2=;o 



Specimens belonging to this species were founcl in the plankton collected at the 

 following stations. 



Stat. 36. — Stat. 66. - Stat. 71. — Stat. 101. ■ ■ 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). 



Corycaezcs longistylis 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 Corycaeus has been recorded from the Indian and Pacific Oceans. 



1 1 . Corycaetis lubbocki Giesbrecht. 



Corycaeus lubbocki 

 Corycaeus lubbocki 

 Corycaeus lubbocki 

 Corycaeus lubbocki 

 Corycaeus lubbocki 



Giesbrecht, 1891, p. 481. 

 Giesbrecht, 1893, p. 660, pi. 51. 

 A. Scott, 1902, p. 421. 

 Thompson & Scott, 1903, p. 285. 

 Cleve, 1903, p. 361. 



Corycaeus lubbocki 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 lubbocki has been recorded from the Indian and Pacific Oceans, and from 

 the Red Sea. 



12. Corvcaeus obtusus Dana. 



Corycaeus obtusus Dana, 1849, pp. 8 — 61. 



Corycaeus obtusus Dana, 1852, p. 1214, pi. 85. 



Corycaeus obtusus Brady, 1883, p. 116, pi. XLVI. 



Corycaeus obtusus Giesbrecht, 1893, p. 659, pis. 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. 361. 



Corycaeus obtusus Wolfenden, 1905 (a), p. 1026. 



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. 



