N o VI.] NOTICES OF THE FISHES. 70 



/ 



The 



arches unite nearly at the moesial 



line of the tongue. There are ten oblique rays in the branchiosiegous membranes. 



The 



The stomach is rather 



small. The caeca, from thirty to thirty-six in number, are simple, cylindrical, and 

 from one to two inches long. 



Fins. — The dorsal fin is situated 6pposite to the ventrals. The anal fin is triangular 

 with the apex of the triangle truncated ; it has eighteen rays. The caudal fin is large 

 and very entire, truncated with a slight rounding of the angles, and entirely devoid 

 of a crescentic form. Its outline is wedge-shaped. 



This fish is inferior to the English salmon in size, its flesh is red, and it is taken in 



months of July and August, in the Salmon Leap, at Bloody 



Mine 



Pallas 



Itin. ; and with the plates of those indicated by Cuvier, Reg. Animal, ii. p. 162, from 

 all of which it appears sufficiently distinct. It resembles the S. Eriox in its 

 caudal fin. 



Salmo Mackenzii. 



lnconnu, Mackenzie's Voyages in North America, p. 9, and elsewhere, and of tlie Canadian Voyagers. 

 S. corpore sub-tereti elliptico-lanceolato, capite longo : rostro truncato, ore dentibus parvis confertis 

 muni to, maxilla inferiore longiore.— Tab. xxr. Fig. 1. 



Body roundish : lateral outline betwixt elliptical and lanceolate, tapering towards 

 the tail. Lateral line straight. 



Colour of the back and sides changing from bluish to greenish 

 moved in the light : of the belly bluish-white. 



Scales sub-orbicular, four lines in diameter, possessing much pearly lustre. 



The head is long and compressed, but a little flattened above. The vertex is 



grey 





covered with smooth skin. 



betwixt 



the orbits. The orbits are oval and large — they are placed about an inch from the 



opercu 



lum 



lvery lustre. The operculum and sub- 

 operculum form, by the junction of their smooth even posterior margins, a very 

 regular segment of a circle rather greater than a semicircle. They form about one- 



third of the margin of the large gill openings, the remaining two-thirds being 

 formed by the branchiostegous membranes. The pre-operculum has a lunated form, 

 and leaves a small naked cheek not greater than its own breadth bet 



double range of suborbitar bones. 



number 



a circular patch, the greatest part of which lies posterior to the orbit ; a narrow thin 

 plate, running out from them along the under margin of the orbit, again expands into 



4X2 



