226 F. Stoliczka- Notes on Terrestrial Mollusca. [No. 3, 



at the upper periphery of the last whorl there is usually a single 

 brown band traceable. Specimens devoid of the cuticle appear 

 white ; one of this kind was figured by Hanley and Theobald under 

 the name H. galata, as already alluded to. 



Specimens from Pegu and Upper Burma, perfectly agree with 

 those from Moulmein, except that the aperture is generally a 

 little less deflexed. Large specimens, measuring in the longer 

 diameter more than 20 m.m., often become very flat. 



Specimens from Assam (Tezpore) have the whorls more regularly 

 increasing, than Burmese specimens, they possess, therefore, a 

 more orbicular shape, and the upper side is conspicuously convex. 

 The cuticle becomes quite smooth with advanced age, and the shells 

 are often encircled with numerous broader and narrower reddish 

 brown bands. Full grown specimens (22 — 25 m.m.) from the 

 Khasi hills and from Darjeeling appear to be peculiarly thin, 

 and when well preserved they have the cuticle very rough and 

 hairy ; they are also generally marked with numerous brownish 

 bands. In all specimens from the three last named localities the 

 aperture is much less deflected and the inner lip longer, than in 

 those from Tenasserim and Pegu, thus giving the shell apparently 

 a very different aspect from the southern jwocumbens, but the gradual 

 change from one form into the other, as well as the variations to 

 be noticed in one and the same locality, clearly shew that all belong 

 to one and the same species ; at least there is not one constant 

 character by which they could be separated. The following measure- 

 ments exhibit the amount of variation. 



Moulmein. Pegu. Assam. Khasi Darjeel- 



hills. ing. 

 ah c d e f 

 Larger diam. (including expan- 

 sion of lip), 18-5 23-0 18-0— 185 23-0 21*5 



Width of last whorl near the 



aperture, 65 7*8 66—5.5 8 8'0 



Smaller diameter, 140 18'3 143— 15-2 177 165 



Height of shell, 93 102 9-0— 10-0 93 95 



„ of aperture, 74 95 82— 8-5 8'5 85 



Width, „ 93 12 9-8—9-0 115 11-0 



Smaller diam. : larger diam. 075 0-79 079-0-82 079 076 



Height of aperture : width, ... 079 079 083—0 94 074 077 



— -v- — * 



tprocum- procum- delibrata. 



bens, bens, 

 a typical ; b, approaching the type. 



