MYCTOPHIDAE 333 



the first; fourth and fifth level. 3 SAO, forming an almost vertical straight line, the 

 lowest close behind and a little above level of last VO; interspace between first and 

 second less than that between second and third; third SAO well below lateral line. 

 AO 5 + 5 ; first photophore of anterior series elevated, above level of second SAO ; 

 those of posterior series all level. Pol well below lateral line, about level with third 

 SAO. 4 Pre, more or less equally spaced and forming an even curve, the last distinctly 

 below lateral line. No luminous plates on upper or lower edges of caudal peduncle. 

 Uniform brownish black. 



Described from a single specimen, 36 mm. in length; holotype of the species. 



Hab. Middle Atlantic. 



This species appears to be very close to D. fulgens, Brauer, diff"ering chiefly in the 



form of the suborbital organs and the lower position of the PLO, VLO, ^AOg, Pol and 



Prc4 photophores. Mr Taning has studied two ,..-.. 



of Brauer's types of D. fulgens, respectively /^^^ 



ID and 22 mm. in length, but the larger example ^ — C"^ ^^^^_<^^__^^^^^> 



of 30 mm. is not in the collection of the Zoo- (T^\\ \ " -^^^ 



logical Museum at Berlin. He has kindly ^ "^^^^ 



examined the specimen described above, and ^^ ^^■ 



informs me that in his opinion this should 



, , , , , , . Fiff. -xo. Diaphus tuanitwi. Holotype. (x 1I-.) 



probably be regarded as a species new to 



science, but adds that the species of this particular group of Diaphus are very 



difficult to identify. He tells me that both the small types of D. fulgens have a 



small posterior suborbital organ, which is not shown in Brauer's figure of the 



species. 



Diaphus luetkeni (Brauer, 1904). 



Brauer, 1906, t.c. p. 221, figs. 141-142; Taning, t.c. p. 59; Parr, t.c. p. 118. 



St. 87. 25. vi. 26. 33° 53' 45" S, 9° 26' 30" E. Young-fish trawl, 1000 (-0) m. : i specimen, 45 mm. 



St. 257. 24. vi. 27. 35° 01' 00" S, 10° 18' 00" E. Young-fish trawl, 250 (-0) m. : 2 specimens, 

 31-35 mm. 



St. 281. 12. viii. 27. 00° 46' 00" S, 5° 49' 15" E. Young-fish trawl, 850-950 (-0) m. : i specimen, 

 42 mm. 



St. 284. 15. viii. 27. 2° 13' 00" S, 1° 52' 00" E. I m. tow-net, oblique, 71 (-0) m. : i specimen, 

 38 mm. 



St. 285. 16. viii. 27. 2° 43' 30" S, 00° 56' 30" W. 4J m. net, horizontal, 125-175 (-0) m. : 2 

 specimens, 40-45 mm. 



St. 288. 21. viii. 27. 00° 56' 00" S, 14° 08' 30" W. Young-fish trawl, 250 (-0) m. : 3 specimens, 

 33-45 mm. 



St. 289. 23-24. viii. 27. 3° 04' 45" N, 16° 52' 00" W. Young-fish trawl, 125-225 (-0) m. : 4 

 specimens, 34-43 mm. 70 cm. tow-net, oblique, 132 (-0) m. : i specimen, 18 mm. 



Hab. Atlantic and Indian Oceans. 



