98 MEMOIRS OF THE CARNEGIE MUSEUM 



more elevated. Antero-anals normally 6 in number, the postero-anals 5; in one 

 cotype the number is 7 + 4. Posterolateral immediately below lateral line, 

 scarcely in contact with it. Precaudals in a gentle obliquely disposed curve, 

 the first two more closely set than are the postero-anals, the last two a little 

 more widely spaced; fourth precaudal well below end of lateral line. 



Five cotypes from the same locality as the type (C. M. No. 4609), and one 

 from Albatross Station 5064, Suruga Bay, taken with open intermediate net at 

 300 fathoms. 



Type deposited in the Carnegie Museum. 



Genus Lampanyctus Cocco. 



Key to Japanese Species op Lampanyctus. 

 a. Luminous scales not confined to the precaudal region. 



6. Dorsal and anal short, about equal in length. Only one photophore above the base of 



pectoral fin. Supra-anals in an obhque line L. townsendi. 



hh. Dorsal and anal long, much overlapping, the dorsal the longest. Two pectoral photophores 

 above the base of the pectoral fin. Supra-anals angulated. Two posterolaterals, on a 



level L. japonicus. 



aa. Luminous scales confined to precaudal patches, or with one in addition in front of adipose fin. 



c. Supra-anals in an oblique line L. leucopsarum. 



cc. Supra-anals angulated. 



d. Pectorals short, not reaching base of ventrals. 



e. Last precaudal vertically above the one preceding L. niger. 



ee. Last precaudal above and behind the preceding L. microchir. 



dd. Pectorals longer, extending well beyond base of ventrals. 



/. A spot on the cheek and one on shoulder. Numerous accessory dots 

 scattered over head and bod3\ 



g. Second and third antero-anals not elevated L. punctatissimus. 



gg. Second and third antero-anals elevated, on the same level. L.jordani. 

 //. A spot on the shoulder, none on the cheek L. macropterus. 



24. Lampanyctus townsendi Eigenmann and Eigenmann. 

 Lampanyctus townsendi Eigenmann and Eigenmann, West American Scientist, 



1889, p. 125, from Cortez Banks, near San Diego, Cal. Gilbert, Mem. 



Mus. Comp. Zool., XXVI, 1908, p. 230, PI. 4. (Marquesas Islands, Pacific 



Ocean.) 



Three specimens, the largest 60 mm. long, taken off southern Japan. In 

 life the species is almost jet-black, and probably lives at a considerable depth. 

 One of the specimens was taken in a bottom trawl at 507 fathoms; the other 

 two in an intermediate net operated at 850 fathoms. In both cases, they may 

 of course have entered the net nearer the surface. 



