74. SCOMBRIDvE EUTHYNNUS. 429 



strongly keeled, broader tliaii deep. Corselet indistinct. Scales rather 

 large. Pectoral reaching beyond second dorsal and anal, inserted a 

 little below level of pupil, its base a little wider than the large eye; 

 ventrals short. Head 3J; depth 3. D. XIV-II, 12-VIII; A. II, 12- 

 VII. L. 3 feet ; weight 15-20 pounds. In all warm seas, in the open 

 ocean ; abundant in summer in the Mediterranean and about the Santa 

 Barbara Islands; occasional on onr Atlantic coast. 



(Scomber alatunga Grnel. Syst. Nat. 1788, 1330, misprint for alalonga, fide Cuv. & Val. : 

 Thynnus alalonga Cuv. & Val. viii, 120: Thynnus pacificus Cuv. & Val. viii, 133: 

 Thy nmts albarora, alalonga, and pacificus Giinther, ii, 36r, 36G : Orcynus pacificus Cooper, 

 Proc. Cal. Acad. Nut. Sci. 18G3, 75: Orcynus germo Liitkeu, Spolia Atlantica, 1880, 473.) 



a. Pectoral fins comparatively short, not reaching beyond the end of the spinous dor- 

 sal. (Tunnies.) 



677. . thyBBiaus (Linn.) Poey. Tunny ; Horse Mackerel; Albicore. 



Dark blue above; below greyish with silvery spots. Mouth rather 

 large ; posterior margin of preopercle somewhat shorter than inferior. 

 Eye small. Dorsal and anal falcate; caudal very widely forked ; pec- 

 torals reaching nearly to end of spinous dorsal. Head 3f in length ; 

 depth 4. D. XIY-I, 13-IX; A. I, 12-VIII. North Atlantic, on both 

 coasts; the largest of the Scombridce, reaching a length of 10 feet or 

 more and a weight of half a ton. 







(Scomber thynnus Linn. Syst. Nat. : Thynnus secundo-cforsalis Storer, Fish. Mass. 65: 

 Thynn-us thynnus G'inther, ii, 38'2 : Tnynnus vulgaris C. &V. viii, 58: Thynnusbravhyp- 

 terus and coretta Giinther, ii, 363. ) 



21. EUTHYNNUS Liitken. 

 Little Tunnies. 



(Thynnus Liitken : Thynnichthys Giglioli ; hoth names preoccupied.) 

 (Liitken MSS. in Epist. Feb. 1881: type Thynnus thunnina C. &. V.) 



This genus differs from Orcynus, according to Liitken*, " (1) in the 

 absence of teeth on the vomer ; (2) by the complete absence of scales 

 outside of the corselet, while in the Orcyni of the same size the 

 skin is covered with small scales; the limits of the corselet in the 

 Tunny and Albicore are obscure, so that it cannot properly be said 

 that they have distinct corselets; and (3) by an important osteological 

 character, namely the peculiar development, in the form of a net-work or 

 trellis, of a portion of the abdominal part of the backbone, between the 

 vertebrae proper and the hsemapophyses. This organization is common 

 to Th. thunnina (alliteratus) and Tli. pelamys, and is found modified in 



* Spolia Allantiw, 1880, 596. 



