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and slightly rising to broad interorbital space. 

 Operculum swollen with a low somewhat 

 convex longitudinal keel and dorsally and 

 ventrally radiating lines. Caudal very small 

 or rudimentary; base of dorsal not or only 

 slightly elevated. Brown with lighter or 

 darker marblings; trunk ventrally .with faint 

 transverse bands, lower surface of tail with 

 irregular transverse margaritaceous spots. 

 Snout and under side of head with large 

 black spots. Length about 300 mm. [Speci- 

 men of 5. bicoarctatus Blkr. of BLEEKER'S 

 collection in the Leiden Museum seen by us]. 

 Habitat: Singapore; Sumatra; Am- 

 oon. East Africa, Mauritius, Cargados 



Carajos Islands, China, Japan. 



19. Haltcampus Kaup. 



(KAUP, Cat. Lophobr. Fish, 1856, p. 22). 



Elongate, rather stout, trunk heptagonal; 

 tail tetragonal, about twice longer, than trunk. 

 Shields with the edges prominent, entire, 

 incompletely divided in two or dentated 

 or serrated and partly spinous, furnished 

 with arborescent cutaneous appendages ; 

 intermedial shields (scutella), a praenuchal 

 and a nuchal shield present. Head with 

 prominent eyes. Snout slender, more or less 

 depressed, with rows of small spines, shorter 

 or much longer than remaining part of head, 

 and abruptely ascending to the forehead, 

 which is still more elevated by the spinous 

 orbital ridges. Operculum with a longitudinal 

 convex keel, directed upwards, whereof 

 radiate numerous striae. Occiput and neck 

 elevated into a crest. Superior and inferior 

 cristae of trunk and tail discontinuous; 

 median cristae of trunk and inferior cristae 

 of tail continuous. All the fins present. Dorsal 

 situated above 4 or 5 rings; its base ele- 



