134 
ward to Sandwich islands. Indic: tropical part to New Amster- 
dam. Atlantic: between 46° 24’ N. to Cape of Good Hope and 
West India. 
3. Argyropelecus Cocco. 
(Cocco, Giorn. Sci. Sicil. 1829. fasc. 77. p. 146). 
Strongly compressed, short, anterior part of body much 
elevated and higher than posterior part, which is more or less 
sharply deflected from the anterior, its contour carinated; espe- 
cially a short ventral edge with an anterior and 2 posterior 
spines. Cleft of mouth subvertical, its upper margin constituted 
by the intermaxillary and by the curved maxillary, which 
enclose the mandible, which has a prominent hook at the 
symphysis and at the posterior inferior angle. Praeoperculum 
ventrally with one or two spines. Large telescopic eyes, situated 
close together. No scales. Luminous organs: on head before 
and below eyes, on operculum and in a group on branchiostegal 
membranes. A ventral and a lateral series on trunk, 3 groups 
on tail. Anterior 7—9 rays of dorsal transformed into a folia- 
ceous, serrated plate, succeeded by 7—g normal rays, which 
originate before anal. Anal divided nearly in the middle by 
a free interspace. A low long adipose fin in the middle between 
dorsal and caudal. Pectorals long and low. Ventrals very small. 
Caudal deeply emarginated. Upper jaw with minute teeth, lower 
jaw and palatines with a series of small curved teeth. Gillopening 
wide, gillmembranes free from isthmus and from each other. 
4 gills. Pseudobranchiae present. Gillrakers long; 9 branchios- 
tegals. 
Probably bathypelagic fishes. 
1. Argyropelecus olfersi (Cuv.). 
Sternoptyx Olfersii Cuvier, Regne animal, 2. ed. II. 1829, p. 316. 
Argyropelecus Olfersii Cuvier & Valenciennes, Hist. Nat. Poiss. XXII. 1849, p. 408. 
Argyropelecus Olfersi Brauer, Deutsche Tiefsee-Exp. Tiefseefische, 1906, p. 108. 
Argyropelecus Olferst Zugmayer, Camp. Scient. Monaco, XXXV. IQII, p. 52. 
Argyropelecus Olfersi Max Weber, Siboga-Exp. Fische, 1913, p. 21. 
B.9; D. VII4-9; A. VII+5; P. 1o—11; V.6. 
Greatest height about 1°/;, length of posterior part of body 
to that of anterior as 1:1.4-1.7. Head 3-3'/,. Telescopic eye 2'/, 
to 3, nearly vertical, '/; to about '/, longer than snout. Gape of 
