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 Kiua 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- 

 maceae, the second will include the Helicacea (amongst which are 

 a number of very fine new species) and the freshwater and brackish 

 water forms. 



Cyclophortjs, Montf. 

 /S. -jf f ■ ' 1. Cyclophorus borneensis, Metcalfe. 



Cydostoma borneensis, Metcalfe, P. Z. S. 1851, p. 71 ; .Mart. u. 

 Chem. Conch.-Cah. 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). 



Cyclostotna subinvolvulus, Eydoux et Souleyet, Voy. Bonite, Zool. 

 ii. p. 534, pi. XXX. figs. 22-24. 



Hab. Niah Hills, Trusan, Labuan {A. Everett) . 



/> f^ 1 2. Cyclophorus niahensis, n. sp. (Plate XXXV. figs. 1, la, 



lb.) 



Shell dextral, depressedly turbinate, widely umbilicated, subangu- 

 late ; sculpture, the 2i 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. 



/,' i^ 3. Cyclophorus tenebricosus, Adams & Reeve. 



Cydostoma tenebricosus, Adams and Reeve, Zool. Voy. Samarang, 

 Moll. p. 57, pl.xiv. fig. 6 (18.i0) ; Mart. u. Chem. Conch. -Cab. ed.ii. 

 p. 2.")0, pi. xxxiii. figs. 12, 13. 



Leptopoma tenebricosum. Reeve, Conch. Icon. pi. vii. fig. 44 (1862). 



», n ^'^ 4. Cyclophorus cochranei, n. sp. 



Shell turbinate, solid, keeled, narrowly umbilicated, the umbilicus 

 very nearly concealed by the columellar margin ; sculpture a smooth 



