BY W. MACLEAY, E.L.S. 347 



expanded by air. Ventral fins none. No pelvic bone. Air 

 bladder absent. An accessory opercular gill. 



The seas of the whole World. 



1066. Orthagoriscus mola, L. 



Gunth., Cat. Fishes VIII., p. 317. " Sun Fish." 



Body elevated, its depth being more than the length. Skin 

 rough, minutely granulated. Dorsal and anal fins narrow, high. 

 Eye much nearer to the upper profile than to the lower. 



Australian Seas. 



A stuffed specimen of this Fish in the Macleay Museum, 

 captured about six years ago in Port Stephens, measured about 

 ten feet in length, and nearly fourteen feet in height. 



Sub-class II. PALYICHTHYES. 



Fishes with the skeleton wholly or partly cartilaginous. Heart with 

 a contractile bulbus arteriosus; intestine with a spiral valve; optic 

 nerves non-decussating. 



Order I. GANOIBT^. 



Fishes with the skeleton more or less ossified. Bulb of the aorta 



muscular, with numerous valves. Branchicr free ; gill-cavity protected 



by a gill-cover. Intestine with a spiral valve. Optic nerves not 

 decussating. Ventral Jins abdominal if present. 



Genus Ceratodus, Agassiz. 



A genus formed by Agassiz on a fossil tooth. It probably is 

 referable to the Family Sirenoidci. 



1067. Ceratodus Forsteri, Krefft. 



Proc. Zool. Soc, London, 1870, p. 222, pi.— figs. 1-2-3. 



General form of Osteoglossum ; scales large, cycloid. L. lat. 

 35. L. transv. 8. Vent in the posterior third of the total length. 



