139 

 Cyclothone, Goode & Bean. 



Cyclothone, Goode and Bean, Bull. Mns. Coinp. Zool. X., 1883, p. 221, and Oceanic Ichthyology, p. 99 : Jordan 

 and Evermann, Fishes N. Amer., p. 581. 



Sigmo T s, Gill, Proc U. S. Nat. Mas. VI., 1883. p. 256. 



Neostomii, Vaillaut, Exp. Sci. Travaillenr et Talisman, Poiss., p. 96. 



Body elongate, compressed, without scales. Series of inconspicuous lumin- 

 ous spots along the ventral aspect of the body from the chin to the caudal fin. 

 Head compressed, the bones thin but ossified. Cleft of mouth oblique, extremely 

 wide, the maxilla, which extends nearly to the angle of the preoperculum, 

 forming much the greater part of the margin of the upper jaw ; the lower jaw 

 projecting. Both jaws with a single series of needle-like teeth, large ones 

 usually alternating with small ones. Teeth on the palatine and pterygoid bones 

 usually present. Bye moderate, or small. 



Gill-openings very wide : numerous long bristle-like gill-rakers. No 

 pseudobranchiaa. Branchiostegals numerous. 



Dorsal fin short or of moderate length, situated in the after half of the body, 

 arising opposite the origin of the anal. Anal long. Caudal forked. Adipose 

 fin, when present, small. Pectorals and ventrals well developed. 



A long slender air-bladder is present in one of the Indian species. 



Distribution : Atlantic, Antarctic, Indo-Pacific. 



114. Cyclothone elongata (Gthr.). 



Gonostoma elongat am, Giinther, Ann. Mag. Nat. Hist. II. 1878, p. 187 ; and Challenger Deep-Sea Fishes, p. 173, 

 pi. slv., tig. B : Alcock, Ann. Mag. Nat. Hist. (6) VIII., 1891, p. 127, and X., 1892, p. 354. 



Sigmops stigmaticus, Gill, Proc. 0. S. Nat. JIua. VI., 1883, p. 256. 



Cyclothone elongata, Goode and Benu, Oceanic Ichthyology, p. 101, fig. 119: Jordan nnd Evermann, Fishes 

 N. Amer , p. 583. 



B. 11. D. 13. A. 29-30. P. 11-12. V. 7-8. 



Length of the head two-ninths, height of the body one-seventh of the total 

 length without the caudal. 



Length of the eye about two-thirds that of the snout, between a seventh 

 and an eighth that of the head, less than the width of the interorbital space. 

 Nostrils small, situated on top of the snout ; the posterior the larger. 



Mouth-cleft extremely wide, the maxilla reaching to the angle of the pre- 

 operculum. About 14 or 15 large needle-like teeth (two or three of which 

 belong to the premaxilla) with minute teeth between them, on each side of the 

 upper jaw ; about ten large teeth, with small teeth between them, on each side 

 of the lower jaw. Small teeth on the palatines and pterygoids, the anterior 

 palatine tooth somewhat enlarged. 



Gill-laminae very short ; gill-rakers numerous, long and bristle-like. Bran- 

 chiostegals very short. 



