3G6 LAX I) AND l-RESHATATER 



rcdecterl, opeiily and expandedlj' crenate; columellar marp-in 

 curviug vertically ; operculum slightly concave in front, distantly 

 spiral. 



Size : maj. diam. 6*8 ; alt. axis 4'0 mm. 



The form and sculpture distinguishes this shell from the other 

 crenulated species obtained in the valley of the Tsanspu. 



Subgenus Rapxomphaltjs, nov. 



Shell globosely conoid, widely umbilicated. The margin of the 

 umbilicas is a well developed keel, which commences near the 

 constriction. The peristome is strongly and irregularly crenulated, 

 showing well behind the aperture viewed from the side, between 

 this and the sharp constriction a well raised ridge crosses the 

 whorl transversely. 



Ar-YCiEus (Eaptomphalijs) magnipictjs, n. sp. (Plate CLVT. 

 figs. 1, 1 «, 1 &.) No. 3115 I}.M. Coll. 



Locality. Yamne Valley, Abor Hills {Lt. Q. F. T. Oal-es, R.E.). 



Shell very openly umbilicated, bordered by a distinct keel, very 

 globosely conoid ; sculpture on the upper whorls, and as far as the 

 end of the long sutural tube there is distant strong costulation, 

 thence for the length of the tube it is extremely fine and close ; 

 fcolour white, shell old; spire moderatbly high, apex small, somo- 

 Avhat depressed; suture impressed; whorls 4^, tumid, the constric- 

 tion is sudden and close to the 1)ase of the sutural tube, it there 

 expands considerably towards the aperture, commencing with a 

 liigh ridge well raised, and this again by another broader and 

 more rounded, which merges into the very broad expanded wavy 

 peristome ; aperture ovate, subangulate both above and below ; 

 ponstome strongly crenulated, with five indentations. 



Size : maj. diam. 4'25 ; alt. axis 1'7 mm. 



This is a very beautiful species. The sharp, well defined keel 

 around the umbilicus is a character quite new to me in this genus, 

 0E.e whi(;h has led me to place it in a new subgenus. In the very 

 fine costulation on the swollen portion of the last whorl, it is 

 similar to A. ahorensis. 



Altc^us oakesi, n. sp. (Plate CLVII. figs. 4, 4 a.) No. 3578 

 E.M. Coll. 



Locality. Chanjuk La, in Tsanspu Valley, 4300 ft., Lat. 29^ 25', 

 Long. 95° 20' {Ta. G. F. T. Oakes). 5 specimens. 



Shell very globosely conoid, somewhat depressed, openly umbili- 

 cate, with a strong tendency to a ridge bounding it : sculpture, 

 costulation distant, subdued on the apical whorls, strong and coarse 

 near base of the sutural tube, but soon becoming finer ; colour, all 

 old and bleached shells ; spire moderately high, apex small ; suture 

 impressed ; whorls 4, much swollen next sutural tube, the last 



