116 ON NEW LAND-SHELLS FROM KOROR. [Mar. 5, 
by the peristome ; aperture very oblique, an oblong tooth-like process 
more or less developed near the base of the columellar margin, which 
runs parallel with the inner portion of the peristome: peristome thin, 
single, completely overlapped by the dilatation of the last whorl, or 
sometimes the ‘edge of the whorl forms its outer margin: operculum 
thin, horny, concave on the outside, with about six whorls from a 
minute central nucleus only drawn up, the last whorl about half a 
turn from the mouth. Length 4 millim.; height 3 millim. 
Hab. Koror. 
I am indebted to Dr. Hungerford for a very perfect specimen of 
Arinia scalatella collected in Zebu. The operculum, which is quite 
similar to that of Diplommatina, is situated only a short distance from 
the aperture, being clearly visible looking up the orifice ; there is no 
sign of a constriction. Arinia appears to me to be a good genus, at 
any rate it cannot be placed in the Nicida section of Diplommatina with 
the South-Indian and Ceylonese species; the transverse striations, 
never present in Nicida, are prominent on the upper whorls, and the 
position of the operculum seems to be a marked distinction. 
11. Hextrx (ENpoponTA) KororeEnsis. (Plate XII. figs. 11, 
lla, 114, lle.) 
Shell very narrowly umbilicate, thin, somewhat discoid; spire 
depressed ; colour light brown, blotched with a darker shade, trans- 
versely decussated with about 23 revolving, prominent, thin, wavy 
ribs, otherwise smooth: whorls 5, convex ; peristome thin; aperture 
lunar-circular, furnished with 4 narrow lamelle on the parietal wall 
and 9 on the opposite exterior wall, all of which run into the shell 
parallel with the whorl about 4 millim. Diameter of shell 54-6 
millim.; height 4 millim. 
Hab. Koror. 
A very beautiful species. 
12. Hextrx (ENpoponta) Fusco-zonata. (Plate XII. figs. 12, 
12a, 126, 12c.) 
Shell convex, depressed, thin, pale yellowish brown, transversely 
banded with fuscous bars; spire scarcely raised, obtuse: whorls 6, 
furnished with rather prominent, close, transverse, oblique striations, 
the sutures convex and considerably raised; the last whorl rather 
sharply angled at the periphery: umbilicus small but distinct ; 
aperture lunate: peristome simple, thin; three elongated lamelle 
on the parietal wall, which run some way into the shell, two pro- 
minent but rather shorter ones opposite on the outer wall, near 
the umbilicus and one or two subobsolete ones just beyond these. 
Length of shell 33 millim. ; height 24 millim. 
Hab. Koror. 
Nearest to H. constricta (Semper), but differs considerably in its 
prominent striation, sharply angled periphery, and raised sutures. 
