MOLLTJSCA. OF INBIA. 389 



"Near A. pleotocheilus, but much larger, the ridge more distant 

 from the peristome and the latter more expanded. In some 

 specimens the edges of the outer whorls in the operculum are much 

 raised and bent inwards as in Cyaihojjoma." 



In 1874, I noted that " A. crenatus was found as far east as 

 Sheroifurar, also at Kezakenomih and Yemai."' 



I described this species in 1871 from specimens collected in the 

 N. Khasi Hills and in North Cachar, 150 miles apart. Giving the 

 13urrail llange as the habitat, the type shell was not indicated — at 

 that time it was not very usual to do so. On going through my 

 collection I very fortunately came across two shells gummed on 

 black paper from which the drawings for Plate IV. 1871, were 

 made. Thus the type can now be put down certainly as from 

 Mokarsain the N.W. Khasi Hills, No. 2642. Examples from Heng- 

 don Peak, N. Cachar Hills, No. 2645 I regard as like type. Others 

 are Jatinga Valley, No. 2578 (rather small), and from the Diyung 

 Valley, 2644. Specimens No. 170, Elanford Collection, were 

 sent to him by me from North Cachar. No appreciable difference 

 can be found between the western and eastern shells, one only, 

 that in the latter tlie last whorl, behind the aperture and witbin 

 the umbilicus, is more rounded — in the western there is a decided 

 keel. Prom the Lhota Naga Hills, one example. No. 2643, must 

 be considered a variety ; it is closer wound with closer umbilicus 

 and whorl subangulate near it, and is worthy of fignring hereafter, 

 with some other species ; to do so now would delay publication, 

 delayed already too long. 



ALTCiEITS CRISP ATUS, Ct.-A. 



I found this species also at Lokah in the Jatinga Valley, North 

 Cachar. No. 2640 B.M. Coll. 



ALTCiETJs DiAGONius, G.-A. (Plate CXLIII. figs. 5, 5«, 5 b.) 

 No. 2678 B.M. Type. 



J. A. S. B. 1871, vol. xl. p. 88, pi. iii. figs. 2, 2a, 2b. 



Alycceus diago^iius, Hanley & Theob. Conch. Ind. p. 42, pi. ciii. 

 go-. 1. — This figure is quite useless for any purpose of identih- 

 cation ; the shell is drawn viewed from below only, and is over- 

 coloured. 



Alycceus diagonus, Theob. Supp. Cat. p. 39. 



Alycceus cliagoniiis, Nevill, Hand-list, i. p. 290. 



Origincd clescri'ptwn : — "Shell closely umbilicated, turbinate, thin, 

 translucent, pale amber or pinkish colour, finely but distantly 

 costulated on the two last whorls, closely so on the inflated portion 

 of the last : spire conoid, apex blunt, suture well impressed ; 

 whorls 4, rounded, constricted closely near base of the suturaltube, 

 then swelling largely towards the mouth, the commencement of the 

 swell forming a diagonal or recurved ridge above ; constriction 

 smooth, sutural tube 0*053 inch ; aperture diagonal, circular ; 



