THE LANTERN FISHES. 235 



nearly midway between latter and second precaudal. We do not follow 

 Brauer in counting the two anterior precaudals with the postero-anals in 

 cases like the present in which no gap separates the two series. According 

 to Brauer, such an interval may or may not occur in different individuals of 

 L. iiiacroptenis. In both specimens, the luminous scales are four in number 

 on back of caudal peduncle and nine below, the most anterior of the lower 

 luminous scales being under the interspace between second and third 

 postero-anals (not imder fifth postero-anal as in L. macrojiierus). 



The general color was evidently dark, blackish on opercles and at bases 

 of fins. Vertical fins with fine wavy lines, due to pigment along the 

 lines of articulation of the rays. 



A second specimen, here designated as co-type, of equal length and 

 from the same locality. 



Lampanyctus stilbius, sp. nov. 



Plate 6. 



Type 20 mm. long from Hydrographic Station 3798 (A. A. 27), near 

 Nukuhiva Island, Marquesas Group, taken in open intermediate net be- 

 tween the surface and a depth of 300 fathoms. 



Near L. guentheri, differing in the presence of photophores on the cheeks 

 and in having numerous minute scattered photopliores on head and body, 

 in having 4 instead of 5 ventral photophores, and in a number of details 

 in arrangement of thoracic, ventral, anal, and supra-anal photophores ; the 

 eye is also larger. It is still more closely allied to L. hngipes Brauer (Die 

 Tiefseefische, 1906, p. 236, text-fig. 155), but has the preocular on the ven- 

 tral instead of the dorsal side of the nostril. 



Measurements in hundredths of total length without caudal : length of 

 head 36 ; diameter of eye 13 ; axial length of snout G ; length of maxillary 

 23 ; greatest depth of body 22; depth of caudal peduncle 9; distance from 

 snout to dorsal 51 ; to ventral 52 ; to anal 58. 



Dorsal 11; anal 13; pectoral 15; lateral line about 38. Snout short 

 but not bluntly rounded ; eye very large, more than one-third length of 

 head ; maxillary moderately widened posteriorly, extending beyond eye a 

 distance not much exceeding half its diameter; body slender. 



