76 Contributions to Indian Malacology. [No. 2, 
and below. Spire quite flat, apex not rising above the surface, suture 
impressed. Whorls 6}—7, narrow and closely wound, slightly convex 
above ; the last much broader, rounded at the periphery and beneath, 
descending abruptly close to the mouth. Umbilicus shallow, exposing 
all the whorls. Aperture more nearly horizontal than vertical, sub- 
circularly lunate. Peristome slightly thickened, expanded throughout, 
margins joined by a rib, from the centre of which a lamina sometimes 
runs up to the parietal plication, but is frequently interrupted a short 
distance within the aperture, and is always thicker and higher near 
the mouth than further back. Parietal plication consisting of a verti- 
cal lamina in front, and a second, slightly oblique, just behind the 
first, giving out the interrupted lamina running to the aperture from 
the top, and a shorter horizontal lamella from the bottom; the hinder 
with small re-entering supports above and below. Beneath both is a 
narrow free thread-like horizontal lamella. Palatal teeth 5: Ist, 2nd, 
3rd and 5th horizontal, 4th vertical and stouter than the others; Ist 
and 2nd longer than the remainder. 
Millem. inch. 
Major diameter, ......0.0-c000.+s« 16 0.65 
Minor ditto ucts oct. .decceielh 13 0.52 
Height erat ths. dbase Sedat 5 44 0.18 
Habitat —Prome : rare. 
Of this unquestionably distinct species but 3 or 4 specimens were 
found by Mr. Fedden and myself. Both the external form and _plica- 
tion differ from those of all allied species. It is especially distinguish- 
ed by its rounded periphery, wider last whorl, and its irregular 
non-decussated sculpture externally, and internally by the double 
parietal lamina. 
Section ? 
15. H. po.ypLevris, n. sp. 
Shell openly umbilicated, trochiform, rather solid, white, (probably 
horny in living specimens,) obliquely and closely costulated. Spire 
conoid; apex rather obtuse; suture impressed. Whorls 6, convex, 
slowly increasing ; the last not descending, surrounded by a raised 
thread-like keel, convex beneath, and somewhat sinuously radiately 
costulated around the deep and pervious umbilicus, Aperture oblique, 
