6i 



small, sharp tubercles on much of the inner side and especially on the major distal part of its 

 convex margin (figs. 2/1 and 22); before the end this chitinized part is somewhat narrow, and 

 the end itself is obliquely and distinctly expanded. The processus ventralis is somewhat flattened, 

 narrower at the base and broader towards the end which is somewhat incised and adorned with 

 a consequently bipartite brush of numerous short chitinous threads. The brush is frequently easy 

 to see without preparation, and the brush together with the distinctly widened plate-shaped end 

 •of the sheath are excellent speciiïc characters. — The protuberance (fig. 2g, pi) on the front 

 margin of the pleopod is oblong as in the preceding forms. 



Length of a male 9.5 mm., of a female 10.8 mm. 



Remarks. — The male can always be determined with certainty. Most frequently the 

 shape of the end of the üropods is sufficiënt, but in some specimens this end is not very 

 different from the shape sometimes found in L. intermedius or, rarely, L. Hanseni, and in such 

 cases an inspection of the shape of the petasma will instantly decide the question. But in some 

 cases I have found it impossible to decide whether a female belonged to L. penicillifer. 



Distribu tion. — L. penicillifer is extremely common in the "Siboga" area, as it 

 has been taken at more than forty stations, in reality in the majority of the Plankton samples 

 containing specimens of the genus. And at a number of stations from a hundred to a thousand 

 specimens were taken, probably in the same haul. The Copenhagen Museum possesses specimens 

 from the Bay of Bengal ("Galathea" Exped.); at lat. 4°2o'N., long. io7°2o'E. (Capt. Andréa); 

 lat. i5°i4'X., long. n8°E. ("Galathea"); Formosa Strait ("Galathea"); Manilla ("Galathea"); 

 Ghinese Sea, Hongkong- — Shanghai ("Galathea"), and Gulf of Yeddo ("Galathea"). 



5. Lucifer Faxonii Borrad. PI. V, figs. 2> a — 3*'- 



1878. Lucifer typtest Faxon, Stud. Biol. Lab. Johns Hopkins Univ. 3, p. 113, PI. VII, [teste 



Borradaile]. 

 1882. Lucifer sp. Brooks, Phil. Trans. Roy. Soc. London, Vol. 173, I, p. Sj, Pis. 7 — 9, figs. 61 — 75. 

 1915. Lucifer faxoni Borradaile, Ann. Mag. Nat. Hist. Ser. 8, Vol. XVI, p. 228. 



Stat. 66. May 7 — 8. Bank betvveen Bahuluwang and Tambolungan, South of Saleyer. S — 10 m. 

 Plankton. 12 specimens. 



Stat. 98—99. June 28—30. Lat. 6° 9'— 6°/.$ N., long. I20°2i' — I20°26'E. Tovvnet. 14 spe- 

 cimens. 



Stat. 117a. July 12. Lat. i°I5'N., long. 123° 37' E. Townet. 2 specimens. 



Stat. 125. July 18 — 19. Anchorage off Sawan, Siau-island. 27 m. 4 specimens. 



Stat. 136. July 29 — Aug. 3. Ternate anchorage. 23 m. Tovvnet. 1 specimen. 



Stat. 13S. Aug. 3. Anchorage on the east coast of Kajoa-island. 66 m. Townet. Large number 

 of specimens. 



Stat. 140. Aug. 4 — 5. Bay of Batjan. 13 m. Townet. 2 specimens. 



Stat. 144. Aug. 7 — 9. Anchorage North of Salomakiëe-(Damar-)island. 45 m. Tovvnet. n spe- 

 cimens. 



Stat. i77 a . Sept. 1. Lat. 2°3o'S., long. I29°28'E. Tovvnet. 15 specimens. 



Stat. 184. Sept. 11 — 12. Anchorage off Kampong Kelang, South coast of Manipa-island. 36 m. 

 Townet. 8 specimens. 



Stat. 1S5. Sept. 12. Lat. 3° 20' S., long. I27°22'.9E. HENSEN vertical net, from 1536 m. depth 

 to surface. 1 specimen. 



Stat. 189». Sept. 12. Lat. 2°22'S., long. i26°46'E. Townet. 2 specimens. 



