135 



mouth nearly vertical, nearly reaching the vertical through the 

 middle of the eye. Mandible with a prominent spine at the sym- 

 physis and a short flat one at its posterior corner. One praeoper- 

 cular spine directed downward. One spine at the shoulder. Ventral 

 keel with a short anterior and two much stronger posterior ones, 



Fig. 49. Argyropehcus olfersi Cuv. 



which are directed down- and backward. Soft part of dorsal 

 before the beginning of the second */ 3 of the length, ending 

 before the vertical through the origin of the anal, which origin- 

 ates immediately behind the anus, in the beginning of the last 

 Y 3 . Origin of ventrals below the middle of the second ! / 2 of 

 dorsal, behind middle of length. Pectorals reaching ventrals. 

 A long low adipose fin. Caudal deeply emarginate. Luminous 

 organs : an antorbital below nostrils, a suborbital near posterior 

 end of maxillary. Two operculars, the dorsal nearly on the 

 level of the ventral margin of the eye, the inferior behind prae- 

 opercular spine. A group of 6 on the branchiostegal membrane. 

 In the ventral series meeting that of the other side, a group 

 of 6 behind the isthmus, along the ventral edge a series of 12 

 meeting those of the other side. Between ventrals and caudal, 

 on each side 3 far distant groups, the first group before anal 

 with 4 organs, the 2 median of which are shorter. Second group 

 above the middle of the anal with 5 6 organs of unequal size, 

 the middle ones of which are somewhat shorter. In the third 

 group before the anterior rays of caudal 4 nearly equal organs. 

 A group of 2 organs above pectorals and a series of 6 somewhat 

 distant organs between it and the ventral. Length about 100 mm. 



