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Show 1871.] NEWT SPECIES O F 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 compressed 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 peristome 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, horizontal 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 representative 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 Munipur, 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. macromphalus, W . Blf.; but its nearest local ally is H. nagaensis, which has only one single horizontal lamella, and palatal plicae simple and nearly parallel. It is very interesting to find close allies to this shell in the Burmese forms II. perarcta and H.pseudophis, Plate L X X I V . figs. 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 |