OCR Text |
Show 1881.] SUMATRA AND BORNEO. 631 13. V I T R I N A H Y A L E A , sp. nov. (Plate LV. fig. 6.) Shell depressedly globose, subauriform, olive-brown, glossy, sculptured with very fine lines of growth and microscopic spiral striae. 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, membranous. 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. CYCLOPHORUS PLANORBULUS, Lam. In the dense forests at Sidjoendjoeng, 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 leaves 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 place of resort. W e succeeded in finding two or three perfectliving 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. |