1881.] SUMATRA AND BORNKO. 031 



13. ViTRiNA HYALEA, sp. iiov. (Plate LV. fig. 6.) 



Shell depressedly globose, subauriform, olive-brown, glossy, sculp- 

 tured with very fine lines of growth and microscopic spiral strise. 

 Spire small, pale, hardly raised above the last whorl. Volutions 2 

 to 3, depressedly margined at the suture, last very large. Aperture 

 very large, subhorizontal or only a little oblique, lunar-rounded. 

 Outer lip, seen from above, feebly incurved near the suture, the 

 somewhat excurved columellar margin of the peristome thin, mem- 

 branous. Greatest diameter 20 millim. 



Hab. Ajer Angat, near Korinthji. 



This species is darker in colour than most others of this genus, 

 but somewhat lighter than the Tasmanian V. milligani. 



14. Clausilia sumatrana, v. Martens. 



Hab. Common in the coffee-plantations at Paio, Sumatra. 



15. PUPINA SUPERBA, Pfr. 



I collected three specimens at Paio. 



16. Cyclophortjs planorbulus, Lam. 



In the dense forests at Sidjoendjoeug, with the aid of some natives, 

 I secured some fifty specimens, all living, and with opercula ; but 

 the species is rare, and requires a close search amongst the decayed 

 leaA'es and in the damp soil ; it varies considerably in size. 



17. Cyclophorus ExiMius, Mousson. 



Of this glorious shell, the pride of the Sumatra forests, I succeeded 

 in collecting some sixty specimens at Sidjoendjoeng. I first found 

 dead shells in the immense forests there pretty common ; and being 

 determined to exhaust the place of live ones, as much as possible, of 

 this fine species, I set some natives to work every day to pull down 

 the decayed trees that were filled with earthy matter, and also to 

 look amongst the masses of dead leaves on the ground ; but the 

 former seemed to be their favourite jjlace of resort. We succeeded 

 in finding two or three perfect living specimens every day ; but when 

 I looked over all that had been collected, over 50 per cent, were dead 

 white specimens with hardly any colour at all ; 30 per cent, were shells 

 in various stages of growth, but without a lip, and in most cases 

 the last whorl near the mouth was broken and rounded ; 20 per cent, 

 is left for fine full-grown examples possessing the bronzy shining 

 epidermis. 



Hab. Mount Sago and Sidjoendjoeng. 



The Dutch Sumatran Expedition found 11 specimens, all dead ; 

 but it is interesting to note the localities, all being places with 

 immense forest vegetation : — 1 spec, near Silagoi ; 1 spec. Soengei 

 Aboe ; 2 spec, near Moeara Labol ; 1, Mount Korinthji, at a height 

 of 1000 metres; 4 spec. Loeboe Gedang ; 2 spec. Ajer Boesock. 



