440 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY IV. 
1815, 383: Argyriostis vomer Guutlicr, ii, 458: Selene argentea Lac^p^de, iv, 560: 
Arggreinsus pacificus Lockington, Proc. Cal. Acad. Nat. Sci. 1876: Selene argentea (adult) 
and Argyriosus vomer (partly grown) of most recent writers. Liitken, Spolia Atlantica, 
1880, 547, in which memoir the stages of growth of this and other species are fully 
described.) 
aa. All the fins very low, none of the rays i)roduced or filamentous in the adult. ( Vo- 
mer* Cuvier.) 
COl. S. setipisimas (Mitch.) Liitken. — Horse Fish. 
Greenish above, below golden or silvery. Young with a black blotch 
at origin of straight part of lateral line. Body oblong, rhombic, less 
elevated than in the other species ; profile anteriorly nearly vertical, 
highest above the eye, snout somewhat protruding, belly most arched 
in the young; mouth oblique; maxillary reaching vertical from front of 
orbit. Ventral fins minute; dorsal and anal very low, especially in the 
adult, the long rays disappearing very early ; pectorals falcate, about as 
long as head. Head 3^ in length; depth 1|. D. VIII-I, 21; A. II-I, 
17. Tropical America, north to Cape Cod ; not very common on our 
coasts. 
(Zeus setapinnis Mitch. Trans. Lit. & Phil. Soc. N. Y. 1815, 384: Argyreiosus setipin- 
nis Gliuther, ii, 453 : Vomer hroivni Cuv. & Val. ix, 189 : Vomer hrowni Dekay, New York 
Fauna, Fish. 127; Liitkeu, Spolia Atlantica, 1880, 543: Vomer curtus Cope, Proc. Acad. 
Nat. Sci. Phila. 1870, 119: Argyreiosus unimaculaius Hatcheldev.) 
224.— CIILOROSCOMBRUS Girard. 
(Micropteryx Agassiz, preoccupied.) 
(Girard, Proc. Acad. Nat. Sci. Phila. 1858, 168: typo Seriola cosmopolita Cvly. &Val. 
= Scomber chrysurus L.) 
Body oblong ovate, closely compressed, but not elevated ; the abdomen 
prominent anteriorly, its curve being much greater than the curve of the 
back. Occiput and thoracic region trenchant. Caudal peduncle very 
narrow, the fin widely forked. Scales small, smooth. Lateral line arched 
in front, unarmed. Head nearly naked. Preorbital low. Mouth rather 
small, oblique, lower jaw scarcely projecting; upper jaw protractile; 
maxillary broad, emarginate behind, with a large supplemental bone. 
Jaws, vomer, and palatines with feeble teeth, mostly in single series. 
First dorsal of feeble spines, connected by membrane; second dorsal 
and anal long and low, similar, much longer than the short abdomen. 
No finlets. Anal spines strong. Yentrals small; pectorals falcate. 
Gill-rakers long. {y?.ujpo<;, green ; (Txd!J.l3po<;, mackerel.) 
* Cuvier, R6gue Anim. ii, 1817: type Vomer browni Cuv. =Zeus setipinnis Mitchill: 
(Latin vomer, a plowshare.) 
