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Show 334 LIEUT.-COL. H. H. GODWIN-AUSTEN ON [June 18, There is everywhere on the ground and filling the hollows among the rocks a mass of decaying forest leaves. The Niah Hills are exactly similar in general character, but they are from 1000 to 1500 ft. in height. No shells have been collected anywhere in Borneo above 500 ft., except those lately obtained by Mr. Whitehead on Kina Balu and a few collected by Mr. Boxall on Molu, at any rate in N.W. Borneo. I may mention that Belidah and the Sinianan River are both close to Busan." Owing to the number of species in this collection which have to be identified, and to the number that I have had to figure, I have thought it best, as m y leisure time is limited, to submit m y account of it to the Society in two parts. The first of these contains the Cyclosto-maceae, the second will include the Helicacea (amongst which are a number of very fine new species) and the freshwater and brackish water forms. CYCLOPHORUS, Montf. 1. C Y C L O P H O R U S BORNEENSIS, Metcalfe. Cyclostoma borneensis, Metcalfe, P. Z.S. 1851, p. 71; Mart. u. Chem. Conch.-Cab. ed. ii. p. 362, pi. xlvii. figs. 1-3 ; Reeve, Conch. Icon. pi. xii. fig. 50 (1861); von Martens, Preuss. Exped. Ost-Asien, Die Landschnecken, p. 136, pi. iii. figs. 5, 6 (1867). Cyclostoma subinvolvulus, Eydoux et Souleyet, Voy. Bonite, Zool. ii. p. 534, pi. xxx. figs. 22-24. Hab. Niah Hills, Trusan, Labuan (A. Everett). 2. CYCLOPHORUS NIAHENSIS, n. sp. (Plate XXXV. figs. 1, la, 1*.) Shell dextral, depressedly turbinate, widely umbilicated, subangulate ; sculpture, the 2| apical whorls are finely costulate, the anterior portion is longitudinally striate; colour dark ruddy brown, with a few rather close zigzag spots on upper surface, longitudinally striate below, a pale band on the periphery ; spire moderately high ; apex blunt; suture excavated; whorls 4, the last having a well-marked subangulate ridge running with the suture, producing a canal-like depression ; aperture circular, subvertical; peristome pale-coloured, double, thickened, the inner continued forward for 5 millim. ; columellar margin rounded. Size: maj. diam. 44'0, alt. axis 15*5 millim. Hab. Niah Hills. 3. CYCLOPHORUS TENEBRICOSUS, Adams & Reeve. Cyclostoma tenebricosus, Adams and Reeve, Zool. Voy. Samarang, Moll. p. 57, pi. xiv. fig. 6 (1850) ; Mart. u. Chem. Conch.-Cab. ed. ii. p. 250, pi. xxxiii. figs. 12, 13. Leptopoma tenebricosum, Reeve, Conch. Icon. pi. vii. fig. 44 (1862). 4. CYCLOPHORUS COCHRANEI, n. sp. Shell turbinate, solid, keeled, narrowly umbilicated, the umbilicus very nearly concealed by the columellar margin; sculpture a smooth |