352 LIEUT.-COL. H. H. GODWIN-AUSTEN ON [June 18, 
I have much pleasure in naming it after Mr. John Evans, who did 
so much to promote the exploration of the Bornean caverns. 
PuprinE.ia, Gray. 
Pupinella borneensis, Pfr. 
Pupinella borneensis, Pfr. P. Z.S. 1861, p. 389, pl. xxxvii. fig. 1. 
Mecatomastoma, Guilding. 
Megalomastoma doria, Issel. 
Megalomastoma dorie, Issel, Moll. Born. Ann. Mus. Civ. Genova, 
vi. p. 430, pl. vi. figs. 18, 19 (1874). 
Hab. Sarawak (Doria and Beccari). Five examples. 
57. MEGALOMASTOMA ANOSTOMA, Benson. 
Cyclostoma anostoma, Benson, Ann. & Mag. Nat. Hist. ser. 2, x. 
p- 269 (1852). 
Megalomastoma anostoma, Issel, Moll. Born. Ann. Mus. Civ. 
Genova, vi. p. 429, pl. vi. figs. 16, 17 (1874). 
Cyclostoma sectilabrum, Mart. u. Chemn. Conch.-Cab. ed. ii. 
p. 377, pl. xlvii. figs. 11, 12. 
Cyclostoma leferi, Morelet, Journ. de Conch. 1861, p. 176. 
Megalomastoma lowei, Sowerby, Thesaur. Conch. iii. pl. eclxii. 
fig. 1. 
Hab. Trusan and Niah Hills (Zverett). 
He.icina, Lamarck. 
58. HELICINA USUKANENSIS, n. sp. (Plate XXXIX. fig. 7.) 
Shell dextral, lenticular, solid, convex below; sculpture nearly 
smooth, fine lines of growth, crossed by irregular diagonal striation ; 
colour pale ruddy madder-brown, pale straw-colour below and on 
periphery, an indistinct band seen inside the aperture; spire de- 
pressedly pyramidal, sides flatly convex ; apex blunt ; suture linear ; 
whorls 4, regularly increasing, sides very flat, the last bluntly cari- 
nate, with an obsolete band below; aperture acute, white, slightly 
reflected; columellar margin short, thickened, the callous short and 
semicircular. 
Size: maj. diam. 7°10; alt. axis 3°75 millim. 
Hab. Usukan Island, Borneo (A. Everett). 
This species approaches very near to H. martensi in form of the 
columellar margin, but differs in colour and the form of the carinate 
periphery, as also in its flatter-sided spire. 
Helicina borneensis, v. Martens. 
Helicina borneensis, v. Martens, Monatsber. d. Berlin. Akad. 
1864, p. 120; Reeve, Conch. Icon. pl. xxx. fig. 267 (1873). 
Hab. Singkawang (v. Martens). 
Helicina crossei, Semper. 
Hab. Palawan. In Brit. Mus. 
