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Show 1889.] LAND-SHELLS FROM BORNEO. 353 Helicina martensi, Issel. Helicina citrinal (Pfr.), var., v. Martens, Malak. Blatt. 1873, p. 161. Helicina martensi, Issel, Moll. Born. Ann. Mus. Civ. Genova, vi. p. 444, pi. vi. figs. 23-25 (1874). GEORISSA, Blanf. 59. G E O R I S S A HOSEI, n. sp. (Plate X X X I X . fig. 11.) Shell elongately conoid, rather solid, imperforate ; sculpture ill-defined spiral liration ; colour ruddy ochraceous ; spire high ; apex blunt; suture impressed ; whorls 4, sides flat, angulate above and below on the periphery, the median side of each whorl being parallel with the axis of the shell, more rounded on the last whorl; aperture oval, oblique ; peristome simple, somewhat thickened above; columellar margin straight. Size: maj. diam. 1*5; alt. axis 1*9 millim. LLab. Borneo (C. Hose, 1889). In Brit. Mus. collection. The square form of the second whorl is peculiar, and distinguishes it from the other Bornean species. Only two specimens are in the collection. The exact locality I have not yet ascertained ; it occurred among a small collection of shells sent to the British M useum by Mr. Hose in May 1889, which Mr. Edgar Smith has kindly let me figure and describe. 60. GEORISSA WILLIAMSI, n. sp. (Plate XXXIX. fig. 10.) Shell elongately ovate, solid ; sculpture indistinct spiral liration, showing strongest on the apical whorl; colour ruddy ochraceous; spire high ; apex blunt, smooth ; suture well impressed ; whorls 4|, convex, the last very ample ; aperture oval, oblique ; peristome simple, sharp-edged; columellar margin straight. Size: maj. diam. 1*7; alt. axis 2*30 millim. Hab. Borneo (C. Hose). In Brit. Mus. collection. Only one example occurred among four specimens of Georissee sent by Mr. Hose to the British Museum, one being G. niahensis, and two others of a new species and very distinct form, which I have named G. hosei. I have named this species after Dr. Williams, who served with Rajah Brooke on the first occupation of the country. 61. GEORISSA NIAHENSIS, n. sp. (Plate XXXIX. fig. 8.) Shell elongately conoid, solid, imperforate; sculpture a very indistinct, ill-defined spiral liration, about 20 on the penultimate whorl, upon a rough surface crossed by transverse lines of growth; colour ruddy ochre; spire high; apex pointed, finely papillate, minutely lirate; suture impressed ; whorls 4\, convex ; aperture oval, oblique ; peristome simple, acute below ; columellar margin straight. Size: maj. diam. 2*3 ; alt. axis 3*6 millim. Hab. Niah Hills (A. Everett). |