IOI 



upper keel on third antennular joint, seen horizontally from the outer side (fig. 6 a), reaches 

 proximally a little nearer to the end of the second joint and decreases gradually towards the 

 base. Dorsal process on third abdominal segment (fig. 6 b) as to shape and length completely 

 as in E. pscudogibba, while the sixth segment is shaped as in E. hemigibba. The anal spines 

 in both sexes and the relative length of the rami of the uropods and the telson as in the 

 preceding species. 



The copulatory organs (figs. 6 c and 6d) differ from those in the preceding species by 

 the shape of the distal part of the proximal process, by the outline of the median lobe and 

 the presence of dorsal teeth on the lateral process. The terminal process is rather similar to 

 that in E. hemigibba, with a similar foot and rather long heel, but it differs in having the part 

 bevond the distal, lateral, spiniform tooth still a little longer, not compressed, gradually tapering 

 and somewhat curved towards the end. The proximal process overreaches a little the terminal 

 one ; it is somewhat curved at the middle, its distal half tapers gradually to the acute end, and 

 a short terminal part is not inconsiderably curved. The proximal major part of the median lobe 

 is broad, from the middle much and obliquely tapering to the base of the distal part, which is 

 stiff, narrow, shaped essentially as in E. pseudogibba, but with the terminal part a little more 

 expanded, obliquely oval, not reaching beyond the end of the setiferous lobe; the lateral process, 

 which is situated on the posterior surface of the broad part a little from the inner margin, is 

 about semicircularly curved with the proximal half thick and the distal slender, the process 

 becoming suddenly slender at the middle, where its outer margin is deflexed and bears three 

 oblong, acute teeth (fig. 6d). 



Length 14 — 17 mm. 



Remarks. — It may be pointed out that in no other species of the gibba-group the 

 proximal process has the shape described or the lateral process any tooth. 



Distribution. — I have seen specimens from the Pacific, but not from the Atlantic. 



12. Eupkausia Sibogce H. J. H. PI. XIV, figs. ja — 7 d. 



1908. Euphausia Siboga; H. J. Hansen, in M. Bedot & C. Pictet, Voyage scientifique dans 

 1'Archipel Malais, Vol. II, p. 244. 



Stat. 35. March 28. Lat. 8°o'.3S., long. ii6°5q'E. 1310 m. Surface. 1 specimen. 



Stat. 66. May 7/8. Bank between islands of Bahuluwang and Tambolungan, South of Saleyer. 



8 — 10 m. Enormous quantity of specimens, both adults and half-grovvn. 

 Stat. 106. July 4. Anchorage off Kapul-island, Sulu-Archipelago. 13 m. Townet. 4 small specimens. 

 Stat. 141. August 5. Lat. i°o'.4S., long. I27°25'.3E. 4950 m. HENSEN vertical net, from 



1 500 m. to surface. 12 specimens, of various size. 

 Stat. 143. August 7. Lat. i°4'.5 S., long. i27°52.6E. 1454 m. Hensen vertical net, from 



1000 m. to surface. 3 specimens. 

 Stat. 144. August 79. Anchorage North of Salomakiëe-(Damar-)island. 45 m. Townet. 1 specimen. 

 Stat. 165. August 20/22. Anchorage on North-side of Daram-island (False Pisangs), East-coast 



of Misool. 49 m. Townet, surface. 14 larvae. 

 Stat. 169. August 2325. Anchorage off Atjatuning, West-coast of New-Guinea. 57 m. Townet, 



surface. About 40 larvae. 

 Stat. 184. September u/12. Anchorage off Kampong Kelang, South-coast of Manipa-island, 



36 m. Townet, surface. 2 larvse. 



