242 DEEP SEA FISHES. 



On the body the structure of the light organs differs to some extent 

 from that obtaining on the caudal region. On the latter, single ones, those 

 not in groups, may be described as vertically oblong black areas in the 

 middle of each of which a circular yellow pupil is situated ; the groups are 

 similar, but the black spot is larger and includes a row of several pupils. 

 On the body the organs have the appearance of vertically subelliptical or 

 oblong whitish or bluish translucent areas, the upper end of each of which 

 contains the yellow organ. Tlie structure approaches that of the same 

 organs on Argyropidecus and Polyipnus. The number of the organs is one 

 hundred and twenty-two (one hundred and twenty-four if the nasal spots 

 are included) ; they are arranged as follows : six in each branchiostegal 

 series, three plus four on each side of the isthmus to the shoulder, seven 

 behind the shoulder to a point above the vent, eleven between the isthmus 

 and the vent, a group of five on each side above the vent, and on each side 

 of the caudal region a group of three above the anterior raj-s of the anal 

 followed by a row of sixteen, one to each muscle band, the hindmost lying 

 at the end of the base of the anal, followed at the short rays of the caudal by 

 a group of four which in turn is followed by a single one. The round spot 

 of black below the nostrils in front of the eye lacks the yellow centrum. 



Snout whitish, belly and remainder of the head blackish, muscular 

 portions flesh color (from dermal abrasion), fins light yellowish. 



Maurolicus lucetius sp. n. 



Plate J, fig. 2. 



Br. r. 9; D. 14; A. 15; V. 7; P. 9. 



The form of this species is about as much elongate and compressed as 

 that of M. attenuatus. The depth is one sixth and the width one ninth of 

 the total length. Head compressed, length one and three fourths times its 

 depth, or nearly one fourth of the total length, slightly concave between the 

 eyes, vertical on the cheeks; chin rising forward. Snout pointed, as long 

 as the eye, end formed by the lower jaws, which are longer than the upper 

 and in which the symphyseal angle is prominent. Eye large, two sevenths 

 of the length of the head, twice as wide as the interorbital space. Mouth 

 wide ; maxilla rios tooth bearing, broad, making a wide and regular curve 



