2 Godwin-Austen—On new species of the Genus [No. 1, 
animal, its mantle and secreting organs, will be as persistent as the shell 
itself, and that their form and relative positions being more complicated 
and more pronounced than mere outward shape, any divergence in the 
former is of importance and more noticeable and noteworthy in a specific 
sense. The animal, I am sorry to say, I have never had an opportunity of 
examining very closely. 
_ P. shanensis, Stoliezka, (J. A. S. B., 1878, p. 170,) overlooked in my 
first paper, is I find, the same as P. trilamellaris, which I described in the 
P. Z. S., Jany. 1874, from Burmah; so this last title will not stand. 
Ferd. Stoliczka’s fine collection of shells passed to the Indian Museum, and 
Mr. G. Nevill compared the two shells and settled their identity. It 
should be placed after No. 12, perareta. 
Helix (Plectopylis) brachydiscus, n. sp. Plate I, fig. 1. 
Shell dextral, umbilicus very open and shallow, very discoid, rather 
strong, dull umber-brown, epidermis thick with a cloth-like texture, finely 
and beautifully ribbed longitudinally ; in young fresh shells the upper outer 
margin is closely set with a strong regular epidermal fringe about ‘075 
inches long. Spire quite flat, approaching the concave in some specimens, 
the apex itself having a subpapillate form. Whorls 7, the last rather flat 
on the side and angular above, descending at the aperture, which is very 
oblique and oblate. Peristome strongly reflected, thickened, white, the 
margins connected by a well raised ridge, notched above and below. A long 
horizontal lamella is given off from the upper middle portion of this 
towards the vertical parietal lamina, but only extends for 0:20 inches, 
then terminates, but at °15 inches is again developed, becoming thicker and 
higher as it approaches the vertical lamina and ending just short of it, 
in this respect being similar to P. perarcta. 
The parietal vertical lamina is pointed above and gives off from the 
lower basal end a short lamella towards the aperture, and a very slight 
short thin, free lamina is to be seen just below the vertical barriers. Pala- 
tal teeth simple, six, the 2nd, 3rd, 4th and 5th, are the best developed, the 
1st and last are small, 2nd the longest. 
Animal not observed. 
The measurements of the specimen drawn and of the largest specimen 
are respectively— 
Major diam. 0°82. Minor diam. 0°68. Alt. at axis about 0°24 and 
¥ 5 | HOE: i g WitOBBs! ay Ay 33 0:28. 
Haz.—This shell was found by Mr. O. Limborg on the high range of 
Mulé-it, east of Moulmein, Tenasserim, and in the neighbourhood. He 
collected an immense number in a dead bleached state, but only a dozen in 
a fresh state ; the others were, however, exceedingly valuable for proving, 
as above shewn, the persistency of the internal structure in all. 
