92 TELEOSTEI: SYNENTOGNATHI. — XVI. 



b. Body little compressed, its breadth more than I its greatest depth. 



Tylosurus, 97. 

 bb. Body much compressed, its breadth not half its greatest depth. 



Athlennes, 98. 

 art. Jaws with minute teeth or none. 



c. Maxillary grown fast to premaxillary; one or both jaws produced in 

 a long beak. 

 d. D. and A. with finlets; scales small; both jaws produced. (Scom- 



beresociiuB) Scomberesox, 99. 



dd. D. and A. without Unlets; upper jaw short, the lower much pro- 

 duced, (fie mi nun plume.) 

 e. Pectorals moderate, not longer than head without beak; body 



rather stout; sexes similar Hemiramphus, 100. 



ee. Pectorals very long, twice head without beak; V. short; body 

 very slender, almost band-like . Euleptorhamphus, 101. 

 cc. Maxillary distinct from premaxillary ; both jaws short. (Exocaz- 

 tince.) 



f. Hoof of mouth with teeth; body elliptical in cross-section; V. 

 long, inserted behind middle of body; D. high, its base about 

 equal to anal base ; snout and lower jaw short. 



Parexoccetus, 102. 

 ff. Roof of mouth nearly toothless; body quadrate in cross-section; 

 P. long, about reaching base of C. 

 g. Ventrals inserted anteriorly, much nearer tip of snout than 

 base of C, small, not used as organs of flight. 



Halocypselus, 103. 



rjg. Ventrals inserted posteriori}', nearer base of C. than snout, 



used as organs of flight Exoc<etus, 104. 



97. TYLOSURUS Cocco. (tvXos, callus, i. e. keel; oipd, tail.) 



a. Caudal peduncle depressed, with a dermal keel. 

 b. D. and A. short, each of 14 to 10 rays ; last rays of D. low ; jaws slender. 



220. T. marinus (Bloch & Schneider). Gar-fish. Bill-fish. 



Needle-fish. Silver Gar. 



Scales and bones green : green, a silvery lateral band ; a dark 

 baron opercles: P. pale. Head 2|; depth 5^ in head. Lat. 1.300. 

 L. 4 feet. Maine to Texas, abundant ; ascending rivers. 



bb. D. and A. long, each of 21 to 24 rays ; last rays of D. sometimes ele- 

 vated; caudal keel black. 



221. T. acus (Lacepede). Hound-fish. Agujon. Beak 

 long, twice rest of head. Green, no lateral stripe. Lat. 1. 380. L. 

 5 feet. West Indies and Mediterranean; occasional N. to Cape 

 Cod. (Eu.) (Lat., needle.) 



98. ATHLENNES x Jordan & Fordice. (a@\evvT)<;, without mu- 



cosity, an ancient epithet applied to Belone belone.') 



222. A. hians (Cuv. & Val.). Jaws long and very slender, the 

 upper arched at base, so that the mouth cannot be closed; tail not 



1 This name was inadvertently printed " Athlennes," and may remain so ; "Ablets 

 nes" was intended. 



I 



