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1. Conaea gracilis (Dana). 
Antaria gracilis Dana, 1852, p. 1229, pl. 86. 
Conaea rapax Giesbrecht, 1891, p. 477. 
Conaea rapax Giesbrecht, 1893, p. 605, pls. 5 & 48. 
Oncaea gracilis T. Scott, 1893, p. 116, pl. XIII, figs. 4—12. 
Conaea rapax 1. C. Thompson, 1903, p. 34. 
Conaea rapax Cleve, 1904, p. 188. 
Conaea rapax FKarran, 1905, p. 47. 
Conaea rapax Pearson, 1906, p. 35. 
Conaea rapax Farran, 1908, p. 96. 
Conaea rapax van Breemen, 1908, p. 192, fig. 206. 
Fifteen specimens of this species were found in the plankton collected at nine stations. 
Stat. 118 (HENSEN vertical net, goo metres to surface), 2 specimens. — Stat. 128 (HENSEN 
vertical net, 700 metres to surface), I specimen. — Stat. 141 HENSEN vertical net, 1500 
metres to surface), 2 specimens. — Stat. 143 (HENSEN vertical net, 1000 metres to surface), 
5 specimens. — Stat. 185 (HENSEN vertical net, 1536 metres to surface), I specimen. — Stat: 
203 (HENSEN vertical net, 1500 metres to surface), I specimen. — Stat. 230 (HENSEN vertical 
net, 2000 metres to surface), I specimen. — Stat. 276 (HENSEN vertical net, 750 metres to 
surface), I specimen. 
Conaea gracilis can readily be recognised by its general appearance, by the long third 
joint of the antennules, and by the armature of long slender curved spines on the apical joint 
of the antennae. 
GIESBRECHT’S Conaca rapax appears to be identical with Axfarza gracilis Dana. 
This species has been recorded from various parts of the Atlantic and Pacific Oceans. 
Genus LubbockKia Claus, 1863. 
The members of this genus are readily recognised by the elongate pyriform body and 
by the long slender abdomen. The fifth pair of feet is moderately prominent and the terminal 
spines are usually lamelliform. 
Two species were represented in the plankton collected by the ‘Siboga’. 
1. Lubbockia aculeata Giesbrecht. 
Lubbockia aculeata Giesbrecht, 1891, p. 417. 
Lubbockia aculeata Giesbrecht, 1893, p. 606, pl. 48. 
Lubbockia aculeata Cleve, 1903, p. 364. 
Specimens identical with the above species were obtained from the plankton collected 
at the following stations. 
Stat. 35, 2 specimens. — Stat. 118 (HENSEN vertical net, g00 metres to surface), 3 speci- 
mens. — Stat. 141 (HENSEN vertical net, 1500 metres to surface), 6 specimens. — Stat. 
‘143 (HENSEN vertical net, 1000 metres to surface), 3 specimens. — Stat. 203 (HENSEN 
vertical net, 1500 metres to surface), I specimen. 
Lubbockia aculeata is closely related to Ludbbockia sguillimana, but the female can be 
PB 
