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Show 1891.] LAND-SHELLS FROM BORNEO. 31 Having seen but one specimen, I at first thought that this shell was only a reversed variety of D. hugonis, and that the depression was the result of some injury. I now find that Dr. Hungerford has two specimens, and a young shell in Mr. Everett's collection from the Niah Hills is evidently of the same species. DYAKIA REGALIS. Helix regalis, Benson, Ann. Mag. N. H. ser. 2, vol. v. p. 215 (1850); Reeve, Conch. Icon. pi. xcvi. fig. 526 (1852); Pfeiff. Monogr. Helic. iii. p. 52 (1853), et v. p. 82 (1868); id. in Mart. u. Chemn. Conch.-Cab. ed. ii. p. 377, t. cxli. figs. 5, 6. Helix vittata, Adams & Reeve, Zool. Voy. Samarang, Moll. p. 60, pi. xv. figs. 7 a-c (1850) ; Metcalfe, P. Z. S. 1851, p. 70. Ryssota (?) regalis, Wall. P. Z. S. 1865, p. 407. Nanina regalis, v. Martens, Preuss. Exped. Ost-Asien, Landschneck. p. 225 (1867). Var. UNICOLOR. N.W. Borneo (Everett). DYAKIA BUSANENSIS, n. sp. (Plate II. fig. 1.) Shell discoid, sharply keeled ; umbilicated; sculpture above finely decussate, produced by rather irregular transverse lines of growth crossed by very longitudinal hair-like strise ; below glassy, no spiral striae, a few transverse lines; colour pale ashy white, with a single broad band next to the periphery and suture; spire low, flatly pyramidal; apex rounded ; suture a mere thread; whorls 5, sides very flat; aperture semilunate, oblique; peristome thin ; columellar margin oblique, not reflected, very weak. Size: maj. diam. 19'0, min. 17'2; alt. axis 6" 7 millim. Hab. Busan Hills (A. Everett). Dyakia janus. Helix janus bifrons, Chemn. Conch.-Cab. xi. p. 307, t. 213. figs. 3016, 3017. Helix janus, Pfeiff. Monogr. Helic. i. p. 77 (1848), et v. p. 83 (1868); Reeve, Conch. Icon. pi. xci. fig. 494 (1852). Nanina albersi, v. Martens, Monatsber. Akad. Berlin, 1864, p. 265 ; id. Preuss. Exped. Ost-Asien, Landschneck. p. 224, et xi. fig. 3 (1867). Ryssota (!) janus, Wall. P. Z. S. 1865, p. 407. Nanina janus, v. Martens, Preuss. Exped. Ost-Asien, Landschneck. p. 226, t. xi. fig. 4 (1867). Dyakia amphidroma. Helix janus bifrons, var., Rousseau in Hombr. et Jacq. Voy. au Pole Sud, Zool. v. p. 11, pl.v. figs. 1-3 (1854). Helix martini, Pfeiff. P. Z. S. 1854, p. 149; id. Monogr. Helic. v. p. 300 (1859) ; Reeve, Conch. Icon. pi. cxciii. fig. 1356 (1854). Nanina amphidroma, v. Martens, Monatsber. Akad. Berl. 1864, |