432 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY IV. 



in single series on jaws, vomcr, and palatines. Dorsals two, the first 

 preceded by a procumbent spine. No finlets. Two strong spines before 

 the anal, connected by membrane. Pyloric coeca numerous. In all 

 warm seas, (r/ia/o'i/x^^ the ancient name of T. saurus; from -,"<*/";, 

 rough; oupa, tail.) 



68O. T. symtnctricus (Ayres) Girard. Horse Mackerl. 



Similar to T. Mtnni*, but slenderer and less compressed. Arch of 

 lateral line longer, as long as straight part, the junction of the two much 

 beyond tip of pectoral ; plates on the anterior part small, crowded, their 

 height less than half eye. Head 3$; depth 4. D. VIII-I, 31; A. 

 II-I, 27 ; Lat. 1. 48 + 47. Coast of California, from San Francisco south- 

 ward ; very abundant in summer. 



(Caranx symmctrims Ayres, Proc. Cal. Acad. Nat. Sci. i, 1855, 62; Girard, Pac. R. R. 

 Surv. Fish. 107.) 



981. T. saurilS Raf. Horse Mackerel; Skip Jack ; Saurcl. 



Greenish, sides silvery; a dusky opercular spot. Body more com- 

 pressed and deeper than in the preceding. Head rather long. Mouth 

 moderate, the maxillary reaching the front of eye. Eye large, equal to 

 snout, 4 in head ; arch of lateral line short, reaching scarcely beyond pec- 

 toral, 1 in straight part, the plates high, nearly as high anteriorly as 

 posteriorly, their height more than half eye. Head 3 ; depth 4. D. 

 VI II-I, 29; A. II-I, 28; Lat. 1. 40 + 37. L. 1 foot. Southern Europe; 

 occasional on our South Atlantic coast. 



(Scomber <rac7(itrLinn. Syst. Nat. i, 1758: Caranx traclnirun Lac6pede, iii, 63: ? Car- 

 <iii.i-<nnoritx plumierianus Lac^p. Hist. Nat. 1'oiss. iii, 84 : 1 Selar j(i)>nnirux Ulerkrr, Vrrh. 

 I '..-it. Gen. xx, vi, Japan, pi. 8: Trttchnrux xtuirux Rafiucsqne, 1. c. 5JO: Trachtirux trachurus 

 Gilnthei, ii, 41'J. 



220. DECAPTERUS Blecker. 



Mackerel Scads. 



( I'.li-i-Krr, Xuttmrk. Tydschr. 1-^.V). v, -117: type Caranr kurra Cuv. & Val.) 



I5ody elongate, little compressed, almost perfectly fusiform. Head 

 short, pointed. Month rather small ; jaws about equal, the dentition 

 feeble. A supplementary maxillary bone. I'remaxillaries protraetile. 

 Scales moderate, enlarged and sjn'iions along lateral line posteriorly; 

 second dorsal and anal each with a single detached finlet ; free anal 

 spines very strong. Abdomen rat her shorter than anal fin. Gill-rakers 

 long and slender. Species numerous. ('T;/a?,ten; 7rrs/><)y, fin ; there being 

 ten fins, counting the spin ions (inlets and excluding the free spines.) 



6S2. D. plllK'tatias (Agassi/.) (Jill. Sritrt : Pound L'obin. 



r.luish above, silvery below; a dark opercular spot. Eye rather 

 small, shorter than snout, about equal to the width of checks or the ill- 



