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ZOOLOGY OF THE FAR EAST. 
Family PORTUNIDAE. 
Subfamily PORTUNINAE. 
Genus Scylla, de Haan. 
Scylla serrata (Forskdl), de Haan. 
1899. Scylla serrata, Alcock, Journ. Asiat. Soc. Bengal, LXVIII, p. 27. 
This species is the common edible crab of the Malay Peninsula. Dr. Annandale 
found it abundant in the outer part of the Tale Sap and young specimens were ob- 
served in ditches of brackish water and in mangrove swamps. 
Genus Neptunus, de Haan. 
Neptunus pelagicus (Linn.). 
1899. Neptunus pelagicus, Alcock, Journ. Asiat. Soc. Bengal, lyXVIII, p. 34. 
Very abundant in the outer part of the Tale Sap. Young specimens were taken 
in the channel opposite Singgora and round Koh Yaw in from 3 to metres, usually 
among dead shells. 
Genus Charybdis, de Haan. 
Charybdis crucifera (A. Milne-Edwards). 
1899. Charybdis (Goniosoma) crucifera, Alcock, Journ. Asiat. Soc. Bengal, LXVIII, p. 51. 
Common at Singgora. Many dead specimens were seen at the edge of the lake. 
Charybdis aftinis, Dana. 
1899. Charybdis {Goniosoma) affinis, Alcock, Journ. Asiat. Soc. Bengal, LXVIII, p. 56. 
Two large specimens, with carapace 67 mm. and 51 mm. in breadth, are in the 
collection. They are considerably larger than any other examples in the Museum and 
differ from Alcock' s description in the almost complete absence of the transverse ridge 
on the cardiac region of the carapace. This character, which is used by Alcock in 
his key to the Indian species of the genus, is evidently not valid in the case of very 
large specimens. 
The specimens were taken in fishing nets at Singgora. 
Charybdis callianassa (Herbst), A. Milne-Edwards. 
1899. Charybdis {Goniosoma) callianassa, Alcock, Journ. Asiat. Soc. Bengal, LXVIII, p. 57. 
Found with the preceding at Singgora. 
Tribe OXYSTOMATA. 
Family LEUCOSHDAE. 
Subfamily LEUCOSJINAE. 
Genus Ebalia, Leach. 
Ebalia heterochalaza, sp. nov. 
The carapace is .sharply polygonal in outline and is broader than long in the pro- 
portion of 14 to 13. The lateral and posterior margins are coarsely granulate and 
