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 oi Diplommatina, is situated only a short distance from 

 the aperture, being clearly visible looking up the orifice ; there is no 

 sign of a constriction. Ari7iia 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. Helix (Endodonta) kororensis. (Plate XII. figs. 11, 

 11 a, 11 6, lie.) 



Shell very narrowly umbilicate, thin, somewhat discoid ; spire 

 depressed ; colour liglit 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 lamells 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 5i-6 

 millim. ; height 4 millim. 



Hab. Koror. 



A very beautiful species. 



12. Helix (Endodonta) fusco-zonata. (Plate XII. figs. 12, 

 12o, V2b, 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 lamellae 

 on the parietal wall, which run some way into the shell, two pro- 

 minent but rather shorter ones op|)osite on the outer wall, near 

 the umbilicus and one or two subobsolete ones just beyond these. 

 Length of shell 3j millim. ; height 2\ millim. 



Hab. Koror. 



Nearest to H. constricta (Semper), but differs considerably in its- 

 prominent striation, sharply angled periphery, and raised sutures. 



