10 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



DESCRIPTION OF AMPIIIDBOMUS INCONSTANS, n.sp., FROM THE 

 MALAY ARCHIPELAGO. 



By Hugh Eulton. 



AmPHIDEOMUS INCONSTANS, H.Sp. 



Shell sinistral, oblong - conic, slightly ixnibilicated, polished ; 

 whorls 6J, convex, with somewhat conspicuous, oblique lines of 

 growth ; earlier whorls whitish, lower yellow ornamented with two 

 spiral bands of squarish brown spots, below which on the last 

 whorl are two narrow, dark-brown bands, the upper just below the 

 periphery, the lower about 2mm. beneath the upper; columella 

 white, erect, rounded; lip white, slightly expanded and depressed 

 at the basal portion where it joins the columella ; parietal callus quite 

 thin and transparent. Long. 38, maj. diam. 19 mm.; aperture, 

 long. 1 9 mm. 



Mai. — Alor {■= Ombai) Island, Malayan Archipelago (Everett). 



The type and following varieties are in the British Museum (Natural 

 History) : — 



Var. A. Yellow, without any markings. Alor and Pantar Island. 

 ,, B. Yellow, with a single spiral band just beneath the 



periphery. Alor. 

 ,, C. Like B, but with two spiral bands. Alor. 

 ,, D. Yellow, lower whorls with oblique, waved stripes. Alor. 



This species is near A. Kalaoensis,^ but can be distinguished from 

 it by its aperture being larger in proportion to the length of the 

 shell, and by the absence of the pink colour on the parietal callus and 

 at the umbilical area that appears in all the specimens collected of 

 j4.. Kalaoensis. It is similar in coloration to A, maculatus,^ but easily 

 separated by its rounded columella, which in the latter is flatly 

 expanded.- It differs from both in having a marked depression at 

 the base of the peristome. 



1 Ann. and Mag. Nat. Hist., ser. vi, voL xviii (1896), p. 102. 



