I04 NEW SPECIES OF XESTA, ETC.,. FROM MADAGASCAR AND PERAK. 



AmphidFomus perakensis, n. sp. n. ix, figs. S— lo. 



Shell dextral or sinistral, solid, general form as figured, imperforate, 

 polished, yellow with a narrow conspicuous band at the suture ; 

 whorls 7^, slightly convex, with weak oblique striae or lines of growth ; 

 coluindla hearing a thin and somewJiat flat iirojedimj pZa/'e, situated 

 interiorly at about a third of a volution from tJie exterior; peristome 

 white, thick, expanded and slightly reflected, margins connected by 

 a transparent raised callus, columellar portion triangularly dilated 

 above, somewhat angular below : aperture sub-ovate, whitish within. 



Alt. (sinistral specimen) 48 ; maj. diam. 26 millini. 



Alt. (dextral specimen) 50; maj. diam. 27 millim. 



Hall. — Perak (Grubauer). 



At first sight one could easily take this species to be one of the 



numerous varieties of A. j^si'i'ei'siis, but on holding the shell obliquely, 



the very characteristic columellar projection becomes conspicuous. 



This plate appears, from an exterior view, to be thick, but on breaking 



away the wall of the shell, it is seen to be (^uite thin. All the 



numerous specimens collected are quite constant in the possession of 



this peculiarity, although it is more prominent in some than in 



others. 



Cyelostoma sikorae, n. sp. ri. ix, fig. 6. 



Shell solid, moderately umbilicated, general form as figured, some- 

 what shining, milk-white, ornamented with several dark purple-brown 

 bands situated as shown in illustration ; whorls 5I, very convex, with 

 inconspicuous oblique striae or lines of growth ; aperture circular, 

 interior of a light brown colour ; peristome white, rather broadly 

 expanded at outer and basal portions, narrower on columellar part, 

 margins connected by a rather thin calhis ; operculum normal. 



Alt. 25 ; maj. diam. 24 millim. 



Hah. — Fort Dauphin, Madagascar (Sikora). 



This species is chiefly distinguished by its smoothness especially at 

 the umbilical area. In general form it is very near 0. fllodriafziiii, 

 Sowb., but differs in other characters. More rarely C. ftiliorae is 

 almost covered by t^vo or three dark coloured bands which also shew 

 through the interior of aperture. 



KXPL.VNATION OK PL.ATi: IX. 



Fig. I. C'uniis hcddomei, n. sp. 



V\g. 2. I'isania clelicatula, n. sp. 



Fig. 3. Vanikoro ex'pansa, n. sp. 



Fig. 4. Mangilia eiideli, n. sp. 



Fig. 5. Cardium hiingcrfordi, n. sp. 



Y\g. 6. Cydostoma sikorae, n. sp. 



Fig. 7. Xcsta piperata, n. sp. 



P'igs. S — 10. Amphidromus picrakcnsis, n. sp. 



