250 
Specimens belonging to this species were found in the plankton collected at the 
following stations. 
Stat. 36. — Stat. 66. — Stat. 71. — Stat. 1o1. — Stat. 112. — Stat. 121. — Stat. 125 
(night). — Stat. 128 (HENSEN vertical net, 700 metres to surface). — Stat. 133. — Stat. 
143 (HENSEN vertical net, 1000 metres to surface). — Stat. 148 (HENSEN vertical net, 1000 
metres to surface), — Stat. 271. — Stat. 276 (HENSEN vertical net, 750 metres to surface). 
Corycaeus longistylas resembles Corycaeus furcifer in general appearance. It can easily 
be distinguished from that species, however, by the abdomen being composed of a single 
segment, and by the rather shorter furcal joints. 
This Corycaews has been recorded from the Indian and Pacific Oceans. 
11. Corycaeus lubbockt Giesbrecht. 
Corycaeus lubbockt Giesbrecht, 1891, p. 481. 
Corycaeus lubbockt Giesbrecht, 1893, p. 660, pl. 51. 
Corycaeus lubbockt A. Scott, 1902, p. 421. 
Corycaeus lubbockt Thompson & Scott, 1903, p. 285. 
Corycaeus lubbockt Cleve, 1903, p. 3061. 
Corycaeus lubbockt appeared to be rather scarce in the Malay Archipelago. It was only 
observed in the plankton collected at the following five stations. 
Stat. 71. — Stat. 96 (night). — Stat. 213. — Stat. 271. — Stat. 315. 
This is a moderately slender form, with the abdomen composed of two segments. The 
genital segment is elongate ovate in shape. The second segment is short, narrow and cylindrical. 
The furcal joints are rather long and slender, and slightly divergent. The joints are about 
three times the length of the anal segment. 
Corycaeus lubbockt has been recorded from the Indian and Pacific Oceans, and from 
the) Red) Sea. 
1e2e Corycaeus obtusus Dana. 
Corycaeus obtusus Dana, 1849, pp. 8—61. 
Corycaeus obtusus Dana, 1852, p. 1214, pl. 85. 
Corycaeus obtusus Brady, 1883, p. 116, pl. XLVI. 
Corycaeus obtusus Giesbrecht, 1893, p. 659, pls. 3 & 51. 
Corycaeus obtusus T. Scott, 1893, p. 112. 
Corycaeus obtusus Giesbrecht, 1895, p. 261. 
Corycaeus obtusus Cleve, 1901, p. 6. 
Corycaeus obtusus A. Scott, 1902, p. 421. 
Corycaeus obtusus Thompson & Scott, 1903, p. 286. 
Corycaeus obtusus Cleve, 1903, p. 3061. 
Corycaeus obtusus Wolfenden, 1905 (a), p. 10206. 
This species proved to be moderately common and generally distributed in the area 
investigated by the ‘Siboga’, as shewn by the following records of its occurrence. 
250 
