64 SILURIDJE. 



the pectoral has a very large opening, divided by reticulated cross- 

 bars into smaller foramina. 



Borneo. 

 a. Type of the species. From Dr. P. v. Bleeker's Collection. 



. Pangasius juaro. 



Pangasius polyuranodon, Bleek. Nat. Tyclschr. Nederl. Ind. iii. p. 425. 

 and Prodr. Silur. p. 186. 



juaro, Bleek. Nat. Tydschr. Nederl. Ind. iii. p. 589. 



Pseudopangasius polyuranodon, Bleek. All. Ichth. Silur. p. 76. tab. 78. 



B. 7-9. D. 1/7. A. 35-39. P. 1/12-13. 



Snout rounded, obtuse. The maxillary barbels extend somewhat 

 beyond the head, those of the mandible being as long as the eye. 

 Vomerine teeth in a quadrangular patch, which is but little broader 

 than long, and separate from the oblong palatine patches. The soft 

 dorsal is lower than the body ; its spine is of moderate strength, 

 serrated behind, and rather shorter than the head ; pectorals nearly 

 as long as the head. 



Sumatra and Borneo. 



a. Type of the species. From Dr. P. v. Bleeker's Collection. 



24. HELICOPHAGUS. 



Helicophagus, Bleek. Act. Soc. Sc. Indo-Neerl. iii., Sumatra, vi. p. 49. 



Adipose fin very small ; a short dorsal fin with a pungent spine 

 and with seven soft rays ; anal fin elongate, with about thirty rays. 

 Barbels slender, four : one at each maxillary, and two behind the 

 symphysis of the mandibles. Teeth on the palate villiform, in two 

 small separate patches, if present. The upper jaw is the longer. 

 Eyes with a free orbital margin. Nostrils on the upper side of the 

 snout, the posterior being more remote from each other than the an- 

 terior. Caudal forked ; ventral rays six. 



East Indian Archipelago. 



1. Helicophagus typus. 



BleeP.er, Act. Soc. Sc. Indo-Neerl. iii., Sumatra, vi. p. 46 ; Prodr. Silur. 

 p. 176 : and Atl. Ichth. Silur. p. 78. tab. 79. fig. 2. 



B. 9. D. 1/7. A. 29. P. 1/13. 



The humeral process is pointed behind ; the maxillary barbels ex- 

 tend to the hind part of the pectoral, those of the mandible to the 

 opercles. Vomerine teeth minute, in two extremely small patches, 

 if present. Dorsal spine strong, serrated , three-quarters of the length 

 of the head ■ pectoral spine strong, scarcely longer than that of the 

 dorsal fin. 



Sumatra. 



a Type of the species. From. Dr. P. v. Bleeker's Collection. 



