252 



above the corner of the mouth, the mandibulary barbels 

 behind the syrnphysis. Dorsal well developped, with 6 7 

 soft rays and a strong flattened denticulated spine, which is 

 preceeded by a broad but very low rudimentary spine. Adipose 

 fin small. Anal fin elongate with 30 or more rays, distant 

 from caudal, ventrals well developped with 6 rays, pectorals 

 with a strong flattened denticulated spine. Caudal forked. 

 Teeth in the jaws in a broad band or in the upper jaw in 

 two separate patches, the vomerine teeth in two separate 

 bands or patches. 9 branchiostegal rays; no teeth on the 

 palatine. Gillmembranes united anteriorly, free from isthmus. 



Fig. 1 02. Helicophagus waandersi Blkr. 



Synopsis of the species. 



I. Anal 30, more than thrice in length. Teeth in the 



upper jaw in a broad curved band H. typus p. 252. 



II. Anal 37 or more, 2 3 / 4 in length. Teeth in the upper 



jaw in two nearly quadratic patches H. waandersi p. 253. 



i. Helicophagus typus Blkr. 



Helicophagus typus Bleeker, Act. Soc. Sci. Indo-Neerl. III. 1858, p. 46. 

 Helicophagus typus Bleeker, Atl. Ichth. II. 1862, p. 78. 

 Helicophagtts typus Giinther, Cat. Brit. Mus. V. 1864, p. 64. 



B. 9; D. II. 67; A. 2930; P. i. 1113; V. 6. 



Elongate, slightly compressed, head conical, profile behind 

 dorsal nearly straight, before dorsal sloping down in a straight 

 line to the prominent snout. Height behind dorsal about 5, 

 head 4 3 / 4 . Mouth subterminal. Anterior nostrils pierced through 

 the frontborder of the snout and looking forward, posterior 

 nostrils more distant from each other, halfway between the 

 anterior ones and the eye. Maxillary barbels extending nearly 

 to the pectoral spine, mandibulary barbels about Y 3 longer. 



