254 nCHMA, ITS PEOPLE A XI) PRODUCTIOXS. 



Top of the lioad liiicatcd iu rougliuiiud lines. The maxillary barbels rcacli to the 

 first third of the pectoral tin, the outer mandibular ones almost to its base. Palatal 

 teeth with large globular heads. Silvery above, lighter below. Pectoral and dorsal 

 edged with blackish behind. A black spot on the adipose dorsal. 



The Irrawaddy l{i\er. 



A. GAGOKA, Ham. Buch. 



B. vi. ; D. iO; P. -A,-; V. 6; A. 18; C. 17. 



Upper jaw the longer. Most of the occiput and the whole of the occipital process 

 granulated. Median groove on the head naiTow and deep. The maxillary barbels 

 less than the head ; the outer mantlibular ones reach to the gill opening. Palatal 

 teeth globular, in large semi-ovate patches. Pui^plish above, whitish below. Aii'-vessel 

 five-chambered. Grows to 1| feet or more (3 feet, Jide H. B.). 



Burma. 



A. JA'rrus, Ham. Buch. 

 !Nga-young or Nga-yeh. 



B. vi. ; D. i-0; P. tV ; V. 6; A. 18; C. 17. 



Summit of head sparingly granulated behind. The maxillaiy barbels shorter 

 than the head ; the outer mandibular ones just reach the gill-opening. Palatal 

 teeth on a small patch, which may be absent. Dorsal spine strong, serrated on both 

 sides. Dark bluish above, paler below. Fins yellowish. Upper edge of dorsal deep 

 black. A deep black spot on the upper half of the adipose dorsal. Caudal black- 

 edged. An;d with a dark marginal spot. Grows to a loot or more. 



Burma, ascending tidal rivers. 



Bateachocephalus, Sleeker. , 



Lower jaw the longer. Eyelids with a free circular margin. Nostrils approxi- 

 mate, the posterior valvular. Barbels two, rudimentary on the chin. Teeth obtusely 

 conical in two distant rows in either jaw, and a longitudinal band on the palate. 

 None on the vomer. An axillary pore. 



B. Mixo, Ham. Buch. 



B. V. ; D. 1-0 ; P. i ; V. 6 ; A. 20 ; C. 15. 



Colour silvery, darkest along the back and upper lobe of caudal fin. 



The Irrawaddy lliver. 



This fish is not common and is held in no esteem for food. 



Ketengus, Bleelcer. 



Head bony above. Eyelids with a free circular margin. Upper jaw longest. 

 Barbels 6, small, no nasal ones. Nostrils approximate, the posterior valvular. 

 A single row of compressed teeth, palate edentulous. An axillary pore. 



K. Tipus, Bleeker. 



B. V. ; D. 1-0 ; P. T^i ; V. 6 ; A. 1920 ; C. 15. 



Colour silvery. 

 The Andamans. 



OsTEOGENiosus, BleelceT. 



A thin skin over the head. Upper jaw the longer. Nostiils appoximate, the 

 posterior valvular. A single pair of semi-osseous maxillary ones. Teeth on the jaws 

 villiform, on the palate obtusely conical. An axilhuy pore. 



0. MILITAEIS, L. 



B. v.; D. \-Q; P. tu-St-; V. 6 ; A. 19 22; C. 17. 



Barbels rather longer than the head. Silvery, darker above, i'ius tinged with 

 red. Grows to 14 inches or more. 

 Burma, entering rivers. 



