418 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY IV. 
tbe raj's all flat, broad and stiff, being partially ossified, although showing 
the usual articulation ; upper rays of pectoral broader than the others. 
One species known. rhomb; /i'p, hand.) 
660. 15. osleochir (Cuvier) Gill. 
Light brown; underside of head, ventral line, part of ventrals and a 
spot on pectorals pale. Mouth very small, maxillary not nearly reaching 
to the line of the orbit. Disk very large, broader and rougher than in 
Echeneis remora^ extending forwards beyond the tip of the snout. Cau- 
dal fin emarginate, with rounded angles. Head in length ; disk 2^ ; 
width between pectorals 5. D. XYIII — 21; A. 20; P. 20. West Indies, 
north to Cape Cod; parasitic on species of Tetrapturus. 
(Echeneis osteoclnr Cuvier, Regne Anim : Uc/iewm osfeoc/tir Guntlier, ii, 331: Echeneis 
telrapturorum Poey, Memorias, ii, 25C.) 
Family LXXI.— ELACATID^. 
{The Crab-eaters.) 
Body elongated, fusiform, siibcylindrical, covered with very small, 
smooth scales. Head rather broad, low, pike-like. Mouth rather wide, 
nearly horizontal, the maxillary about reaching front of eye; both 
jaws, vomer, palatines, and tongue with bands of short, sharp teeth; 
lower jaw longest. Premaxillaries not protractile. First dorsal repre- 
sented by about eight low, stout, equal, free spines, each spine depressi- 
ble in a groove; soft dorsal long and rather low, somewhat falcate, sim- 
ilar to and nearly opiiosite the anal; two weak anal spines, one of them 
free from the fin ; ventrals thoracic, I, 5 ; caudal fin forked ; no caudal 
keel; no fiulets; no sucking-disk; no air-bladder. Branchiostegals 7. 
Pyloric cceca branched. Vertebrae more than 10 + 14. A single genus 
with lu’obably but one species, a large, strong, voracious fish, found in 
all warm seas. {Scombridcc part, genus Elacatej Giinther, ii, 375.) 
20§.— ELACATE Cuvier. 
(Cuvier, Regne Anim. ed. 2d, 1829: type Elacate malabarica Cnv. — Gas fet'osteus 
canadus L.) 
Characters of the genus included above. {rj?.axa-r/^ a spindle or an 
arrow, from the form of the body.) 
661. E. Canada (Linn.) Gill. — Crah-cater ; Cobia. 
Olive brown, sides with a distinct broad band of darker, and a less 
distinct band above and below it; below silvery. Head much depressed. 
Mouth moderate, the short maxillary reaching front of orbit. Pectorals 
broad and falcate ; caudal deeplj* emarginate, the iqtper lobe slightly 
