MOLLITSCA OF TXDrA. 355 



" A dwarf vfirietj' fvar. nana, G.-A.] ocoars on Shengorh Peak 

 [No. 2499 B.M.], onlj- 0-09 in. alt., nob so expanded^ near tlie 

 aperture, and with the plication less developed. On the Tdnir 

 ridge, at 4000 feet, the same shell, of ordinary size and with the 

 :same character of the aperture, occurs, showing an interesting and 

 gradual change in form ; the operculum is also different, being 

 pale coloured, multispiral, and fiatl}' concave in front. 



" This form is in this respect much nearer to A. dii/ihitus, and 

 might be separated under the title var. suhdiuitatus" ' (No. 2498 

 B.M.) 



It is a mere varietj-. differing in its smaller size, more depressed 

 and rounded spire, and liner costulution. 



A. cluflaensis may also be known from the Darjiling dirjitatus by 

 the much coarser and more distant costulation of the latter. 



On the Niosi Ridge, Dafla Hills, the specimens taken (No. 2500 

 B.M.) differ slightly from the type. 



Alyc^tjs DiKHiNGENsis, u. sj). (Plate CXLVIIE. figs. 6, 6 a.) 



Locality. Toruputu Peak, Dafla Hills (Type No. 2533 B.M.) 

 (Godivin- Austen). 



Shell somewhat depressedly turbinate, openly umbilicated, the 

 costulation next sutural tube is very fine and close; sculpture 

 becoming coarser but still close towards the apex ; colour stony- 

 white ; spire pyramidal, apex small ; suture impressed, tube long ; 

 whorls 4|, regularly increasing, constriction between i)eristome and 

 sutural tube short ; aperture irregularly circular, nearly vertical ; 

 peristome double, inner crenulated, five deep notches, the outer 

 ■continuous, sharply turned back. 



Size : maj. diara. 6-0 ; ait. axis 3-3 mm. 



This species might be easily mistaken for A. Miitensis, the peri- 

 stome being very similar, particularly when viewed from the side, 

 but the costulation is very different, as also the crenuhition on the 

 side of the aperture. It is also very close to A. crennlatas of the 

 Darjiling Hills. 



Alyc^us gemma, n. sp. (Plate CXLIX. figs. 6, 6 a.) 



Locality. No. 7 Camp, Dikrang Valley, Dafla Hills (Type 

 No. 2601 B.M.) (Godivm-Anstm). 



Shell umbilicated, depressedly conoid; sculpture: none on the 

 upper whorls, a few indistinct, fine, costate ribs at suture ; colour 

 white ; spire low, conoid, apex blunt ; suture moderately impressed, 

 the sutural tube short; whorls 4, well rounded, the" constricted 

 area is crossed by two ridges, the posterior broad, the anterior 

 narrow and more conspicuous ; aperture circular, angulate on upper 

 margin ; peristome double, angulate on lower margin, the outer 

 very slightly reflected. 



One specimen from this locality only differs in being more solid, 

 and has distant costulation on half the 1st whorl. 



Size : maj. diam. 2 8 ; alt. axis 1-4 mm. 



