yS^^ \ VJIlN J NATURAL SCIENCES OF PHILADELPHIA. 169 



*^ " Subfamily AULOSTOMIN^ Gill. 



Aplostoma Lac. 



PoLTPTERiCHTHYS Bleeker. 



Polypterichthys Bleeker, Natuurkundig Tijdsclirift voor Nederlandsch Indie, 

 vol. iv. p. 608. 



Subfamily AULORHYNCHIN^ Gill. 



AULORHTNCHUS Gill. 



Subfamily SIPHONOSTOMIN^ Gill. 



SiPHONOSTOMUS (Klein) Gron. 

 Fistularia Linn. 

 Channorhynchus Cantor. 



Genus Aulorhynchus Gill. 



Body moderately elongated and almost cylindrical. Tail from the dorsal 

 and anal fins elongated conical and slightly depressed, merging into the very 

 slender and depressed caudal peduncle. Skin naked. Lateral line marked by 

 a continuous row of short canals. Head with the skin naked. Mouth small, 

 horizontal, and at the end of a flexible tube about as long as the rest of the 

 head. Intermaxillary bones much expanded, and with long and slender pos- 

 terior processes. Teeth on the supramaxillary and dentary bones nearly uni- 

 serial. Palate edentulous. Nostril with raised margin, rather distant from 

 front of eye. Branchiostegal rays 4 — 4. Dorsal spines numerous, equal and 

 very short, commencing above the pectorals. Dorsal and anal fins posterior, 

 nearly equal, oblong, and elevated in front. Caudal fin small and emarginated. 

 Pectoral fins also emarginated, the superior and inferior rays being longest. 

 Ventral fins inserted not far behind the bases of the pectoral ; each with a 

 slender spine and five branched rays. 



AULOKHTNCHUS FLAVIDUS Gill. 



Tawny, minutely punctulated with black above and on the sides, immacu- 

 late beneath. Snout with a lateral yellowish line. Operculum and suboper- 

 culum with a golden lustre : the former also punctulated above. Ante-pecto- 

 ral or humeral region lustrous golden, bordered above by a blackish band 

 parallel with the superior pectoral ravs. 



D. spines xxvi. D. 10. A. I. 10. P. 1, 18, 1. V. I. 5. 

 The proportions, in hundredths, are as follows : 



Total length, 5 inches 100 



Body — Height of body a 6 



" behind dorsal 4^ 



Width behind dorsal 4^ 



Head — Length of head •25 



Distance between snout and preoperculum... '18 



" " " orbit -12 



" " orbits 3 



Height of head 5 J 



Greatest width of head 4^ 



Diameter of eye 4 



Dorsal — Distance of dorsal fin from snout '49 



Length of dorsal fin 9 



Greatest height 7 



1861.] \ 



