ke 
fyt- 
342 LIEUT.-COL. H. H. GODWIN-AUSTEN ON {June 18, 
Rarostoma, Benson. 
26. RutosToMA CAVERN, n. sp. (Plate XXXVI. figs. 1, 1 a.) 
Shell dextral, discoid, rather solid, very widely and perspectively 
umbilicated ; sculpture smooth, with fine transverse lines of growth ; 
colour pale umber-brown ; spire just raised above last whorl: apex 
flat; suture well impressed ; whorls 4, well rounded, the last sepa- 
rated from the others for a distance of 4 millim., the sutural tube lying 
about midway, rather nearer to the aperture, it is short and recurved ; 
aperture circular, oblique; peristome double, inner simple, continuous, 
the outer expanded on the exterior margin and into a very slight 
wing at the sutural side. 
Size: maj. diam. 15:0, min. 10°5; alt. axis 3°25; diam. body- 
whorl 6:0 millim. 
Operculum multispiral, shelly in front and slightly convex, double, 
horny, polished, multispiral at inner side. 
Hab. Sarawak proper. 
The first specimens sent home by Mr. Everett were four in number, 
obtained when making excavations in certain caves in the limestone 
formation, and marked Cave A. The specific name is only given in 
allusion to this work, not that the species habitually lives in such 
places. These are somewhat larger than the one described and 
figured, being in major diam. 19 millim., minor diam. 14 millim. 
27. RuiosTOMA GWENDOLEN4, n. sp. (Plate XXXVI. figs. 2, 
2a.) 
Shell dextral, globosely discoid, solid, openly umbilicated; sculpture 
a thick finely striate epidermis; colour dark umber-brown, with 
transverse bands of a darker colour, towards the apex zigzag bars 
are seen where this epidermis has come off ; spire low; apex papilli- 
form ; suture well impressed ; sutural tube 2 millim. in length, taper- 
ing and directed forward; whorls 4}, rounded, the last separated 
from. the other whorls from the base of sutural tube; aperture 
circular ; peristome double, the inner lip thin and continuous, the 
outer expanded and reflected on the outer margin. 
Size: maj. diam. 15°25, min. 11°75; alt. axis 5:0; diam. body- 
whorl 7°5 millim. 
Operculum thin, flat, smooth, multispiral, and shelly in front, 
smooth and horny behind, with a central circular hole. 
Hab. Niah Hills (A. Everett). 
Only one specimen in the collection, which is quite distinct from 
all other species of this genus from Borneo in its more closely round 
and globose form. 
28. Ru1ostoMA HUNGERFORDI, 0. sp. 
Shell discoid, umbilicated ; colour rich dark madder-brown, crossed 
with broad regular V-shaped markings for 4 whorls, where the varix 
of an old aperture is seen; in front of this the markings are less 
developed ; spire perfectly flat ; apex papillate, scarcely raised above 
the succeeding whorls ; suture well impressed, the tube small, adhering 
