FISHES OF THE PHILIPPINE ISLANDS AND ADJACENT SEAS 547 



Depth 334 to 3% ; head without opercular flap 5 to 5%. Eye 414 

 to 5 in head, equals snout or slightly longer; maxillary reaches hind 

 pupil or eye edge, according to age, 21^ to 2i^ in head; 2 ventral 

 ridges of mandible and preopercle serrated, also lower border of sub- 

 orbitals. Gill rakers 8, % of eye, 1/3 shorter than gill filaments. 



Scales about 65 transversely at anal origin ; 8 to 10 transverse rows 

 on preopercle; much larger on opercles than on body. Double series 

 of 26 to 33 spines along abdomen. 



D. 8 or 9, origin midway between snout and end of caudal, high 

 as postorbital part of head; A. 100 to 110; pectoral long as head with- 

 out snout, rays 15 to 17; ventral 5. 



More or less grayish silvery, back darker. Anal and caudal often 

 margined with blackish. Length, 350 mm. (Weber and Beaufort.) 



India, Burma, Siam, Java, Sumatra. 



Family DOROSOMIDAE 



Body short, deep, well compressed. Belly compressed to edge 

 armed with bony serrae. Head short, rather small. Eyes with adi- 

 pose lids. Mouth small, inferior, oblique, overlaps blunt snout. No 

 teeth. Mandible short, deep, rami enlarged basally. Premaxillaries 

 not protractile. Gill membranes not united, free from isthmus. 

 Pseudobranchiae large. Branchiostegals 6. Stomach short, muscu- 

 lar, like gizzard of fowl. Scales thin, deciduous, cycloid. Head 

 naked. No lateral line. Dorsal median, usually behind ventrals 

 and last ray often prolonged in filament. Anal very long, low. 

 Caudal forked. 



Mud-eating fishes of the coasts and rivers of warm regions, many 

 in fresh water. They are usually little valued as food. The gizzard- 

 like stomach seems to be the outstanding character of distinction for 

 the family. 



ANALYSIS OF GENERA 



a}. Dentary edge reflected outward in front of maxillary end ; mouth toothless, 

 subterminal or inferior, transverse, its cleft forming angle. 

 6^. Last dorsal ray not prolonged in filament. 

 c*. Maxillary slender, terminally slightly expanded and curved downwards. 



Gonialosa 

 c'. Maxillary straight, thin, transversely expanded plate, tapering terminally. 



Anodontostom^a 



b^ Last dorsal ray prolonged in filament Nematalosa 



c*. Dentary edge not reflected outward in front of maxillary ; mouth terminal or 

 subterminal ; last dorsal ray prolonged in filament Clupanodon 



Genus GONIALOSA Regan 



Oonialosa Regan, Ann. Mag. Nat. Hist., ser. 8, vol. 19, p. 315, 1917. (Type, 

 Chatoessus modestus Day, designated by Jordan, Genera of fishes, pt. 4, 

 p. 560, 1920.) 



