74. SCOMBRID^ EUTHYNNUS. 
429 
strongly keeled, broader than deep. Corselet indistinct. Scales rather 
large. Pectoral reaching beyond second dorsal and anal, inserted a 
little below level of pnjjil, its base a little wider than the large eye; 
ventrals short. Head 3^’, depth 3J. D. XIY-II, 12-VIII; A. 11, 12- 
VII. Ij. 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 our Atlantic. coast. 
{Scomber alatunga Gmel. Syst. Nat. 1788, 1330, misprint for alalonga, fide Cuv. & Val. : 
Thijnmis alaJoiiga Cnv. & Val. viii, 120: Thynnus pacificus Cuv. & Val. Aiii, 133: 
Thytmus albacora, alalonga, and pacificus Gunther, ii, 36.''», 36G : Orcynus pacificus Cooper, 
Proc. Cal. Acad. Nat. 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. {Tutuiies.) 
677. ©. tSiyciiinis (Linn.) Poey. — Tunny ; Horse Maclcerel; Albicore. 
Dark blue above; below greyish with silvery spots. Mouth rather 
large ; posterior margin of jireopercle somewhat shorter than inferior. 
Eye small. Dorsal and anal falcate; caudal very widely forked ; pec- 
torals reaching nearly to end of spinous dorsal. Head 3| in length ; 
depth 4. D. XIV-I, 13-IX; A. I, 12-YHI. Xorth Atlantic, on both 
coasts; the largest of the Scombridcc, reaching a length of 10 feet or 
more and a weight of half a ton. 
{Scomber thynnus LiUm. Syst. Naf. : Thynnus secundo-dorsalis Storer, Fish. Mass. 65: 
Thynnus thynnus Giinther, ii, 362: Tnynnus xndgaris C. &.V. viii, 58: Thynnusbrachyp- 
terus and coretta Gunther, ii, 363.) 
218.— KUTEIYi^MUS Lfitken. 
Little Ttinnies. 
{Thynnus Lfitken : Thynnichthys Giglioli ; both names preoccupied.) 
(Lfitken 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 haemapophyses. This organization is common 
to Th. thunnina {alliteratus) and Th. pelamys, and is found modified in 
Spiolia Atlantica, 1880, 596. 
