BY TV. MACXEAY, F.L.S. 215 



are both broader and longer, upper lobe of tail longest. Barbels 

 six. (Richards.) 



North-west Coast of Australia. 



823. Aritjs vertagus, Eichards. 



Voy. Ereb. and Terr., Fish., p. 33.— Gunth., Cat. Fishes V., p. 174. 



B. 6. D. 1/6-7. A. 28. P. 1/9. V. 9?. 



The dorsal spine is equal in length to the space between its 

 base and the orbit, and is shorter than the pectoral spine, which 

 is strongly serrated on both sides. Head granulated above, with 

 the occipital process crescentic at the apex. The vomerine teeth 

 are disposed in two small separate plates, and the palatine teeth 

 form a still smaller plate near each corner of the mouth. Barbels 

 six. Length three inches. 



North-west Coast of Australia. 



The last two species were described by Sir John Richardson 

 from very imperfect specimens. 



Family II. HAPLOCHITONIM]. 



Body naked or scaly. Margin of the upper jaw formed by the 

 intermaxillary ; opercular apparatus complete. Barbels none. 

 Gill-opening wide ; pseudobranchise well developed. Air-bladder 

 simple. Adipose fin present. Ovaries laminated ; the eggs fall 

 into the cavity of the abdomen, there being no oviduct. Pyloric 

 appendages none. 



Genus Prototroctes, Gunth. 



General habit of Corregonus. The scales on the front part of 

 the body irregularly arranged in series descending obliquely 

 forward. The dorsal fin occupies a position somewhat posterior 

 to that of the ventrals, which are in the middle of the length of 

 the body, and composed of seven rays. Adipose fin, small ; 

 caudal emarginate ; anal of moderate length. Eye of moderate 



