JONES & PRESTON : ON CHINESE AND BORNEAN JllOLLUSCA. 145 



56. Telescopiijm fxjscum, Schum. 



Sebatik Island, Dutch Borneo. Very commonly to be found on the 

 edges of the mangrove swamps, buried in the sand or mud. 



57. Cerithidea rhizoporarum, a. Ad. 



At Hong Kong. More plentiful than the preceding, but like it in 

 habitat and behaviour. 



58. Planaxis sulcatus (Born). 



Not uncommon at Crooked Island, off the mainland, adjoining 

 Hong Kong. 



59. Melania. 



Two species of Melania were obtained in Borneo — one at Lahad 

 Datu, Darvel Bay, which lived in fresh water, and was not very 

 common, and one which lived in the salt water of a mangrove 

 swamp, at Labuan, in great profusion. The first was M. episcopalis. 

 Lea, and the second M. Lahuanensis, Brot. The neighbourhood of 

 Hong Kong produced two species, of which one, M. Hainanensis, 

 Brot, was only discovered in two localities, many miles apart, but 

 plentifully in both places. The habitat of this species appeared 

 to be clear, rapidly running, rocky streams. The other species, 

 M. costeUaris, Lea, was obtained from the stagnant water of the 

 paddy-fields, and was very much restricted in its distribution. 



60. LiTTORiNA (Melaraphe) melanostoma. Gray. 



A common species, both in British iJiorth Borneo and in the 

 neighbourhood of Hong Kong. 



61. LiTTORiNA carinifera, Menke. 



Taken commonly at Pakerang in British North Borneo and in 

 Labuan. 



62. LiTTORiNA tjndulata. Gray. 



Found abundantly with the last-named species. 



63. LiTTORiNA scABRA (Linn.). 



Found in moderate numbers at Shawei Shan Island, where, during 

 the ebb tide, it must have lived in perfectly fresh water. 



64. LiTTORiNA ARBORICOLA, Rve. 



Not uncommon at Labuan. 



65. LiTTORiNA BREVICULA, Phil. 



The species occurred abundantly at Shawei Shan Island, where, 

 like Littorina scahra, it passes half its life in fresh and half in 

 salt water. 



66. ToRiNiA perspectiviunculus (Chemnitz). 



A few specimens were obtained in British North Borneo. 



VOL. VI. — SEPTEMBER, 1904. 11 



