135 



one feeble row on npper jaw. Tongue short, feebly armed. Maxillary not 

 extending beyond eye. Snout conical, and receiving the lower jaw, which is 

 shorter. Dorsal fin over the ventral, and in advance of the vent. Abdominal 

 cavity black. Intestine folded, and 3|- times the length of the abdomen. 

 Stomach thin and membranous. Shiny patch on the cheek, but no silvery 

 line on the side. 



These characters at once distinguish this fish from either of the preceding 

 species. It is possible that difference of growth might in them give rise to 

 their distinguishing features, but this fish cleai-ly differs in the dentition, form 

 of mouth and intestine, which indicate a difierent kind of food, and also in the 

 number of rays and jjosition of the dorsal fin. The specimens I have obtained 

 of this fish present a great deal of variety, but only in the colouring, which 

 varies from a general silvery hiie, slightly brown on the back, to a rich red- 

 brown on the back speckled with grey, and a rich yellow, almost golden, tiiige 

 on the belly. 



Plate XIX., fig. 2, is a full-size drawing of a specimen obtained for me by 

 Mr. Travers, from the Maitai River, Nelson, and with which he furnished the 

 following notes : — 



"These fish appear at the mouth of the Maitai River usually in the early 

 part of October, evidently from the sea ; at what period they return to the sea 

 I am unable to say. 



"The migration beyond the influence of the tide does not take place 

 immediately after the fish leaves the sea, for they evidently ascend and 

 descend daily as far as the tide- way is felt, ascending with the flood and 

 descending with the ebb, probably the better to prepare for their contixLuance 

 in purely fresh water during the period of spawning. They occur in consider- 

 able shoals, and appear at first to prefer the shallower and slower-flowing parts 

 of the river, basking in the sun on the shingle beds. They rise to various 

 kinds of fly and moth, and are taken also with the worm as a bait. As they 

 descend the river, they change colour from a dull silver grey below to a rich 

 brown, assimilating, in this respect, to the colour of the river-bed. In the 

 shoals the fish are of various sizes, from nine and ten inches to five and six in 

 length." 



Plate XVIIl., figs. 4 a and 4 b, is the life-size drawing of the head of a 

 specimen* that was obtained in the Hutt River, in January, 1870, at which 

 season they were ascending from the sea in immense shoals, the females being 

 gravid and swollen to enormous size. 



They are found in most of the streams in the colony, and are highly 

 esteemed as food, but have not the flavour of the true Trout. 



The following table shows the actual dimensions of average full-sized 



* Named Coregonus, by roistake on the plate. 



