Eight spurious finlets above, seven below: sides of the abdomen with four longitudinal dusky bands.
S. Pelamys, Linn. Syst. Nat. torn. 1. p. 492. Thynnus Pelamys, Cuv. et Val. Hist. Nat. des Poiss. torn. viii. p. 82. pl. 214. Bonito, Yarr. Brit. Fish. vol. 1. p. 140. Bonite des Tropiques, ou Thon a ventre raye, Cuv. Reg. An. torn. 11. p. 198.
Rarely exceeds thirty inches. Yarr.
" Girth close behind the pectoral fins (in a specimen twenty-nine inches long) twenty inches; head conical, ending in a point at the nose; under jaw projecting; teeth few and small; tongue flat and thin; nostrils obscure, not in a depression; from the nose to the eye two inches and a half; gill-covers of two plates: body round to the vent, from thence tapering to the tail; near the tail depressed; lateral line at first descending and waved, becoming straight opposite the anal fin, from thence ascending and terminating in an elevated ridge, with another above and below the lateral line near the tail: eye elevated, round; iris silvery: from the nose to the pectoral fin eight inches and three-fourths, the fin pointed, four inches long, received into a depression: first dorsal fin seven inches long, four inches high, lodged in a groove; the first two rays stout, the others low: the body is most solid opposite the second dorsal, which fin and the anal are falcate: tail divided and slender: ventral fins in a depression. Colour a fine steel blue, darker on the back; sides dusky, whitish below: behind the pectoral fins is a bright triangular section of the surface, from which begin four dark lines, that extend along each side of the belly to the tail. Scales few, like the Mackerel" Couch, as quoted by Yarr. Number of fin-rays, according to Cuvier;
D. 15 - 1/12, and VIII; A. 2/12, and VII; C. 35; P. 27; V. 1/5.
Specimens of this fish, which is the Bonito of the Tropics so well known to navigators, are stated by Mr. Couch to have occurred occasionally on the Cornish coast. According to Stewart*, it has been also taken, though rarely, in the Frith of Forth; and, according to Dr. Scoulert†, in the Frith of Clyde. In the two last instances, however, it is doubtful whether the present species be intended, or the Pelamys Sarda of Cuvier ‡, to which also the name of Bonito has been applied. This last is found principally in the Mediterranean, and is characterized by a variable number of obliquely transverse bands extending from the top of the back to a little below the lateral line. The species here described inhabits the Ocean, and is particularly distinguished by four longitudinal bands on each side of the abdomen: the teeth are also much weaker than in the Pelamys Sarda.