652 



FISHES. 



falling into the Straits of Magelhten and in the rivers of Chile 

 and the Falldand Islands. It has the general appearance of a 

 Trout, but is naked. Prototrodcs, with the habit of a Core- 

 gonus, scaly, and provided with minute teeth ; one species {P. 

 marwna) is common in South Australia, the other (P. oxy- 

 rhynchus) in New Zealand. The settlers in these colonies call 

 them Grayling; the Maori name of the second species is 

 " Upokororo." 



Eighteenth Family — Gonorhynchid^. 



Head and tody entirely covered with spiny scales ; mouth 

 with barbels. Margin of the upper jaw formed by the inter- 

 maxillary, which, although short, is continued downwards as ■ a 

 thick lip, situated in front of the maxillary. Adipose fin none; 

 the dorsal fin is opposite to the ventrals, and short, like the anal. 

 Stomach simple, without blind sac; pyloric ap2)endages in small 

 number. Pseudobranchice ; air-bladder absent. Gill-openings 

 narrow. 



Fig. 297. — Gonorhynchus greyi. 



Fig. 298. — Scale of Gouorliynchus greyi. 



One genus and species only {Gonorhynchus greyi) is known ; 

 it is a semi-pelagic fish, not very rare off the Cape of Good Hope, 

 and in the Australian and Japanese seas. From 12 to 18 inches 



