428 CONTRIBUTIONS TO NOKT1I AMERICAN ICHTHYOLOGY - IV. 



Atlantic Ocean, on both coasts; abundant; a food-fish of rather low 

 grade. 



..nth<r jx'Iiiiiii/x r.riiimirh, Iclith. M.iil. 1708,69, not of L. S\ >t . Nat.: N.//uVr 

 iiiiiK lllurh A. Schu. 1,-iOl, 23: Pclamys sarda Store r, Fish. Mass. 63: Prhtmyx 

 (Jiinther, ii, 3<>7: Sarda pelamya Gill.) 



675. S. chilciisis (Cuv. & Val.) J. & G.Honito ; Skip-jack; Tuna. 



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 halt' as long as head. 

 Gill-rakers long, strong, about 18 below angle. Corselet moderately 

 developed. Head 3 ; depth about 4. D. XVIII-I, 12-V1II ; A. II, 

 11-VI. L. 2-3 feet; weight 1C 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 cliilmxi* Cuv. & Val. viii, 163: Pelamys lineolata Girard, U. S. Pac. R. R. 

 Surv. Fish. 106: 1'rlamyn cliilcusin Giiuthur, ii, 100: Pelamya orientalis Guniher, ii, l(>(>. ) 



217. ORCYNUS Cuvier. 

 Tunnies. 



(Tliynnits Cuvier, 1817, preoccupied in entomology.) 

 (Cuvier, Regne Aiiim. 2d ed. 1829: type Sromlur llii/nnns 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 onthevomer and palatines. 

 Scales present, those of the pectoral region forming an obscure corselet. 

 First dorsal of 12-15 spineswhieh 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 fiulets ; ventrals moderate; 

 pectorals moderate or very long, rather below the level of the eye. Yer- 

 teline normal, the lower foramina very small. Fishes of tin- open seas; 

 often attaining a very great si/e. (<,.,,.;>,-, an ancient name of 0. tliyn- 

 nux.) 



a. iVrioral I'ms sal>n--^]i:i|ril, reaching liryoml end of second dnrsal. (.llbicorcs.) 

 <;; <i. O. :il:i5<>3iu:i < I " -. I //"'<<"'; .llilniujlii: <, i niton. 



lirighl metallic steel -blue; lielly l)luisli silvery; lins colored like, the 

 body; pectorals l.lackish, wit h ,-ih er\ lustre. r,o<ly little compressed, 

 regularly elliptical, its weight great in proportion to the length. Tail 



