229 
as or a little longer than first dorsal and reaching to ventrals. 
Pectoral spine shorter than the dorsal one. Teeth in the 
maxillary band in about 4, in the mandibulary band in about 
5 rows, for the greater part molariform, as also those of the 
vomer, which form a crescentic patch. 26—28 gillrakers on 
the total first branchial arch, the 4 foremost ones are short. 
Black, a superior longitudinal white band, beginning opposite 
first dorsal and narrowing to end of tail, where it gets 
indistinct. A similar inferior band originating in young ones 
in the white colour of the abdomen. In large specimens the 
white abdomen gets dark. Barbels more or less white. Fins 
black. Length to 550 mm. 
Habitat: Lorentz-river, South New Guinea! 
3. Plotosus abbreviatus Boul. 
Plotosus abbreviatus Boulenger, Ann. Mag. Hist. (6) XV. 1895, p. 247. 
ieee ia A. 2. De OO ie Os Ps, T. 125 Ve Ids CL 18. 
Elongate. Height 8, head 4, 1'/, times as long as broad, 
its depth */, its width, eye 11, 4 times in interorbital space. 
Nasal barbel nearly 1'/, in length of head, extending to prae- 
operculum. Maxillary barbel to opercle. Pectoral spine a little 
longer than dorsal, ?/,; of length of head. Maxillary band of 
conical teeth thrice as broad as long, in 3—4 rows, the 
anterior of which are by far the largest. Vomerine teeth large, 
molarlike in a large crescentic patch. Broad band of about 
4 rows of molarlike mandibular teeth, with an outer series 
of large obtusely conical ones. Uniform dark olive above 
whitish beneath. Length 420 mm. [Type in the British Museum 
examined]. 
Habitat: A single, specimen from the mouth of the 
Baram-river, Borneo. 
4. Plotosus anguillaris (Bl.). 
Platystacus anguillaris Bloch, Auslind. Fische VIII. 1794, p. 61. 
Plotosius tkapor Lesson, Voyage Coquille, Zoologie II. 1830, p. 132. 
Plotosus marginatus Bennett, in Life of Raffles, Cat. Zool. spec. 1830, p. 691. 
Plotosus lineatus Cuvier & Valenciennes, Hist. Nat. Poiss. XV. 1840, p. 412. 
Plotosus anguillaris Cantor, Journ. Asiatic Soc. Bengal, XVIII. 1850, p. 1246. 
Plotosus castaneoides Bleeker, Nat. Tijdschr. Ned. Indié, II. 1851, p. 490. 
Plotosus arab Bleeker, Atl. Ichth. IH. 1862, p. 98. 
