948 Bulletin 47, United States National Museum. 



Rachyentron bears to Echeneis, as Dr. Gill has shown, is not connected 

 with any intimate homology. (Scombridce, part, Giinther, Cat., n, 375, 

 1860; EacMcentridce, Gill, Proc. U. S. Nat. Mus., 1895.) 



430. RACHYCENTRON, Kaup. 



Rachycentron, KAUP, Isis, xix, Col. 89, 1826, (typus). 



Itachicenlron, KAUP, Isis, xx, Col. 624, 1827; emended spelling. 



Les Elacates, CUVIER, Kegne Animal, Ed. 2, n, 203, 1829. 



Elacate, CUVIEB & VALENCIENNES, Hist. Nat. Poiss., vnr, 328, 1831, (malabarica = canadus). 



Characters of the genus included above, (pu^tr, lower part of back ; 

 KevTpov, spine.) 



1346. EACHICENTKON CANADUS (Linnaeus). 

 (SERGEANT FISH ; CRAB EATER ; BONITO ; COBIA.) 



Head 4; depth 5f. D. VIII-I, 26; A. II, 25. Head much depressed; 

 mouth moderate, the short maxillary reaching front of orbit. Pectorals 

 broad and falcate ; caudal deeply emarginate, the upper lobe slightly the 

 longer. Lateral line wavy and irregular, descending posteriorly. Olive 

 brown, sides with a distinct broad band of darker, and a less distinct 

 band above and below it ; silvery below. Length 5 feet. Warm seas ; 

 common on our Atlantic Coast in summer, especially in Chesapeake Bay 

 and southward ; north to Cape Cod ; not recorded from the Eastern 

 Pacific, but abundant in the East Indies. (Name from Canada, where the 

 species is not found.) 



Gasterostens canadus, LINNAEUS, Syst. Nat., Ed. xn, 491, 1766, Carolina. (Coll. Garden.) 



Scomber niger, BLOCH, Ichthyologia, plate 337, 1793. 



Centronotus gardenii, LACEPEDE, Hist. Nat. Poiss., in, 357, 1803, Carolina. 



Centronotus spinosus, MITCHILL, Trans. Lit. and Philos. Soc. N. Y., i, 490, pi. 3, fig. 9, 1815, New 



York. 



Elacate pondicerianu, CUVIER & VALENCIENNES, Hist. Nat. Poiss., vin, 329, 1831, Pondicherry. 

 Elacate motta, CUVIER & VALENCIENNES, Hist. Nat. Poiss., vin, 332, 1831, Orixa. 

 Elacale malabarica, CUVIER & VALENCIENNES, Hist. Nat. Poiss., vin, 332, 1831, Malabar. 

 Elacate atlantica, CUVIER & VALENCIENNES, Hist. Nat. Poiss., vin, 334, 1831, Brazil. 

 Elacate canada, DE KAY, N. Y. Fauna: Fishes, 113, pi. 25, fig. 77, 1842. 

 Elacate I ivittata, CUVIER & VALENCIENNES, Hist. Nat. Poiss., vin, 338, 1831, Molucca. 

 Elacate falcipinnis, GOSSE, Jamaica, 208, 1851, Jamaica. 

 Elacate nigra, GUNTHER, Cat., n, 375, 1860. 

 Elacate canada, JORDAN & GILBERT, Synopsis, 418, 1883. 



Family CXXVIII. NOMEID^E. 



Body oblong, compressed, covered with cycloid scales ; lateral line con- 

 tinuous and unarmed ; head compressed ; opercula unarmed ; nostrils 

 double ; mouth with a lateral cleft ; upper jaw scarcely protractile ; teeth 

 small and conical, on the palate as well as jaws ; gill membranes free 

 from the isthmus ; branchiostegal rays 5 or 6 ; dorsal more or less divided, 

 and with the spinous portion shorter than the soft, but well developed, 

 and the spines slender. Skeleton with numerous vertebrae (in Nomeus 

 16 + 25) ; pyloric appendages very numerous. Genera 6 or 8 ; species 



