354 NEW-YORK FAUNA. 
THE LONG-TAILED PORBEAGLE. 
Lamna CAUDATA. 
PLATE LXII. FIG. 205. a. UNDER SIDE OF HEAD; 0. A TOOTH., 
Carcharias terre-nove? Ricuarpson, F. B. A. Vol. 3. p. 289. (Young male.) 
Characteristics. Upper caudal lobe much elongated, and furnished with an accessory lobe at 
the tip. Teeth triangular, serrated. No caudal carina. Length three to 
six feet. 
Description. Body more elongated and cylindrical than in the preceding. Surface rough- 
ened to the touch, when the hand is moved towards the head. Snout prominent, pointed, 
broad, thin, and of a firm consistence. Eyes small, latera!, oval. Nostrils small, and be- 
neath the snout. Mouth large (fig. a.), susceptible of great dilatation, crescent-shaped, and 
armed with four or five series of triangular teeth (fig. b.), serrated on their edges ; the largest 
were six-tenths of an inch long. Branchial apertures admit the passage of two fingers, and 
all are anterior to the base of the pectorals. The first dorsal fin triangular in its general 
shape, quadrilateral, one foot high, widely and regularly concave on its upper margin, recti- 
linear along its posterior margin, and pointed ; it is twelve inches from its anterior base to its 
posterior tip; arises over about the middle of the base of the pectorals. Second dorsal small, 
0-3 high, with a base half an inch long; placed over the anal. Pectorals eighteen inches 
long, pointed, triangular, with a base of ten inches. Ventrals small, nearer the anal fin than 
to the pectorals, of a very firm texture, emarginate beneath, and terminating in a long point 
behind. The vent lies between them. ‘The anal similar in size and shape, and beneath the 
second dorsal. Caudal fin with a deep indentation at its base. The upper lobe two feet long, 
and furnished with a dilated fin near its tip; the lower lobe ten inches long. All the fins, with 
their posterior edges, thin and ragged. 
Color. Uniform dusky hue above, tinged with bluish, and forming a bluish grey ; lighter 
colored on the sides of the head and body ; white beneath. Irides greenish blue. 
Length seven feet four inches. Weight one hundred and sixty-one pounds. 
I am indebted to Mr. Carson Brevoort, of this city, for the drawing which illustrates this 
species. He captured it in September, at Brenton’s reef on the coast of Rhode-Island ; and 
although I have seen several specimens of the young from this harbor, this is the first adult 
specimen of which I have been able to obtain a good figure. The position of its first dorsal, and 
its unequal lobed tail, is a new form under this genus. It clearly cannot, from the position 
of its branchial apertures, be arranged under Carcharias. In many particulars, it is never- 
theless closely allied to the C. ceruleus previously described. When captured, the stomach 
was filled with large fish; too much injured, however, to determine the species. 
