187 9.] Plectopylis of the Family Helicide. 3 
This form should be placed between No. 11, P. pseudophis, and 
No. 12, perarcta in my key to the species, vide P. Z. S., 1874, pp. 612, 618. 
Helix (Plectopylis) Oglei, n. sp., Plate I, fig. 2. 
Shell dextral, widely umbilicated, sub-discoid, dull pale brown with 
close-set. sienna markings crossing the whorls. Epidermis thick and nacre- 
ous, and somewhat rough. Apex flat but slightly concave, the whorls rising 
regularly. Whorls 8, the last descends slightly near the aperture, which is 
very oblique and ovate. Peristome slightly reflected, white, continuous on 
the body whorl, but not strongly developed. Palatal teeth 6, 3rd, 4th and 
5th equal, 6th longer, double. On the parietal side is one single vertical 
lamina with buttress-like supports on posterior side above and below. 
Major diameter 0°65 ; minor diam. 0°58 ; alt. axis 0-25 inches. 
Haz.—The above shell was discovered near Sadiya, Assam, by Mr. 
M. T. Ogle of the Topographical Survey, after whom I have much plea- 
sure in naming it. Mr. Ogle collected and sent me a very fine collection 
of land-shells from this eastern part of the Assam valley, comprising many 
new and interesting species, which I am engaged in working out. The 
nearest species to P. oglez is serica of the Burrail Range, but the former is 
very much larger and may be known at once by its less flattened form and 
darker rougher surface. In the synoptical table of this sub-genus, P. Z. S., 
1874, p. 612, this shell should follow No. 1, P. serica, G.-A. 
Helix (Plectopylis) brahma, n. sp., Plate I, fig. 3. 
Shell sinistral, rather closely umbilicated, discoidal, pale ochry-brown, 
finely and regularly striate. Apex flat yet slightly convex. Whorls 7, 
last angular above and rounded below, slightly compressed behind the 
aperture and hardly descending. Aperture lunate, oblique. Peristome 
slightly reflected and thickened, white, continued as a callus on the body 
whorl. 
Tnternal structure complicated ; the parietal vertical lamina is strong 
and gives off a short horizontal lamella at the lower end; above this are 
two other and parallel fee lamell,* both short, the lower being the best 
_ developed ; the upper is occasionally united to the upper end of the vertical 
barrier. There is a very thin thread-like lower free lamella extending to the 
-peristome and uniting with the parietal callus. The palatal plice are 
arranged in two rows, those of the anterior row are few and large, four in 
) * Tn three cases out of twelve I examined, the upper Jamelia was united to the 
yertical barrier, but this does not affect the order of position and arrangement of all 
“i hese processes in this species, 
