FISHES OF NEW ZEALAND. 57 



HAPLOCHITONIDJE. 



Body naked or scaly ; adijjose fiii jji-eseut ; margin of the upper jaw 

 formed by the intermaxillary ; opercular apparatus complete ; barbels 

 none ; gill openings rather wide ; pseudobranchi* well developed. 



Fresh water fishes from South America and South Australia. 



Prototroctes. 



Body oval, slightly compressed; dorsal rather behind the ventrals, 

 which are in the middle of the body, and composed of seven rays ; 

 adipose fin small ; caudal emarginate ; teeth minute, in a single series on 

 the jaws, vomer, and palatine bones ; gill openings rather wide ; bran- 

 cliiostegals six. 



Southern Australia. 



91. PROTOTROCTES OXYRHYNCHUS. Gunth. CM. 



Grayling-, 



P. oxyrhynchus, Gunth, P.Z.S., 1870. Retropinna opohororo, Hect., 



Trans. N.Z. Inst., III., 134. 



D. 11 - 12 ; A. 18 - 19 ; L. Lat., 100 ; L. Trans., 19. 



Length six and three-fifths that of the head, or five times the height of 

 the body ; snout conical ; lower jaw shorter. 



Reddish brown, paler below, sometimes speckled with grey on the 

 back ; variable in color. 



Waikato, Hutt, Maitai, Waimakariri, and Clutha. 



A skeleton is in the Museum, prepared by Dr. Knox. 



SALMONID^. 



Body covered with scales ; head naked ; margin of the ui)per jaw 

 formed by the intermaxillaries mesially, and by the maxillaries laterally ; 

 belly rounded ; a small adipose fin behind the dorsal. 



Fresh waters of the temperate and arctic northern regions. 



Retropinna. 



Body covered with scales of moderate size; cleft of the mouth 

 moderate or wide ; teeth in a single series on the jaws, vomer, palatines, 

 and pterygoids ; tongue with a double series of hooked teeth ; dorsal 

 situated far backwards, above the vent ; anal rather long ; caudal forked. 



Fresh waters of New Zealand only. 



