1878.] and fresh-water sheJh of Kashmir. 145 



I do not think that N. domina, B. can be separated, as the main dis- 

 tinction seems to be in the texture of the shell ; but in this group the tex- 

 ture varies from horny and sub-diaphanous, in which the striped markings 

 are conspicuous, to creamy porcellanous, in which they are more or less if 

 not wholly obsolete. The difference too in this respect is considerable 

 between the living and dead shells, and largely depends (unless I am much 

 mistaken) on the conditions of climate and alimentation under which the 

 animal lived. 



A slender form is seen in places, with a thinner shell than the type, 

 and indicating a passage to iV. kunaivareiisis, Hutton. A typical example 

 of this variety measures 26'5 x 8 mills. 



In the above and in all the measurements which follow the short axis 

 is measured just behind the aperture. 



N. SINDICUS, B. 



Of this species both dextral and sinistral shells occur, the former most 

 numerously. The size ranges between 27 x 8 and 17 x 3 x 66 mm. for 

 dextral shells and 22 x 7 and 18'2 x 6*2 mm. for sinistral ones out of a 

 large series. It occurs abundantly in the Jhilum valley about Chatur, 

 (above Kohala) at low elevations, and elsew^here less commonly up to 3000 

 feet or thereabouts. 



N. C(ELEBS, B, 



This is a forest species, usually ranging from 5000 feet upwards. It is 

 the most variable species of the group, both as regards size and form rang- 

 ing from 22 X 8 to 14 X 6'2 mm. Some systematists might easily make 

 six or eight species out of the varieties of this shell ; but with a large, but 

 by no means exhaustive, series before me, I cannot venture to specifically 

 separate the very variable shells which a large series displays. I have never 

 seen a sinistral specimen, but JV. hoysianus, B. looks like a sinistral exam- 

 ple of the largest form of coelehs. 



N. ARCUATrs, Hutton. 



Kashmir specimens range between 2 x 6"1 and 13*7 x 5 mills. A 

 single dextral shell found by me measures 12 x 4 mills. It does not seem 

 a common species. The habitat ' Moulmein' given in the Conchologia 

 Indica is of course absurd, but for this and similar blunders I am nowise 

 responsible, since the publishers declined to furnish me with proofs, as the 

 work went through the press. 



N. SEGREaATUS, B. 



A single specimen of what seems a variety of this shell was found, but 

 it had an abnormal look about it. It measures 11 '2 x 5 mm and has the 

 ordinary horny appearance of coelehs and its allies. A smaller form, var. 

 pusillus, would seem to belong to this species and is far from rare on the 

 Chinub valley above 6000 feet. It only measures 9 x 3'8 mills. 



