscribed in its basai half. 



Operculum yeUowish-white, agreeing in shape and structure with the description of 

 Wagner in the second édition of Martini-Chemnitz's „Conchylien Cabinet". 



Alt. nearly 6, diam. maj, incl. perist. 6. Apert. ait. 3'/ 4 , lat. 2 3 / 4 mill. 

 New Guinea. Lorentz River, Sept. 22, 1909. 



This species belongs, according to its characters, to the genus Aphanoconia. Amongst 

 the species from New-Guinea, Helicina leùcostoma Tapp. Can. (Fauna mal. N. Guinea, p. 277, 

 fig. h, PI. 9, fig. 10, 11, seems to be nearly allied, but there is no trace in the new species 

 of a white-bordered suture, the sculpture of upper apical whorls, may hâve been overlooked 

 by T. C, but above ail the sculpture of callus is différent; Tapp. Can. calls it crebre-i m p r e s s o- 

 punctatum, in the new species it is granulose. 



2. Aphanoconia rnfo-unistrigata n. sp. PI. VI, fig. 3. 



Shell conical, thin, shining, yellow, with a rufous, squarish-oblong spot at the upper 

 part of last whorl, just behind the peristome. Whorls about 4, scarcely convex, separated by 

 a distinct, shallow, white-bordered suture, slightly descending in front. Apex blunt, papillary, 

 with spiral rows of small pits, as in the former species. Subséquent whorls with slightly 

 obscure, radial striae and the oblique scratches, no spirals visible (perhaps rubbed off), last 

 whorl with rounded periphery, obliquely depressed above, much so below. Aperture slightly 

 oblique, subtriangular, upper margin straight, rufous, outer and basai margins expanded, whitish 

 interiorly, columellar margin straight, angular at the junction with basai margin. Callus rugose, 

 thin, whitish, impressedly circumscribed just near the end. 



Operculum in another eroded spécimen whitish (bleached ?), not sufficiently visible, with 

 the characteristic groove. 



Alt. nearly 4, diam. maj. 4 1 ,, apert. ait. 2, lat. i 3 / 4 mill. 

 New Guinea. Resi Ridge, Aug. 30, 1907. 



