GYLIAUCHEN. 213 



parietal strong, deeply entering, bipartite ; between it and the 

 columellar there are three smaller ones. Peristome free, 

 simple, thin, rather broadly expanded, rather deeply sinuated 

 between the two lamellae. Diam. max. 3, alt. 2%, diam. of 

 aperture with peristome 1 mm. (Mlldff.). 



Perak: Bukit Poudong(R. Hungerford) ; Kelantan(Sykes). 



Hypselostoma bensonianum v. MLLDFF., Journ. Asiat. Soc. 

 Beng., vol. 55, pt. 2, 1886, p. 306. Hypselostoma hunger- 

 fordianum v. MLLDFF., Proc. Zool. Soc., 1891, p. 337, pi. 30, f. 

 7, la. SYKES, Journ. of Malacology, ix, p. 61. 



"Although I have not yet been able to compare authentic 

 specimens of H. bensonianum Blfd. from Ava, I am convinced 

 that the Perak form cannot be combined with it and that it 

 constitutes a good new species. It is somewhat more conical 

 and comparatively higher than the Ava form, the upper 

 whorls are more convex, not 'planulate' as Blanford has it, 

 the last whorl is more detached and stretches to the right; 

 facing the shell the whole aperture is visible in H. bensonia- 

 num, only part of it in H. hungerfordianum. There are seven 

 instead of four teeth. I suppose that the additional fifth tooth 

 mentioned by Blanford means that the parietal tooth or 

 lamella is divided as in the Perak species, but the latter pos- 

 sesses three more between the parietal and columellar lamel- 

 lae" (Mlldff.). 



The angular lamella is very slender and runs close and 

 parallel to the anterior part of the parietal (fig. 4). The two 

 infraparietals are long and larger than the supracolumellar 

 lamella. Upper and lower palatal plicae strong, some small 

 interpalatals between them. In the basal position are one or 

 more little plicae. All the lamellae and plicae are seen to be set 

 with minute points. Under a low power they seem as if cov- 

 ered with little sand grains. 



The surface is minutely and superficially rugose. Apex is 

 minutely granulose. The peristome is flatly reflected along 

 the columellar margin, the outer merely expanded. 



This species has a longer, less ascending neck and more de- 

 veloped accessory plicae and lamellae than G. bensonianus. It 

 is paler than G. transitans, has a longer neck, longer angular 

 lamella and more teeth. 



