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Show 1891.] LAND-SHELLS FROM BORNEO. 45 lunate ; peristome reflected upon the columellar margin, which is very oblique. Size : maj. diam. 9*3 ; alt. axis 8*0 millim. Llab. Tiga Island, Borneo (A. Everett). Only one specimen in the collection. HELIX (GEOTROCHUS) SUBFLAVA, n. sp. (Plate II. fig. 4.) Shell pyramidal, keeled, rather flat on the base, narrowly perforate ; sculpture, rough papillate dottings arranged transversely ; colour ochre ; spire high, sides flat; apex very blunt; suture linear ; whorls 6, sides flatly convex ; aperture quadrate ; peristome very thin; columellar margin much reflected, perpendicular. Size: maj. diam. 7*0; alt. axis 6*5 millim. Hab. Borneo (Sir H. Low, in coll. Dr. Hungerford). This is the first species of this genus found in Borneo. The type species is from Ternate, and the genus ranges through New Guinea to the Solomon Islands, where it appears to be abundant ; whether the animal is the same throughout this extended distribution is yet to be found out. Helix pulvisculum, Issel, Ann. Mus. Civ. Genova, vi. p. 406, t. v. figs. 24-27 (1874). Locality not given. There are some species of Helicostyla and Cochlostyla represented in Mr. Everett's collection, but these are from Palawan. As this is a large island with a Molluscan fauna somewhat different from that of Borneo, I think it better to record them in a separate paper, in which I shall describe the shells from Palawan collected by Mr. J. Whitehead. COCHLOSTYLA JAYANA. Hab. Lobok iVntu, Batang Lussen District (Hose). DESCRIPTION OF THE PLATES. Explanation of the Abbreviations. Al.Gd. Albumen-gland. ant. Anterior. C. Central tooth. B. Dart-sac. d. Calcareous dart. E. Retracted eye-tentacles. Gen.Ap. Generative aperture. h.d. Hermaphrodite duct. K. Kale-sac. l.d.l. Left dorsal lobe. l.s.l. Left shell-lobe. M. Mouth. M.G. Mucous gland. m.G-B. Mucous gland of dart-sac. ov. p. P.Ap. post. r.d.l. r.m. r.m.P. r.s.l. Res.Ap. Bes. Or. Sp. Sp.Ap. v.d. X. Oviduct. Penis. Penis aperture. Posterior. Right dorsal lobe. Retractor muscle. Retractor muscle penis. Right shell-lobe. Respiratory aperture. Respiratory organ. Spermatheca. Spermatheca aperture. Vas deferens. Position of calcareous dart |