Corycaeus speciosus Cleve, 1903, p. 362. 



Corycaeus speciosus Cleve, 1904, p. 189. 



Corycaeus speciosus Wolfenden, 1905(0), p. 1026. 



Corycaeus speciosus Pearson, 1906, p. 34. 



Corycaeus speciosus van Breemen, 1908, p. 199, fig. 212. 



This distinct species proved to be widely distributed in the area investigated by the 

 'Siboga'. It was present in the plankton collected at the following stations. 



Stat. 36. — Stat. 40. — Stat. 471.. — Stat. 71. — Stat. 75 (HENSEN vertical net, 11 metres to 

 surface). — Stat. 81. — Stat. 89. — Stat. 93. — Stat. 96 (day). — Stat. 98. — Stat. 112.- 

 Stat. 118 (HENSEN vertical net, 900 metres to surface). — Stat. 121. — Stat. 128 (HENSEN 

 vertical net, 700 metres to surface). — Stat. 133. -- Stat. 138. — Stat. 141 (HENSEN ver- 

 tical net, 1500 metres to surface). — Stat. 142. — Stat. 143 (HENSEN vertical net, 1000 

 metres to surface). — Stat. 148 (HENSEN vertical net, 1000 metres to surface). — Stat. 

 165. -- Stat. 184. — Stat. 185 (HENSEN vertical net, 1536 metres to surface). — Stat. 203 

 (surface). — Stat. 203 (HENSEN vertical net, 1500 metres to surface). — Stat. 213. — 

 Stat. 215'. — Stat. 216. - Stat. 217 (horizontal cylinder). — Stat. 220 (HENSEN vertical 

 net, 200 metres to surface). - - Stat. 223. — Stat. 230 (HENSEN vertical net, 2000 metres 

 to surface). — Stat. 245. — Stat. 271. -- Stat. 276 (HENSEN vertical net, 750 metres to 

 surface). — Stat. 282. — Stat. 304. 



The moderately long and divergent furcal joints of the female of this species readily 

 distinguish it from any of the other members of the genus. 



Corycaeus speciosus has been recorded from various parts of the Atlantic, Indian and 

 Pacific Oceans. 



15. Corycaeus tenuis Giesbrecht. 



Corycaeus tenuis Giesbrecht, 1891, p. 481. 

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

 Corycaeus tenuis Thompson & Scott, 1903, p. 286. 



Specimens belonging to the above species were found in the plankton collected at the 

 following seven stations. 



Stat. 47''. — Stat. 142. — Stat. 143 (HENSEN vertical net, 1000 metres to surface). — Stat. 

 165. — Stat. 203 (HENSEN vertical net, 1500 metres to surface). — Stat. 271. — Stat. 315. 



Corycaeus tenuis is a comparatively slender form and resembles Corycaeus lubbocki in 

 general appearance. The abdomen of the female is composed of tvvo segments. The anal 

 segment is narrow and cylindrical in shape. The furcal joints are slender and are nearly twice 

 as longf as the anal segment. 



This Corycaeus has been recorded from the Indian and Pacific Oceans. 



1 6. Corycaeus venustus Dana. 



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

 Corycaeus venustus Dana, 1852, p. 1222, pi. 86. 

 Corycaeus venustus Brady, 1883, p. 115, pi. LIV. 

 Corycaeus venustus Giesbrecht, 1893, p. 674, pis. 4 & 51. 

 Corycaeus venustus T. Scott, 1893, p. III» 



252 



