352 LIEUT. -COL. H. H. GODWIN-AUSTEN ON [JuUC 18, 



I have much pleasure in naming it after Mr. John Evans, who did 

 so much to promote the exploration of the Bornean caverns. 



PupiNELLA, Gray. 

 Pupinella borneensis, Pfr. 

 Pupinella borneensis, Pfr. P. Z. S. 18GI, p. 389, pi. xxxvii, fig. 1. 



Megalomastoma, Guilding. 



Megalomastoma dories, Issel. 



Meyalomastoma dories, Issel, Moll. Born. Ann. INIus. Civ. Geneva, 

 vi. p. 430, pi. vi. figs. 18, 19 (18/4). 



Hab. Sarawak (Doria and Beccari). Five examples. 



57. Megalomastoma anostoma, Benson. 



Cyclostoma anostoma, Benson, Ann. & Mag. Nat. Hist. ser. 2, x. 

 p. 269 (1852). 



Meyaiomasto7na anostoma, Issel, Moll. Born. Ann. Mus. Civ. 

 Geneva, vi. p. 429, pi. vi. figs. 16, 17 (1874). 



Cyclostoma sectilabrum, Mart. u. Chemn. Conch. -Cab. ed. ii. 

 p. 377, pi. xlvii. figs. 11, 12. 



C]idosloma leferi, Morelet, Journ. de Conch. 1861, p. 176. 



Megalomastoma lowei, Sowerby, Tliesaur. Conch, iii. pi. cclxiii. 

 fig. 1. 



Hab. Trusan and Niah Hills {Everett). 



Helicina, Lamarck. 



58. Helicina usukanensis, n. sp. (Plate XXXIX. fig. 7.) 

 Shell dextral, lenticular, solid, convex below ; sculpture nearly 



smooth, fine Hues of growtii, crossed by irregular diagonal striation ; 

 colour pale ruddy madder-brown, pale straw-colour below and ou 

 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. pi. xxx. fig. 267 (1873). 

 Hab. Singkawaug {v. Martens). 



Helicina crossei. Semper. 

 Hab. Palawan. In Brit. Mus. 



