MYCTOPHUM OCULEUM. 261 



Mouth wide, two find two fifths tunes as long as the eye; intermaxillary 

 very slender, lorniing the entire upper edge of the mouth; maxillary 

 extending one diameter of the eye backward of the orbit. Opercles large, 

 elongate, membranous in the gresiter part of their extent. 



Dorsal origin half way from the snout to the base of the caudal. 

 Origin of the anal below the tenth ray of the dorsal. Adipose fin above the 

 hindmost rays of the anal. Ventrals little backward of midway from the 

 isthmus to the first ray of the anal. On one specimen the ventrals were 

 never developed. 



Scales large, smooth, those of the lateral line wider. 



Of the luminous organs, the lanterns, there is one on the interorbital 

 area immediately behind the rostral keel ; there are three in the branchios- 

 tegal series the iiindniost being lower than the other two ; there is one 

 behind the end of the maxillar}-, below which at the angle of the mouth lies 

 a smaller one ; there is one upon the base of the pectoral, above and for- 

 ward on the lateral line anotlier. and below and forward from the pectoral 

 a third ; on the lateral line the second of its series lies above and backward 

 from the ventral base, the third above the fifth ray of the anal, the fourth 

 above the hinder extremity of the base of the anal, and the fifth a little 

 above the median line on the base of the caudal ; there are four between 

 the isthmus and the ventrals, of -which the third is farther out than the 

 others; from the ventrals to the anal there are three ; at the side of tlie 

 anal there are five or six, the hindmost one being farther out; at the lower 

 part of the side of the caudal pedicel there are eight, the last situated x'p a 

 short distance on the caudal base ; behind the end of the operculum half 

 way to the ventrals there is a single lantern ; and above the axil of the 

 ventrals on the lower part of the side lies the foremost of a series of five 

 of which the fourth is near the first, and the fifth near the next to the hind- 

 most ray of the anal. A large elongate organ apparently luminous extends 

 from the adipose fin to the caudal and a longer one from the base of the 

 anal backward to tlie tail. 



Black ; fins lighter ; scales lustrous. 



