MYCTOPIIUM LATERNATUM. 267 



adipose dorsal to the caudal. Pectorals short, reaching nearly half way to 

 the anal. Scales smooth, those of the lateral line enlarged. The lanterns 

 are as figured on Plate LVl., fig. 3; there are no luminous bodies on the 

 top of the caudal region. 



Lustrous brownish on the back ; bluish on the upper portions of the 

 sides, shading to lighter below; light colored about the nasal sacs and on 

 the interorbital space. 



Latitude. Longitude, 



27° 50' N 145° 45' 30" "W. 



Myctophum laternatum sp. n. 



Plate L VI. Jig. 1. 



D. 11 (11-12) ; A. 16 (16-15) ; V. 8; 



Somewhat stout and short, compressed, depth about one fourth of the 

 total length. Head deep, nearly one third of the lengtli from the snout to 

 the ba.se of the caudah Snout very blunt, deep, short, about one fourth 

 as long as the eye, profile nearly vertical in front, a median internarial 

 ridge. Eye large, one third of the length of the head, one and one half 

 times as wide as the interorbital space, four times as long as the snout. 

 Mouth wide ; maxillary extending little behind the orbit. Opercles broad, 

 thin. 



Dorsal origin near midway from snout to base of caudal. Anal origin 

 below the hindmost rays of the dorsal. Adipo.se fin above the posterior half 

 of the anal. Yentrals little backward of midway from the bases of the 

 pectorals to the origin of the dor.-^al. Pectorals reaching behind the bases 

 of the ventrals. Caudal forked. 



The lanterns are di.sposed somewliat as follows : one on the middle of 

 the interorbital space ; three in each branchiostegal series, the anterior 

 being particularly distinct below the chin ; a small one at the hind end of 

 the maxillary, and a larger one above it backward from the lower portion 

 of the orbit; one on the lower part of the base of the pectoral, another 

 above this at the margin of the opercle, and a third below and forward at 

 the opercular edge ; five in the series from the isthmus to the ba.se of the 

 ventral ; a single one above the base of the ventral half way to the lateral 

 line ; four in the series from the ventrals to the anal ; three in a series from 

 the vent up and backward to the lateral line ; behind the vent at the side 



