TUNNY. 
95 
Corset appearing when recent from the water. Pectoral fin 
en er, in a depression of the surface, eleven inches long, but 
“ot reaching to the termination of the first dorsal fin ; by which, 
^ong other marks, it is distinguished from the Germon or 
ccg-finned lunny. The corset line runs from the upper 
®aigm of the pectoral fin, and in a waved form passes up to 
t e second dorsal; but before its rise the lateral line passes off 
*■0 the tail; at its termination a strong elevated ridge, with a 
® ’ght converging ridge above and below at the origin of the 
tail. 
The first dorsal fin begins nearly above the origin of the 
pectorals, with, in different specimens, thirteen and fourteen 
firm rays; the first rays elevated, but becoming shorter as they 
extend close to the second dorsal, and all of them received 
into a chink. Second dorsal and anal not opposite, both hook 
shaped, their substance too stout to allow of counting their 
rays. Pectorals with thirty-two rays. Ventral fins strong, sunk 
into a depression, with six flat rays. The number of false fins 
iners in different examples; varying from ten to nine above, 
and from nine to eight below. The tail greatly incurved, and 
8 ender towards the extremities; but the circle at the middle 
is interrupted by a double projection, forming it into two fins, 
^ith thirty rays. The tongue has a raised border or ridge on 
each side, its colour black. Colour of the back, top of the 
ead, and jaws black, with a tint of blue, lighter at the sides; 
the belly white. Pinlets bright yellow. 
The physiological condition of the family of the Mackarel is 
®iost highly developed in the Tunny, and is highly characteristic. 
Its Vessels are so filled with red blood, as to give the flesh 
the appearance of beef; and in consequence of this abundance 
®f red particles in the circulating fluid, the heat of its body 
tPas found by Dr. Davy to be considerably higher than that of 
the sea, and of any other fishes he had an opportunity of 
examining, and to maintain a vigorous circulation of this blood, 
which the high degree of heat is a cause and consequence, 
find the heart possessed of a well-marked and powerful 
organization. It is large, firm, and in shape an irregular solid 
tiiangle. Internally — there are cords which spring from that 
portion of the auricle, (the ofiice of which is to receive the 
tood from the veins,) which is close to its union with the 
