284 



each palatine bone; the palatine patches divergent behind. 

 Bluish green above, margaritaceous or silvery below. Fins 

 yellowish, more or less dusky. Length of the two known 

 specimens 100 and 113 mm. [After Bleeker and Gunther, not 

 seen by us]. 



Habitat: Sumatra (Priaman, Trussan, Benkulen). 



In sea and estuaries. 



7. Arius maculatus (Thunb.) ! ). 



Silurus maculatus Thunberg, Kongl. Vetensk. Acad. Nya Handling. XIII. Stock- 

 holm, 1792, p. 31. 



Arius gagoroides Bleeker, Nat. & Geneesk. Arch. Ned. Ind. Ill (2). 1846, p. 168. 



Arius Heckelii Bleeker, Nat. & Geneesk. Arch. Ned. Ind. Ill (2). 1846, p. 169. 



Arius pidada Bleeker, Nat. & Geneesk. Arch. Ned. Ind. Ill (2). 1846, p. 169. 



Arius angulatus Bleeker, Nat. & Geneesk. Arch. Ned. Ind. Ill (2). 1846, p. 170. 



Arius chondropterygioides Bleeker, Nat. & Geneesk. Arch. Ned. Ind. Ill (2). 

 1846, p. 170. 



Arius viviparus Bleeker, Nat. & Geneesk. Arch. Ned. Ind. Ill (2). 1846, p. 171. 



Arius borneensis Bleeker, Nat. Tijdschr. Ned. Ind. II. 1851, p. 67. 



Arius arius Bleeker, Ichth. Arch. Ind. Prodr. I. Siluri, 1858. p. 73. 



Arius pidada Bleeker, Ichth. Arch. Ind. Prodr. I. Siluri, 1858, p. 74. 



Pseudarius arius Bleeker, Atl. Ichth. II. 1862, p. 36. 



Arius maculatus Gunther, Cat. Brit. Mus. V. 1864, p. 166. 



Arius maculatus Kner, Novara-Exp. Fische, 1865 1867, p. 311. 



B. 5; D. i. 7; A. 1922; P. i. io n; V. 6. 



Elongate, height 4 5, head 3 2 / 3 4, somewhat broader than 

 high, its width at least equal to head without snout. Head- 

 shields granular and rugose, occipital process carinate, granulated, 

 scarcely longer than broad and more or less triangular, the 

 truncate hindborder touches the semicircular granulate basal 

 bone of the dorsal spine. Median fontanel rather broad, be- 

 ginning at the snout, narrowing behind and ending before 

 occipital process. Humeral process triangular, granulated. Dorsal 

 profile sloping down in a straight or slightly convex line to 

 the bluntly rounded, slightly prominent snout. Eye sV 2 (in 

 spec, of 330 mm.) with a free orbital margin, more than half 

 length of snout and more than twice in the interorbital space. 

 Maxillary barbels reaching on pectorals, in older specimens 



i) We have no material to decide the question if Pimclodus arius H. B., 

 Arius arius C. V. and Arius Buchanani Day from the Asiatic continent, belong 

 to this species. 



