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separated by the presence of a fringe of small spines on the distal end of die first, second 

 and third abdominal segments. 



The known distribution of this species appears to be very limited. It has been recorded 

 from the Pacific by Giesbrecht, and from the Red Sea by Cleve. 



2. Lubbockia squillimana Clans. 



Lubbockia squillimana Claus, 1863, p. 164, pi. XXV, figs. 1 — 5. 



Lubbockia squillimana Brady, 1883, p. 118, pis. LUI & LIV. 



Lubbockia squillimana Giesbrecht, 1893, p. 606, pis. 4 & 48. 



Lubbockia squillimana T. Scott, 1893. p. 115. 



Lubbockia squillimana A. Scott, 1902. p. 419. 



Lubbockia squillimana Thompson & Scott, [903, p. 285. 



Lubbockia squillimana Wolfenden, 1905 (a), p. 1030. 



This species appeared to be very rare in the area investigated by the 'Siboga'. One 

 specimen was obtained from the plankton collected at each of the following four stations. 



Stat. 118 (HENSEN vertical net, 900 metres to surface). — Stat. [28 (HENSEN vertical net. 

 700 metres to surface). — Stat. 143 (HENSEN vertical net, 1000 metres to surface). -- Sta. 315, 



Lubbockia squillimana can be distingnished by the absence of small spines on the distal 

 end of the first, second and third abdominal segments. 



This Lubbockia has been recorded from the Atlantic, Indian and Pacific Oceans, and 

 from the Mediteranean. 



42. Family Corvcaeidae. 

 Genus Corycaeus Dana, 1846. 



The members of this genus are readily recognised by their elongate and sub-cylindrical 

 body, by the one or two-jointed abdomen, and by the presence of a pair of comparatively 

 large eye-lenses on the frontal margin of the cephalic segment. 



Sixteen species belonging to this genus were represented in the plankton collected by 

 the 'Siboga' during the investigations in the Malay Archipelago. 



1 . Corvcaeus alatus Giesbrecht. 



Corycaeus alatus Giesbrecht, 1891, p. 480. 

 Corvcaeus alatus Giesbrecht, 1893, p. 661, pi. 51. 

 Corycaeus alatus I. C. Thompson, 1900, p. 292. 



Twenty specimens were found in the plankton collected at the following three stations. 



Stat. 66, 8 specimens. — Station 128 (Hexsex vertical net, 700 metres to surface, 6 speci- 

 mens. — Stat. 217 (horizontal cylinderi, 9 specimens. 



Corycaeus alatus can be clistinguished from the other members of the genus by the 



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