53 



a. On the telson the posterior margin of the large ventral protuberance 

 is somewhat remote from the end of the telson, and the same is 

 the case with the distal pair of dorsal spines. The petasma has the 

 end rather broad and obtuse, at most with a rudimentary protuber- 

 ance ; the plate-shaped processus ventralis has the bottom of its deep 

 terminal incision transverse, and the sheath encloses besides a long- 

 stalked hook L. typus H. M.-Edw. 



i. On the telson the posterior margin of the' big ventral protuberance 

 is near the end of the telson, and the same is the case with the 

 distal pair of dorsal spines. The petasma is at its end proportionately 

 broad and produced into three triangular lobes; the plate-shaped 

 processus ventralis has the terminal incision extremely deep and 

 tapering to the acute end, and the sheath encloses no hook. . . L. orientalis n. sp. 



i. Lucifer typus H. M.-Edw. PI. IV, figs. 6a — 6k. 



1829. Lucifer J. Vaughan Thompson, Zool. Researches, IV, p. 58, PI. VII, fig. 2. 



1837. Leucifer typus H. Milne-Edwards, Hist. Nat. Crust. T. II, p. 469. 



1852. Lucifer acestra Dana, U. S. Expl. Exped. Crust. I, p. 671, PI. XLIV, figs. 9, a — i. 



[At least partim]. 

 1871. ? Lucifer Reynaudi Dohrn, Zeitschr. wiss. Zool. Bd. XXI, p. 357, Taf. XXVII, Fig. 1 — 10. 

 [882. Lucifer Reynaudii Bate, Challenger Rep., Zool., Vol. XXIV, p. 466, PI. LXXXTV. 



[At least partim]. 



Borradaile, in Ann. Mag. Nat. Hist. ser. 8, Vol. XVI, p. 227 — 230 (191 5), has the 

 following four names: L. typtis H. M.-Edw., L. acestra Dana, L. Clansi Borrad. and L. Batei 

 Borrad., all referring to figures of L. typus, while two of the authors quoted have in all 

 probability, judging from their lists of localities, mixed up specimens of L typus and L. orientalis. 



Stat. 128. July 22. Lat. 4 27' N.. long. I25°25'.7 E. 1645 m. Hensen vertical net, from 700 m. 



to surface. 16 specimens (cf and Q). 

 Stat. 129. July 22 — 23. Anchorage off Kawio- and Kamboling-islands, Karkaralong-group. 



23 — 31 m. 5 specimens ((ƒ and 9)- 

 Stat. 133. July 25. Anchorage off Lirung, Salibabu-island. Depth up to 36 m. 2 males (and 



females together with both sexes of L. orientalis). 

 Stat. 194. Sept. 15. Lat. i°53'.5S., long. i26°39'E. 1504 m. Townet. 5 specimens ((ƒ and Q)- 



Description. — The distance between labrum and the insertion of the eye-stalks is 

 abput one-seventh as long again as eye-stalks with eyes: the major part of these stalks is very 

 slender, and the large eyes conspicuously larger in the males than in the females. The anterior 

 ventral process on sixth abdominal segment in the male (fig. 6 a) is almost as long as the 

 posterior, slender, while the swollen distal part of the posterior process is bent considerably 

 upwards. In the male telson (fig. 6e and 6/) the ventral protuberance is directed downwards 

 and slightly or conspicuously forwards ; the lower margin behind the protuberance is more than 

 half as long as the protuberance itself, and the posterior pair of dorsal spines on the telson 

 are placed above or slightly beyond the posterior margin of the protuberance, so that these 

 spines are rather removed from the conspicuous outer pair of terminal spines. — The exopod 



