428 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY IV. 
Atlantic Ocean, on both coasts ; abundant ; a food-fish of rather low 
grade. 
(Scomber pelamijs Briiunicli, IcbtL. Massil. 1768, 69, not of L. Syst. Nat. : Scomber 
mediterraucus Bloch & Schn. 1801, 23: Pchimys sarda Storer, Fish. Mass. 63: Pelamys 
sarda Giiuther, ii, 367 : Sarda pelamys Gill.) 
07'>. S. cUaiHcsasas (Ciiv. & Val.) J. & G. — Bonito ; Skip-jack; Tana. 
Dark metallic blue; sides dusky; about 5 blackish stripes running 
obliquely upward and backward from the pectoral region to the upper 
edge of the tail, these variable in number and direction. Head pointed, 
conical, naked. Maxillary reaching posterior border of eye. Pectorals 
placed just below the level of the pupil, scarcely half as long as head. 
Gill-rakers long, strong, about 18 below angle. Corselet moderately 
developed. Head 3f; depth about 4. D. XVIII-I, 12-VlII; A. II, 
11-YI. L. 2-3 feet; weight IG pounds. San Francisco to Patagonia 
and Japan; abundant northward in summer; very similar to the pre- 
ceding but with the spinous dorsal always shorter. 
(Pelamys chilensis Ciiv. & Val. viii, 163: Pelamys lineolata Girard, U. S. Pac. R. R. 
Surv. Fish. 106: Pelamys chilensis Giiuther, ii, 106: Pelamys orientalis Giiuther, ii, 106.) 
21 :'.— OKCYI^US C uvier. 
Tunnies. 
(Thynnus Cuvier, 1817, preoccupied in entomology.) 
(Cuvier, Regne Anim. 2d ed. 1829: type Scomber thynnus L.) 
Body oblong, robust, with very slender caudal peduncle. Head con- 
ical. Mouth wide, with one series of small, conical teeth in the jaws and 
bands of minute villiform or sand-like teeth on the vomer and palatines. 
Scales jiresent, those of the pectoral region forming an obscure corselet. 
First dorsal of 12-15 spines which grow gradually shorter backward, the 
interval between last spine and second dorsal slight ; second dorsal and 
anal short and rather high, each with 8-10 finlets; ventrals moderate; 
pectorals moderate or very long, rather below the level of the eye. Ver- 
tebrae normal, the lower foramina very small. Fishes of the open seas ; 
often attaining a %'ery great size. {6pxu>ocj an ancient name of 0. thyn- 
nus.) 
a. Pector.al fius sabre-shaped, reaching heyoud end of second dorsal. (Albicores.) 
C70. O. alaBont^a. (Gmel.) Risso. — Albicore; Alilonghi; Germon. 
Bright metallic steel-blue; belly bluish silvery; fius colored like the 
body ; ijectorals blackish, with silvery lustre. Body little compressed, 
regularly elliptical, its weight great in proi3ortion to the length. Tail 
