56 ZOOLOGY OP THE VOYAGE OP H.M.S. SAMARANG. 



48. SCARABUS, Be Montford. 



1. Scakabus teigonus. PL XIV. Pig. 12. Troscheh Eeeve Conch. Syst, vol. ii. pi. 183. f. 2. Head 

 and lower part of the tentacles blackish-brown, rest of the animal pale brown, whitish towards the end of 

 the foot. The tentacles are annulated, with a swelling at the base, on the inner side of which are the sessile 

 black eyes surrounded by a light areola ; the tentacles are comparatively long and cylindrical in this species. 



Hab. Borneo, under dead leaves. 



2. Scarabus imbiutjm. PI. XIV. Pig. 13. De Montford, Conch. Syst. The animal of this species 

 varies in colour according to the shell : when the latter is dark, the animal has a blackish head and neck, 

 growing gradually paler towards the hind part of the foot ; the animals of the light-coloured shells are of a 

 uniform pale brown. 



Hab. Celebes and Borneo, under dead leaves and decayed vegetable matter in the forests near the 

 sea-coast. 



3. Scakabus Cumingianus. PI. XIV. Pig. 16. Petit, Pro. Zool. Soc. 1843, p. 3. Animal of a light 

 chestnut-brown, the muzzle rather produced, the tentacles subulate and annulated, with the eyes sessile at 

 their inner bases, surrounded by a light-coloured areola. 



Hab. Koo-Kien-San, one of the Meiacoshima group of islands, near Formosa, in the Blue Sea. 



12. CYCLOSTOMACEA. 



The subgeneric types of this extensive and interesting group vary also in their habits, 

 for while Zeptopoma invariably lives among the foliage of the trees, Cyclopliorus inhabits the 

 decayed vegetable matter at their roots. Pterocyclos is found in moss among loose stones. 

 Nematura and many of the Cyclostoma proper are semi-aquatic ; the former inhabiting ponds, 

 attached to the under surface of floating leaves, and the latter being found among loose 

 stones near the sea-shore. 



49. CYCLOSTOMA, Lamarck. 



1. Cyclostoma splracelluji. PI. XIV. Pig. 1. Cyclost. testa suborbiculari, planorbula, spira depressa, 

 pallida, anfractibus quatuor, rotundatis, transversim striatis, sutura distincta, ultimo dorso inflato, demum 

 coarctato et quasi strangulate, varice fornicato prope aperturam, apertura circulari, peritremate duplici, 

 interne postice emarginato, externe reflexo, postice in canalem desinente, anfractu ultimo spiraculum tubu- 

 losum prope aperturam gerente, umbilico patulo, anfractibus intus conspicuis. Operculo circulari, spirali, 

 intus corneo, concavo, extus testaceo, margine sulcato. 



Hab. Borneo, under decayed vegetable matter in the forests. 



A small species, largely umbilicated, belonging to the division Pterocyclos. 



