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i. Conaea gracilis (Dana). 



Antaria gracilis Dana, 1852, p. 1229, pi. 86. 



Conaea rapax Giesbrecht, 1891, p. 477. 



Conaea rapax Giesbrecht, 1893, p. 605, pis. 5 & 48. 



Oncaea gracilis T. Scott, 1893, p. 116, pi. XIII, figs. 4 — 12. 



Conaea rapax I. C. Thompson, 1903, p. 34. 



Conaea rapax Cleve, 1904, p. 188. 



Conaea rapax Farran, 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, 900 metres to surface), 2 specimens. — Stat. 128 (HENSEN 

 vertical net, 700 metres to surface), 1 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), 1 specimen. — Stat. 

 203 (HENSEN vertical net, 1500 metres to surface), 1 specimen. — Stat. 230 (HENSEN vertical 

 net, 2000 metres to surface), 1 specimen. - - Stat. 276 (HENSEN vertical net, 750 metres to 

 surface), 1 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 Conaea rapax appears to be identical with Antaria gracilis Dana. 



This species has been recorded from various parts of the Atlantic and Pacific Oceans. 



Genus Lubbockia 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, pi. 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. 1 18 (HENSEN vertical net, 900 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), 1 specimen. 



Lubbockia aculeata is closely related to Lubbockia squillimaua, but the female can be 



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