MOLLUSC! OF INDIA. 377 



" A variety has the aperture less circular, with a distiact notch 

 below. In every other respect it is identical, but a little smaller. 

 All found in Shillong Hill Station were of the last type." 



This species, only smaller in size and not with the red coloration 

 of the typical Khasi Hills form, occurred on the Trigonometrical 

 Hill Station of Angaoluo in the North Naga Hills. It measures 

 3 mm. in major diameter as against 3*5 ram. of the type shell. I 

 have true hhasiacus from Jawai in the Jaintia Hills, from Mairang 

 and Shillong. I also found it in the valley of the Barak, Munipur, 

 and at Asalu in the North Cachar Hills. 



Among a large series of this species variation may be noted in a 

 specimen here and there. The two ridges behind the peristome 

 are only slightly developed, blend and nearly disappear. Such 

 examples might be considered, if singly and separately collected, to 

 be a different species. The short sutural tube then shows what 

 the true relationship is. 



Altc^us (CrcLORTx) MANGUTENsis, n. sp. (Plate CXLVI. figs, d, 

 5 a.) No. 2518ii.M. 



LocaUUj. Mangut Valley, Jaintia Hills (Qodwln-Austen), Jawai 

 (one specimen sent to Wm. Elanford by me mounted on a glass 

 slide with otiphorus from Darjiling). 



Shell globosely turbinate, perforation Tiidden by oricer lip ; 

 sculpture smooth on the two apical whorls, succeeded by close, fine 

 costulation, 5, rather close, on the short sutural tube ; colour pale 

 ochraceous, some richer, some colourless ; spire moderately high, 

 conic ; apex blunt ; suture impressed ; whorls tumid, 4 ; aperture 

 circular, nearly vertical ; peristome double, not thickened ; 

 columellar margin an arc of a circle ; operculum dark coloured. 



Size : maj. diam. 3*2 ; alt. axis 2*2 mm. 



With wider knowledge of these small shells, and a large series 

 for comparison, I consider this species worthy of specific distinction. 

 It was first noticed in 1871, when, in the J. A. S. B. p. 93, it was 

 recorded as Ahjcceus otiphorus, Bs., var., pi. v. fig. 6. I then said : 

 " This is a closely-allied shell to Benson's type, differing, however, 

 in its smaller size, stronger sculpture, and in having very fine lines 

 of sculpture on the constriction, close behind the peristome. . . . 

 Habitat. Wooded slopes of the Mangut River and Marangsip Peak, 

 Jaintia Hills. Eather a rare shell. The same variety of Ah/cmts 

 otiphorus was also obtained in North Burma by Dr. Anderson when 

 proceeding with the Mission to Yunnan." This last notice requires 

 verification if I can lay my hand on the specimen referred to. 



In the P. Z. S. (1893) shells collected by Mr. Wm. Doherty in 

 the Eastern Naga Hills, led me to write a paper on species of 

 Alycsei, and at page 593 I described Alycceus {Dioryx) yranum. 

 I must here say the subgenus Dioryx of Benson canuot receive this 

 shell. Dioryx is confined to forms like A. urnula, the type. 

 Following the original description I wrote : — 



'• This species is only half the size of its nearest ally, a variety 



2h 2 



