1876.] collected fairing tlie Dajla Expedition. 175 



ing angular notch, the outer is similarly notched and then expanded and 

 folded into a spout-shaped form. Operculum not seen, probably as in 8. 

 hispidum. 



Alt. - 36, major diam. P05, minor diam. - 92, diam. apert. 0*45 in. 



Hab. — Two specimens only were obtained near Dihiri Parbat, on the 

 outer sandstone range. 



This 8piraculum is quite distinct from 8. hispidum, for which I 

 mistook it when found, and consequently omitted to search for more 

 examples. In the form of the sutural tube it most nearly resembles 

 8. Avanum, W. Blf., thus differing very considerably from 8. hispidum, 

 in which that part is broad and curves quite over and across the suture in 

 well-grown shells (pi. vii, fig. 4). The most notable point of difference, 

 however, is the expansion of the outer lip into a tube-like process, in which 

 respect the species shews its very close affinity to the genus Pterocyclos. 



Alyc^tts Khasiactts, G-A. 



Hab. — One specimen of the true typical form was found in the Yetay 

 ravine, Dikrang Dhiin. 



AiiYCEUs Khasiactts, var. 



The rest of this type from other parts of the hills, however, differ from 

 the Khasi form, in the ridge in front of the constriction being single, 

 and the peristome more thickened and reflected. But in size, sculpture, 

 and the short thickened sutural tube, as well as in the operculum, no change 

 is to be detected. 



Hab. — Valley of the Dikrang and Borpani. 



Alycjeits ceisbatfs, Gr-A. 



Hab. — A conical form of this shell was obtained in the Burroi gorge. 



Alycjetjs Theobaldi, Bs., var., PL VII, Fig. 10. 



Is of the same form as A. Theobaldi from Cherra Poonjee and the Garo 

 Hills, only that while tbe operculum in the latter is exceedingly closely wound, 

 quite smooth in front, and black (and I have examined some dozens of shells), 

 in the former the concentric whorls are wider apart, have a central 

 circular hollow space, and are white. The ribbing of the swollen j)ortion 

 in the Dafla shell is exceedingly minute, and this, I note, is a common 

 character, holding good almost without exception,, of all the species in 

 the Dafla Hills. There is, moreover, a slight difference in the contraction 

 of the whorl near the umbilicus, but I hesitate to separate two such 

 close forms, notwithstanding that if dozens of each variety were thrown 

 together, they might all be resorted without a mistake, and I have 



