22 9 



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. 

 I. D. I. 4; 2 D. 90; A. 82; P. I. 12; V. 14; C. l8. 



Elongate. Height 8, head 4, i ! / 2 times as long as broad, 

 its depth 3 / 3 its width, eye n, 4 times in interorbital space. 

 Nasal barbel nearly i 1 ^ in length of head, extending to prae- 

 operculum. Maxillary barbel to opercle. Pectoral spine a little 

 longer than dorsal, 2 / 5 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, Ausland. Fische VIII. 1794, p. 61. 

 Plotositts. ikapor Lesson, Voyage Coquille, Zoologie II. 1830, p. 132. 

 Plotostis marginal us Bennett, in Life of Raffles, Cat. Zool. spec. 1830, p. 691. 

 Plotosus lincatus Cuvier & Valenciennes, Hist. Nat. Poiss. XV. 1840, p. 412. 

 Plotosus anguillaris Cantor, Journ. Asiatic Soc. Bengal, XVIII. 1850, p. 1246. 

 Plotostis castaneoides Bleeker, Nat. Tijdschr. Ned. Indie, II. 1851, p. 490. 

 Plotosus arab Bleeker, Atl. lehth. II. 1862, p. 98. 



