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 my leisure time is limited, to submit my account of it to 
the Society in two parts. The first of these contains the Cyclosto- 
maceze, the second will include the Helicacea (amongst which are 
a number of very fine new species) and the freshwater and brackish 
water forms. 
CyciopHorus, Montf. 
1. CycLopHoRUS BORNEENSIS, Metcalfe. 
Cyclostoma borneensis, Metcalfe, P. Z.S. 1851, p. 71; Mart. u. 
Chem. Conch.-Cab. ed. ii. p. 362, pl. xlvii. figs. 1-3 ; Reeve, Conch. 
Icon. pl. xii. fig. 50 (1861); von Martens, Preuss. Exped. Ost-Asien, 
Die Landschnecken, p. 136, pl. iii. figs. 5, 6 (1867). 
Cyclostoma subinvolvulus, Kydoux et Souleyet, Voy. Bonite, Zool. 
ii. p. 534, pl. xxx. figs. 22-24. 
Hab. Niah Hills, Trusan, Labuan (A. Zverett). 
2. CYCLOPHORUS NIAHENSIS, n. sp. (Plate XXXV. figs. 1, la, 
15.) 
Shell dextral, depressedly turbinate, widely umbilicated, subangu- 
late ; sculpture, the 24 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. 
po aa tenebricosus, Adams and Reeve, Zool. Voy. Samarang, 
Moll. p- 57, pl. xiv. fig. 6 (1850) ; Mart. u. Chem. Conch.-Cab. ed. ti. 
p- 250, pl. xxxiii. figs. 12, 13. 
Leptopoma tenebricosum, Reeve, Conch. Icon. pl. vii. fig. 44 (1862). 
14" 4. CYCLOPHORUS COCHRANEI, n. Sp. 
Shell turbinate, solid, keeled, narrowly umbilicated, the umbilicus 
very nearly concealed by the columellar margin ; sculpture a smooth 
