408 



BULLETIN OF THE BUREAU OF FISHERIES 



Reighardi has on the average fewer lateral-line scales, a somewhat longer head 

 and snout, and shorter paired fins. 



Reighardi differs from hoyi in having a shorter, more included, and less hooked 

 mandible, less sharply triangular head (as seen from the side), fewer gill rakers on the 

 first branchial arch, and fewer lateral-line scales. The comparative figures for the 

 last-named characters follow: 



Gill rakers on the first branchial arch: 



reighardi, (32) 33-36 (38). 



hoyi, (40) 42-46 (48). 

 Lateral -line scales: 



reighardi, (64) 66-73 (77), with 23 per cent more than 72. 



hoyi, (66) 73-80 (85), with 82 per cent more than 72. 



Reighardi has also on the average a somewhat smaller eye and shorter ventrals. 



Reighardi has many fewer gill rakers on the first branchial arch than artedi or 

 nipigon; also fewer lateral-fine scales and a longer snout and maxillary. ^These 

 characters are compared below: 



Gill rakers on the first branchial arch: 



reighardi, (32) 33-36 (38). 



artedi, (41) 46-49 (53). 



nipigon, (54) 56-59 (66). 

 Lateral -line scales: 



reighardi, (64) 66-73 (77) , with 23 per cent more than 72. 



artedi, (65) 71-76 (81), with 59 per cent more than 72. 



nipigon, (68) 72-77 (82), with 80 per cent more than 72. 

 H/S: 



reighardi, (3.3) 3.5-3.6 (4), with 24 per cent more than 3.6. 

 artedi, (3.5) 3.7-3.9 (4.2), with 92 per cent more than 3.6. 

 nipigon, (3.3) 3.5-3.8 (4), with 55 per cent more than 3.6. 

 H/M: 



reighardi, (2.2) 2.3-2.5 (2.7), with 10 per cent more than 2.5. 

 artedi, (2.5) 2.7-2.8 (3), with 98 per cent more than 2.5. 

 nipigon, 2.5-2.7 (3.1), with 78 per cent more than 2.5. 



Reighardi is also less pigmented throughout and has a proportionally longer 

 head. 



GEOGRAPHICAL DISTRIBUTION 



In Table 34 are given the data of specimens collected by me with 23^ and 2% 

 inch gill nets in 1922 and of specimens examined from the University of Toronto 

 collection. These data are platted on the map of the lake in Figure 2. The records 

 are distributed sufficiently widely over the lake to warrant the conclusion that 

 reighardi occurs throughout the lake where it can find suitable conditions. 



BATHYMETRIC DISTRIBUTION 



There are few data to indicate the depth preferences of this species. Only three 

 sets of the special 2^ an( l 2 M inch gill nets were made by me in the lake, and reig- 

 hardi occurred in two. Twenty per cent of the fish taken on July 25, 1922, off the 

 source of Nipigon River in 10 to 15 fathoms (record 16), belonged to this species, 

 while on the next day the catch off Macdiarmid in 30 fathoms had only 14 per cent 

 of this species (record 2). It is interesting here to give the relative abundance of the 



