390 LIEUT.-COL. H. H. GODWIN-AUSTEN ON [June 18, 
ruddy amber ; spire high, sides slightly convex ; apex jointed ; suture 
moderately impressed ; whorls 7, sides flat on apical, convex below, 
the last rising on the penultimate, antepenultimate the largest ; 
aperture broadly oval, suboblique; peristome double, the outer thin 
and expanded ; columellar tooth small. 
Size: maj. diam. 3°3; alt. axis 6-4 millim. 
Hab. Niah Uills (A. Everett). 
Five specimens occurred in the collection. This is a finely 
developed species and one of the largest from Borneo. 
Oristuostoma, Blyth, 
50. OpIsTHOSTOMA GRANDI-SPINOSUM, h. sp. (Plate XXXVIII. 
figs. 2, 2.a.) 
Shell dextral, depressedly pyramida!, thin, glassy, transparent ; 
sculpture smooth, with lines of growth; the periphery, the upper 
whorls, and the extended free portion of the last whorl are set with 
curved, white, glassy spines, the largest nearest to the aperture; 
each spine rises from a fine transverse rib, above and below the 
whorl, these nearly meeting, a gutter-like fold is produced which 
rises at right angles with the whorl; colour pale amber or sienna- 
brown, with a golden lustre; spire moderately high, conic, sides 
convex ; apex rather sharp; suture impressed; whorls 5 to the 
constriction, whence it leaves the adjacent whorl, and turns sharply 
at right angles upwards in a diagonal direction to the apex of the 
shell, lying closely to the spire, reaching the apex it takes another 
sharp turn to the aperture, which thus rises high above and clear of 
the apex; aperture widely circular, trumpet-shaped; _peristome 
continuous, thin, simple. 
Size: maj. diam. 2°4; alt. axis 1°9; length of longest spine 
1 millim. 
Hab. Niah Hills (4. Everett). 
This is certainly the most beautiful form of a very beautiful and 
minute genus of land-shells, the finest thing that has been discovered 
for along time. It is almost impossible to describe the delicate 
structure of the spines that cover it, rising from the golden-coloured 
whorls. 
51. OpisTHOSTOMA DECRESPIGNYI, H. Adams. 
Plectostoma decrespignyi, H. Adams, Ann. & Mag. Nat. Hist. 
ser. 3, xv. p. 177 (18659); Issel, Moll. Born. Ann. Mus. Civ. 
Genova, vi. p. 439, pl. vi. figs. 13, 15 (1874). 
RapHau.us, Pfeiff. 
52. RaPHAULUS BOMBYCINUS, Pfr. 
Anaulus bombycinus, Pfr. P. Z.S. 1855, p. 105, pl. xxxii. fig. 10, 
male; id. Novit. Conch. i. pl. xvii. figs. 12, 13; H. & A. Adams, 
Gen. Moll. ii. p. 286, pl. Ixxsiil. fig. 3 (1858). 
Hab. Limestone caves (A. Everett). 
