MELANIA SCnWANERI. 137 



3. Melania Schwaneri, n. sp. 



(Plate 2, fig. 3). 



Shell ovate , thick , dark yellowish-brown , somewhat 

 greenish at the upper whorls. Adult specimens eroded , with 

 3 whorls; sculpture consisting of rough lines of growth, 

 forming irregular plications, and a few more or less con- 

 spicuous spiral striae, giving to the shell a wrinkled 

 appearance; base of shell with a few ridges; whorls 

 flattened-convex, with an obtuse angle at the periphery, 

 only distinctly visible on the last whorl; suture well 

 marked, marginated. Aperture ovate, acute and nearly 

 channelled above, produced at the base; columella curved 

 and slightly twisted ; interior of aperture bluish white , 

 brownish at some distance from the margin, especially in 

 young specimens. Operculum with about 3 volutions and 

 a subcentral nucleus, inclining to the left margin. 



Alt. 40, lat. 21. Apert. alt. 20, lat. 11 mill. 



Hab. Borneo, legit Schwaner. 



This species seems to be allied to M. torquata , but the 

 whorls are less convex, the last whorl is much more 

 elongated, the lines of growth are nearly straight, the 

 new species is more sculptured. — I have named it after 

 its discoverer. 



4. Melania borneensis^ n. sp. 



(Plate 2, fig. 4). 



Shell turreted, rather thick, yellowish-olive, decollated, 

 remaining whorls 5, convex , slightly contracted near the 

 sutures. Upper whorls covered with numerous narrow ridges, 

 having the appearance of spiral striae; on the last whorl 

 these ridges are only conspicuous near the suture and 

 especially near the base, where they are much stronger, 

 lines of growth conspicuous but not prominent. Aperture 

 ovate , not very acute above , produced and nearly chan- 

 nelled below, columellar margin thin , moderately curved 

 much twisted; interior of aperture bluish white. 



Notes from the Leyden Museviin, Vol. XV III. 



