9 6 



Pristigaster tartoor Cuvier & Valenciennes, Hist. Nat. Poissons XX. 1847, p. 328. 

 Pristigaster tartoor Bleeker, Verb. Bat. Gen. XXIV. 1852, Haringacht., p. 25, 



(ex parte). 



Opisthopterus tartoor Bleeker, Ned. Tijdschr. Dierk. III. 1866, p. 296. 

 Pristigaster tartoor Gunther, Cat. Brit. Mus. VII. 1868, p. 460. 

 Opisthoplerus tartoor Bleeker, All. Ichth. VI. livr. 25, 26. 1872, p. 123. 

 Opisthopterus tartoor Day, Fishes of India 4. 1878 1888, p. 646. 



B. 6; D. 1517; A. 5666; P. 1416; L.I. 5054; 

 L. tr. 12 13. 



Elongate, very compressed, very convex from chin to anal. 

 Dorsal profile of head concave, of back slightly convex. 

 Height 3 ! / 3 3 3 / 4 , head about 5, eye 2 3 / 4 3, much longer 

 than snout and shorter than postorbital part of head. Maxil- 

 lary twice in head, its supplementary bone reaches nearly as 

 far as the maxillary itself, the ventral border of which is 

 denticulated. Operculum rounded behind, praeoperculum trian- 

 gular. Distance of the origin of the caudal to the end of the 

 snout is i 3 / 4 times its distance from the snout. The origin of 

 the dorsal lies more than twice the length of the dorsal 

 behind the vertical through the origin of the anal. Pectorals 

 somewhat shorter than head. Scales deciduous, 28 30 sharp 

 keeled and curved abdominal scutes. Teeth on the jaws, 

 palatines, pterygoids and tongue. Gillrakers 28, stout, spinulous 

 all round, twice as long as the branchial filaments,- as long 

 as pupil. Silvery, except on the back, a dark patch behind 

 upper angle of operculum. Fins hyaline. Caudal with a dusky 

 margin. Length over 200 mm. 



Nomen indig: Kentut (Batavia). 



Habitat: Java (Batavia!; Palabuan Batu) ; Sumatra (Bagan 

 Api Api!). British India. 



In sea. 



2. Opisthopterus macrognathus Blkr. 



Pristigaster tartoor Bleeker, Verb. Bat. Gen. XXIV. Haringacht., p. 25 (ex parte). 

 Opisthopterus macrognathus Bleeker, Ned. Tijdschr. Dierk. III. 1866, p. 299. 

 Pristigaster macrognathus Gunther, Cat. Brit. Mus. VII. 1868. p. 461. 

 Opisthopterus macrognathus Bleeker, Atl. Ichth. VI. livr. 25, 26. 1872, p. 124. 



B. 6; D. 1617; A. 5963; P. 13; L.I. 455 2 ; L.tr. 1213. 



Elongate, very compressed, very convex from chin to anal. 

 Dorsal profile of head concave, back convex. Height 3 ! / 4 3 ! / 2 > 

 head about 5, eye about 3, '/ 4 longer than snout, less than 



