350 LIEUT.-COL. H. H. GODWIN-AUSTEN ON [JunC 18, 



ruddy amber ; spire Ingh, 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 ex})anded ; columellar tooth small. 



Size : maj. diam. 3"3 ; alt. axis6'4 millim. 



Hab. Niah Hills {A. Everett). 



Five specimens occurred in the collection. This is a finely 

 developed species and one of the largest from Borneo. 



Opisthostoma, Blyth. 



50. Opisthostoma GRANDi-spiNosuM, n. sp. (Plate XXXVIII. 



figs. 2, 2 a.) 



Shell dextral, depressedly pyramidal, thin, glassy, transparent ; 

 sculpture smooth, with lines ot 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 wliorl, 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, tliin, simple. 



Size: maj. diam. 2*4; alt. axis \'9 ; length of longest spine 

 1 millim. 



Hah. Niah Hills {A. 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 a long 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. 1/7 (lH6o) ; Issel, Moll. Born. Ann. Mus. Civ. 

 Geneva, vi. p. 439, pi. vi. figs. 13, 15 (1874). 



Baphaulus, Pfeiff. 



52. Raphaulus bombycinus, Pfr. 



Anaulus bombycinus, Pfr. P. Z. S. 1855, p. 105, |)1. xxxii. fig. 10, 

 male; id. Novit. Conch, i. pi. xvii. figs. 12, 13; H. & A. Adams, 

 Gen. Moll. ii. p. 286, pi. Ixxxiii. tig. 3 (1858). 



Hab. Limestone caves (./I. Everett). 



