Teeth triangular, pointed; the edges not denticulated: caudal with the upper lobe nearly as long as the body.

S. Vulpes, Gmel. Linn. torn. i. partiii. p. 1496. Turt. Brit. Faun. p. 112. Blainv. Faun. Franc, p. 94. pl. 14. f. 1. Vulpes marina, Will. Hist. Pise. p. 54. tab. B. 6. f. 2. Carcharias Vulpes, Flem. Brit. An. p. 167. Long-tailed Shark, Penn. Brit. Zool. vol. iii. p. 110. pl. 14. Id. (Edit. 1812). vol. iii. p. 145. pl. 17. La Faux, ou Renard, Cuv. Beg. An. torn. ii. p. 388.

Length

Thirteen feet; the tail alone measuring more than six. Penn.

Description

(Form). "Body fusiform, appearing very much elongated in consequence of the relatively great size of the tail: skin very finely and equally shagreened above and below: first dorsal moderately large, triangular, elevated, adhering by almost the whole length of its base, in the middle of the back: the second exceedingly small, triangular, inclined, terminating behind in a very sharp point, and falling in a vertical line with the base of the anal, which is similar to itself: head small, rounded: snout short, conical: tail exceedingly long, in consequence of the great development of the caudal fin, which is in the form of a long sithe; upper lobe enveloping the extremity of the vertebral column, and separated by a notch from the lower lobe, which is moderately broad at its origin: mouth moderate, of a horse-shoe form, entirely beneath: vent at nearly the anterior third of the entire length: nostrils beneath, at the posterior third of the length of the snout, transversely oval: eyes lateral, large, occupying three-fifths of the length of the upper jaw: teeth similar in both jaws, triangular, very sharp, not denticulated, broad at the base, without any accessory points or tubercles: no temporal orifices: branchial openings nearly equal, entirely lateral, the last two somewhat smaller, nearer together, and reaching beyond the anterior margin of the pectoral fin: pectorals narrow, very much elongated, triangular; the adhering side much smaller, and attached for nearly its whole length: ventrals small, triangular, horizontal, adhering by two-thirds of their inner edge, the remaining portion free. {Colours). Bluish gray above, white beneath; the pectoral fins attached to the white portion." Blainv.

* Rarities of Gresham College, p. 90.

† Ichth. pl. 110.

Met with occasionally on the British coast, but not very plentiful. Derives its English name of Thresher from its supposed habit of attacking and striking the Grampus with its long fox-like tail *.