37G LAND AND FRESnWATKR 



the suture, gradually becomiug finer and much more distant on 

 Hearing- the apex; colour a brown epidermis, coining off; spire 

 slightly depressedly conic, apex small; suture impressed, the 

 sutural tube moderately long; whorls 4; aperture oval, angular 

 above, the obscure crenulatiou on outer margin making it polygonal 

 in outline, suboblique ; peristome double, not very thickened ; 

 columellar margin vertically curved. 



Size: maj. diam. 2'5 ; alt. axis 1"2 mm. 



Until I had compared the two species I had marked this as 

 polijqo7ioma, W. Blf., var. On doing so there was no doubt as to 

 tile distinctness of the Assam shell. In 1874, when describing 

 A. biirtii, I wrote as follows : — 



"It is close to A. pohjgonoma, but the form of constriction is 

 slightly different, the peristome is well crenulated, and the sculp- 

 ture stronger. At Kamakia Hill, near Gowhatt}'', I obtained 

 specimens of an Alycceus still nearer in form to poh/gonoma, only 

 that the sutural tube is about half the length, ending abruptly, 

 while in 'poh/<jonoma it is long and thread-like. I shall describe it 

 in my next paper." 



ALTCiECs KQAsrACiis, G.-A. (Plate CXLIII. figs. 7, 7 a, 7 h.) 



Godwin- Austen, J. A. S. B. vol. xl. pt. 2 (1871), p. 90, pi. iii. 

 figs. 4, 4 a, 4 b. 



Hanley & Theobald, Conch. Ind. p. 42, pi. ciii. figs. 5, 6. Very 

 poor figure and over coloured. 



Theobald, Cat. Hupp. 1876, p. 40. 



G. Nevill, Hand-list, i. 1878, p. 2U0. 



Ori(fiiif(l description : — " Shell subturbinately depressed, openly 

 umbilicated, translucent, varying much in colour from horny amber 

 to piuk- and dark red-browns ; a shining surface, very finely striated 

 under lens, very minute ribbing on the swell of the last whorl; in 

 some specimens a faint coatulation is seen. Spire depressedly 

 conoid, apex very blunt, often darker coloured than rest of the 

 shell. Suture impressed, whorls 4, well rounded, last moderately 

 swollen, sharply constricted and again enlarging into two vertical 

 ridges, that nearest the mouth being the least developed, and only 

 extending across the upper portion of the whorl, being cut off by 

 the peristome. Constriction smooth, sutural tube very short and 

 thick at the base. Aperture oblique, round, slightly angulate above. 

 Peristome more or less distinctly double, inner continuous, outer 

 sli"htly expanded. Operculum multispiral, very concave in front, 

 convex behind, no boss. 



"Major diameter 0*15", minor diam. O'lS" ; alt. 0-09" ; diam. 

 of aperture 0-07" ; sutural tube 0-025". 



" Habitat. On the highest parts of the Khasi and Jaintia Hills. 

 Abundant. 



•' The very short tube and very fine ribbing on the last whorl, 

 and the plain surface of the rest of the shell, combine to make this 

 a very distinct and well-marked species of the genus Ah/canis. 



