26 1 



Key to the indo-australian species of Cestracus. 



1. No teeth on vomer. Origin of first dorsal far behind 

 end of pectorals, which reach to loth lateral scale. 



End of snout blunt C. plicatilis p. 261. 



2. Two patches of teeth on vomer. End of snout pointed. 

 Pectorals ending below origin of first dorsal, oppo- 

 site to 1 2th or 13th lateral scale. 



a. Origin of second dorsal opposite to 22nd — 24th, 



that of anal opposite to 20th — 22nd lateral scale. C. goldiei p. 262. 



b. Origin of second dorsal opposite to 27th — 28th, 



that of anal opposite to 25th lateral scale . . . . C. oxyrhynchus p. 263. 



I. Cestraeus plicatilis C.V. 



Cestraeiis plicatilis Cuvier & \'alenciennes. Hist. nat. I'oissons XI. 1836, p. 157. 



Cestraeus plicatilis Bleeker, Journ. Ind. Arch. III. (1848) 1849, p. 67. — Nat. 

 Tijdschr. Ned. Ind. II. 185 1, p. 213. 



Agonostoma plicatile Giinther, Cat. Brit. Mus. III. 1859 — 1861, p. 461. 



Agonostoina plicatile Bleeker, Ned. Tijdschr. Dierk, IV. (1871) 1872, p. 143. 



Agonostoma plicatile Giinther, Fische der Sudsee II. 1876, p. 219. 



Cestraeus plicatilis M. Weber & de Beaufort, in Sarasin & Roux, Nova Cale- 

 donia, Zoologie II. Livr. i, N". 2, 1915, p. 27. 



D'. IV; D-. II. 7; A. III. 8— 9; p. ca. 20; V. 1.5; L.l. ca. 45; 

 L. tr. 14. 



Elongate, rostro-dorsal profile convex. Height nearly 4, about 

 4Y4 in length with caudal; head bluntly pointed, nearly 4-/5, 

 about 5'/., in length with caudal. Eye more than 4 times in 

 head, twice or more in convex interorbital space, conspicuously 

 shorter than snout and about one third shorter than postorbital 

 part of head. Intermaxillaries, covered by a rather thick lip, 

 reaching to vertical through anterior margin of pupil. Mandible 

 somewhat included. Only the intermaxillaries with a row of 

 small teeth. Origin of first dorsal midway between end of 

 snout and base of caudal, separated by about 23 scales from 

 end of triangular patch of small scales behind upperlip and 

 opposite to about 14th lateral scale. Origin of second dorsal 

 opposite to about 23th lateral scale and about 2 scales behind 

 that of anal, the base of which is longer. Both fins are slightly 

 emarginate as also caudal. Pectorals shorter than head, their 

 end is separated by 4 — 5 scales from vertical through origin 

 of first dorsal. Least height of caudal peduncle about twice 

 in length of head and nearly one third shorter than its length. 

 Dark-greenish above, sides grayish, white below. Fins dark 

 distally. Length 325 mm. 



