1874.] NEW SPKCIES OF HELICID.E. 609 



range, in the spring of 1868. I again found it abundant above 

 5000 feet on the same range as far east as the Kopamedza ridge. 

 It is essentially a forest species, found in the dead leaves and moss at 

 the foot of the trees. 



This species may be known at once by its regular banding, and in 

 fresh shells by the upper very smooth silk-like surface ; this, however, 

 in old specimens is not observable, the epidermis becoming more 

 coarsely striated. After opening out several specimens to examine 

 the internal arrangement of the barriers, I found one shell to have 

 two vertical parietal lamellae, precisely similar in form, a reduplication 

 of structure to which I think is clearly due the more compound 

 forms of the plicae and lamellae in the Burmese species. 



Helix (Plectopylis) shiroiensis, nov. sp. (Plate LXXIII. 

 fig. 3.) 



Shell sinistral, openly umbilicated, discoidal, thin, light brown, 

 very finely striated. Apex flatly convex; suture slightly impressed ; 

 umbilicus open and deep. Whorls 6, the last rounded, sharply com- 

 pressed on the lower part behind the aperture and descending to it. 

 Aperture broadly lunate, very oblique ; peristome white, continuous, 

 reflected. From the centre of the parietal ridge completing the peri- 

 stome a lamella runs up that side of the whorl for three sevenths of 

 the circumference towards the parietal plication, but does not join 

 it ; and here a short free horizontal lamina lies parallel to and below 

 it. The parietal vertical lamina is simple, with one short support at 

 the lower anterior end ; and below this is another, free, narrow, hori- 

 zontal lamella. Palatal teeth consist of 4, that are horizontal ; the 

 4th is long, narrow, and curving inwards. Between the 3rd and 4th 

 is a vertical double-notched tooth, evidently a compound and repre- 

 sentative of two very oblique plicae. 



Major diam. 0*30 inch, minor diam. 0'28, alt. axis 0*15. 



Hab. This very distinct species occurred most abundantly on the 

 slopes of the peak of Shiroifurar, N.E. of Munipiir, at an altitude of 

 from 8000 to 9000 feet, and there only in the short grass skirting the 

 edge of the forest that clothed the shady north-east slopes of the 

 ridge. This form has the highest range of any of this subgenus yet 

 collected in this part of India. 



In general outward form it is like H. macrompkalus, W. Blf. ; but 

 its nearest local ally is H. nagaensis, which has only one single hori- 

 zontal lamella, and palatal plicae simple and nearly parallel. It is very 

 interesting to find close allies to this shell in the Burmese forms 

 H. perarcta and H . pseudophis, Plate LXXIV. rigs. 4 and 3. These 

 last two are very similar ; but in the former the horizontal lamella is 

 not continuous, and in the latter the vertical barrier is notched. 



Helix (Plectopylis) nagaensis, nov. sp. (Plate LXXIII. 

 fig. 4.) 



Shell sinistral, widely umbilicated, discoid, dull ochry brown, 

 epidermis thick and coarsely striate ; above depressedly pyramidal. 

 Whorls 7, flat, narrow, and those near apex closely wound, the last 



