REPORT OF COMMISSIONER OF FISH AND FISHERIES. [46] 

 Family LII.— OHAULIODONTID^. (44) 



148.— CHAULIODUS Bloch & Schneider. (133) 



536. ChauIioduB sloani Blocb & Schneider. B. Ev. (469) 



149— CYCLOTHONE' Goode & Bean. 



537. Cyclothone lusca Goode & Bean. B. 



150.— SIGMOPS2 Gill. 



538. Sigmops stigmaticus Gill. B. 



lin« nearly continuous, in a sigmoid curve; teeth of the jaws in several series, the 

 largest teeth in the inner row ; a single spike-like neural spine before dorsal ; branchios- 

 tegals, 5. Otherwise essentially as in Argyropelecus. {'Srepvov, breast ; Ttrvc, fold or 

 plait.) 



Sfernoptyx diaphana Hermann. 



Depth equal to distance between tip of snout and base of the very short tail. In- 

 terorbital space slightly concave ; posterior limb of preopercle bordering hind part 

 of orbit, and descending very obliquely, ending in two points. Pectoral scarcely 

 reaching ventrals, which are very small. B. 5, D. 9, A. 13, P. 10, V. 3. (Gunther.) 

 Atlantic ; lately taken in the Gulf Stream, about lat. 33<^. 



(Hermann, 1. c. ; Gtinther, V, 387 ; Goode & Bean, Bull. Mus. Comp. Zool., 1882, 220.) 



1 Cyclothone Goode & Bean. 



(Goode & Bean, Bull. Mus. Comp. Zool., 1882, 221 ; type Cyclothone lusca G. «fe B.) 



Body elongate, somewhat compressed (apparently covered with rather large, thin, 

 very caducous scales) ; lower parts with a series of luminous spots. Head conical j 

 cleft of mouth very wide, oblique extending behind eye, the lower jaw strongly pro- 

 jecting. Maxillary long and slender, sickle-shaped, closely connected with the short 

 premaxillary. Upper jaw with a single series of rather large close-set sharp teeth, 

 about every fourth one slightly longer than the rest, and directed slightly outward. 

 Lower jaw with similar teeth, subequal, directed forward, with a few canines in front. 

 A small patch of minute teeth on vomer; palatines smooth. Eye small, inconspicuous. 

 Gill openings very wide, the membranes free froni the isthmus. Gill rakers numerous, 

 long and slender. Pseudobranchise none. Branchiostegals (apparently 7 to 9). No 

 air-bladder. Dorsal and anal well developed, opposite each other. No adipose fin. 

 Caudal forked, its peduncle long and slender. Deep-sea fishes of small size, closely 

 related to the European genus Gonostoma. {KvxXoi, round; dioovrj, veil.) 



Cyclothone lusca Goode & Bean. 



Uniform black, the mucous pores inconspicuous. Maxillary extending backward 

 to a distance from tip of snout equal to length of head without snout; eye as long as 

 snout, 7 in head. Distance from snout to dorsal three times length of lower jaw, its 

 base as long as head. Second ray longest, f base of fin. Insertion of anal under 

 second ray of dorsal, its longest rays a little higher than those of dorsal. Pectoral, 

 7J in length of body. Distance from snout to ventral twice head; ventral 7 in body. 

 Head, 4J; depth, 7f. D. 1, 11, A. 1, 16, P. 10, V. 5. Gulf Stream, in deep water oflf 

 south coast of New England, not rare. 



(Goode i& Bean, Bull. Mus. Comp. Zool. 1882, 221.) 



2 Sigmops Gill. 



(Gill, Proc. U. S. Nat. Mus., 1883, 256; type Sigmops stigmaticus Gill.) 

 No scales or pseudobranchiie ; body elongate, clavifoi-m ; dorsal short ; anal long, 

 the insertions of the two fins opposite each other; teeth moderately elongate, alter- 



