248 
Corycaeus flaccus Thompson & Scott, 1903, p. 285. 
Corycaeus flaccus Cleve, 1903, p. 361. 
Fourteen specimens of the above species were obtained from the plankton collected 
with the HENSEN vertical net at the following three stations. 
Stat. 128 (700 metres to surface), 6 specimens. — Stat. 203 (1500 metres to surface), 3 spe- 
cimens. — Stat. 276 (750 metres to surface), 5 specimens. 
Corycacus flaccus resembles Corycaeus alatus in general appearance. The abdomen is 
composed of two segments. The genital segment is considerably inflated and the distal end 
of the dorsal surface is produced in the middle line into a short blunt tooth-like process. The 
fureal joints are moderately long and slender, and are about two and a half times longer 
than the anal segment. The proximal end of the joints is swollen. 
This species has been recorded from the Atlantic, Indian and Pacific Oceans, and from 
the Mediterranean. 
7. Corycaecus furcifer Claus. 
Corycaeus furcifer Claus, 1863, p. 157, pl. XXIV, figs. 7—12. 
Corycaeus furcifer Giesbrecht, 1893, p. 660, pls. 49 & 51. 
Corycaeus fnrcifer 1. C. Thompson, 1900, p. 291. 
Corycaeus furcifer Cleve, 1901, p. 6. 
Corycaeus furcifer A. Scott, 1902, p. 421. 
Corycaeus furcifer Thompson & Scott, 1903, p. 285. 
Corycaeus furcifer Cleve, 1904, p. 188. 
This species appeared to be moderately frequent and fairly well distributed in the area 
investigated by the ‘Siboga’. It was found in the plankton collected at the following stations. 
Stat. 50. — Stat. 98. — Stat. 118 (HENSEN vertical net, 900 metres to surface). — Stat. 128 
(HENSEN vertical net, 700 metres to surface). — Stat. 129. — Stat. 133. — Stat. 141 (HENSEN 
vertical net, 1500 metres to surface). — Stat. 144. — Stat. 157. — Stat. 165. — Stats. 
194—7. — Stat. 203 (HENSEN vertical net, 1500 metres to surface). — Stat. 214. — Stat. 
217. — Stat. 217 (horizontal cylinder). — Stat. 220 (HENSEN vertical net, 200 metres to 
surface). — Stat. 223. — Stat. 224. — Stat. 225. — Stat. 276 (HENSEN vertical net, 750 
metres to surface). — Stat. 282. 
The abdomen of the female of Corycaeus furcifer is composed of two segments. The 
furcal joints are long and slender, and are nearly twice as long as the abdomen. 
This Corycaews has been recorded from the Atlantic, Indian and Pacific Oceans, and 
from the Mediterranean. 
8. Corycaeus gibbulus Giesbrecht. 
Corycaeus gibbulus Giesbrecht, 1891, p. 481. 
Corycaéus gibbulus Giesbrecht, 1893, p. 660, pl. 51, 
Corycaeus gibbulus 1. C. Thompson, 1900, p. 293. 
Corycaeus gibbulus Cleve, 1901, p. 6. 
Corycaeus gibbulus A. Scott, 1902, p. 420. 
Corycaeus gibbulus Thompson & Scott, 1903, p. 286. 
Corycaeus gibbulus Cleve, 1903, p. 361. 
Corycaeus gibbulus \Wolfenden, 1905 (a), p. 1028. 
248 
