THE LANTEKN FISHES. 233 



1. The first anal ray is vertically below the next to the last dorsal ray 

 instead of the middle of the dorsal fin ; 



2. The supra-pectoral, supra-ventrul, and the fourth thoracic photophores 

 are less elevated ; 



3. The middle pectoral photophore is opposite the upper instead of the 

 middle pectoral rays; 



4. The second ventral photophore is in advance of the first instead of 

 behind it ; 



5. The upper and middle supra-anals are more anteriorly placed and the 

 lower one is more depressed ; 



6. Interspaces between antero-anals (excepting between first and second 

 pairs) not noticeably greater than between postero-anals. 



Measurements in hundredths of total length without caudal : length of 

 head 32 ; diameter of eye 7.5 ; axial length of snout 4 ; length of maxil- 

 lary 21; greatest depth of body 21; least depth of caudal peduncle 10; 

 distance from snout to front of dorsal 47 ; length of base of dorsal 16 ; 

 distance from snout to adipose dorsal 79 ; to insertion of ventrals 44 ; to 

 front of anal 60 ; length of base of anal 21 ; length of longest gill-raker 5. 



Dorsal 14; anal 18; pectoral 13; ventral 9 ; lateral line 39; gill-rakers 

 5 + 12. Snout short but not rounded, the upper profile not descending 

 more steeply in front ; the snout much shorter than in L. macropterus ; 

 little more than half diameter of orbit. Maxillary little widened pos- 

 teriorly, nearly reaching margin of preopercle, extending beyond the eye 

 a distance about equaling the diameter of the latter. 



Fins somewhat mutilated, both pectorals and ventrals evidently extend- 

 ing beyond origin of anal; origin of ventrals in advance of dorsal; anal 

 originating under the next to last ray of dorsal, the adipose fin over the 

 last two anal rays. In L. macroptenis, the origin of the anal is under the 

 middle of the dorsal fin, a character which Dr. Brauer has kindly verified 

 for me on the types of L. macropteriis. 



A minute preorbital photophore surrounded with much black pigment 

 between the eye and the lower portion of nostril. Humeral photophore 

 present, as in L. macroptenis. Supra-pectoral almost in a direct line joining 

 the lower two pectorals, its distance from lateral line two-thirds its distance 



