249) 
Corycacus gibbulus although not common, appeared to be well distributed in the area 
investigated by the ‘Siboga’. It was present in the plankton collected at the following stations. 
Stat. 35. — Stat. 36. — Stat. 50. — Stat. 71. — Stat. 75 (HENSEN vertical net, 11 metres 
to surface). — Stat. 96 (day). — Stat. 96 (night). — Stat. 99. — Stat. 128 (HENSEN vertical 
net, 700 metres to surface). — Stat. 142. — Stat. 148 (HENSEN vertical net, 1000 metres 
to surface). — Stat. 184. — Stat. 186. — Stat. 203 (HENSEN vertical net, 1500 metres to 
surface). — Stat. 213. — Stat. 216. — Stat. 217 (horizontal cylinder). — Stat. 220 (HENSEN 
vertical net, 200 metres to surface). — Stat. 225. — Stat. 229. — Stat. 276 (HENSEN 
vertical net, 750 metres to surface). — Stat. 304. — Stat. 315. 
The abdomen is composed of two segments. Seen from above, the second segment 
appears moderately large and funnel-shaped, with the wide end in front. The furcal joints are 
moderately short and stout. The joints are rather shorter than the anal segment. : 
This Corycaews has been recorded from various parts of the Indian Ocean, and also 
from the Pacific. 
9. Corycaeus gractlicaudatus Giesbrecht. 
Corycaeus gracilicaudatus Giesbrecht, 1891, p. 481. 
Corycaeus gracilicaudatus Giesbrecht, 1893, p. 661, pl. 51. 
Corycaeus gracilicaudatus Cleve, 1901, p. 6. 
Corycaeus gracilicaudatus A. Scott, 1902, p. 421. 
Corycacus gractlicaudatus Thompson & Scott, 1903, p. 286. 
Coryeaeus gracilicaudatus Cleve, 1903, p. 361. 
Corycaeus gracilicaudatus Wolfenden, 1905(@), p. 1029. 
This species appeared to be rather scarce in the area investigated by the ‘Siboga’. It 
was only observed in the plankton collected at three stations. 
Stat. 142. — Stat. 143 (HENSEN vertical net, 1000 metres to surface). — Stat. 304. 
The abdomen of the female is moderately short and rather slender. It is composed 
of two segments. The genital segment is somewhat inflated in the middle. The second seg- 
ment is narrow and cylindrical. The furcal joints are comparatively long and slender, and are 
slightly longer than the anal segment. 
Corycaeus gractlicaudatus has been recorded from various parts of the Indian Ocean 
and from the Pacific. 
10. Corycaeus longistylis Dana. 
Corycaeus longistylis Dana, 1849, pp. 8—6l. 
Corycaeus longistylis Dana, 1852, p. 1212, pl. 85. 
Corycaeus longistylis Giesbrecht, 1893, p. 661, pl. 51. 
Corycaeus longistylis 1. C. Thompson, 1900, p. 293. 
Corycaeus longistylis Cleve, 1901, p. 6. 
Corycaeus longstylis Thompson & Scott, 1903, p. 286. 
Corycaeus longistylis Wolfenden, 1905 (a), p. 1026. 
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