134 



ward to Sandwich islands. Indie: 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 9 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. 



i. 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 Olfersi Zugmayer, Camp. Scient. Monaco, XXXV. 1911, p. 52. 

 Argyropelecus Olfersi Max Weber, Siboga-Exp. Fische, 1913, p. 21. 



B. 9; D. VII + 9; A. VII+5; P. 10 II; V. 6. 



Greatest height about i 3 / 5 , length of posterior part of body 

 to that of anterior as 1 : 1.4-1.7. Head 3-373- Telescopic eye 2'/ 5 

 to 3, nearly vertical, '/ 5 to about l / 3 longer than snout. Gape of 



