372 LAND AND FRESHWATER 



expanded peristome to which there is no tendency in A. sculptilis, 

 Bs." 



Major diameter of typical shell, 2*5 mm. 



I should not now call A. crispatus by any means a close ally of 

 A. sculptilis, the subangulate periphery of the latter is very dis- 

 tinctive (vide PI. CXXXIX. figs. 7, 7 a). In 1871 I knew but few 

 species, and sometimes had incorrectly named species for com- 

 parison. The variety referred to and figured I now distinguish as 

 A. asnliiensis. In 1871 I was less inclined to separate this 

 Western form from the Eastern. I find now some are distinctive 

 enough to be considered species. The type of crispatus is from 

 Shibak, Gabir Valley, near the Garo frontier. At Rywuk, at the 

 base of the Garo Hills, 20 miles farther east, I have a very dwarf 

 variety (No. 2G37 B.M.) which I distinguish as var. njtvuJcensis 

 (PI. CLIV. figs. 3, 3 a). 



Looking over these shells again, and referring back to my field- 

 book, has led to the recovery of a species I had thought was lost — 

 one that I named at the time A. moJcarsce, from the village of 

 Mokarsa in the N. Khasi Hills. This species is rather large, is 

 very slightly crenulated, and has no ridge near the constriction. 

 Specimens were sent to Wm. Theobald, who had visited and 

 collected in the country a short time before I was sent on duty 

 there. He introduced the name into his ' Catalogue of the Land and 

 Freshwater Mollusca of India ' (1878), p. 40, as A. makarsce, G.-A. 

 MSS. I now describe and figure a specimen from the typical 

 locality. Theobald gives N. Cachar Hills, which is not correct ; 

 I may have written to him from North Cachar. 



Altc^us crispatus, var. makars.^. (Plate CLVIII. fig. 13.) 

 No. 2638 B.M. 



A. makarsce, Godw.-Aust. (MSS.). North Cachar. 



W. Theobald, Cat. Land & Fresh w. Shells of British India, 1878, 

 p. 40. 



Locality. Makarsa, N. Khasi Hills (or more correct, Maokarsa ; 

 the common Khasi prefix " Mao " meaning a stone). 



Shell depressedly conoid, rather openly umbilicate ; sculpture : 

 distant and strong costulatiou on upper whorls, becoming coarser 

 at the end of the sutural tube, up to the base of same, thence to 

 aperture, very fine close lirse ; colour whitish ; spire low, apex 

 blunt ; suture moderately impressed ; whorls 4, rounded, no ridge 

 near the constriction, expanded at the aperture forward, forming 

 a notch near the inner upper side which is conspicuous; aperture 

 ovate ; peristome double, broad, solid, with the very slightest 

 approach to crenulation on the outer margin within aperture ; 

 columellar margin subvertical, with the outer lip expanded into a 

 flange ; operculum, very black and smooth. 



Size: maj. diam. 3"5; alt. axis 1'5 mm. 



It is much larger than typical crisjpatus. 



