25i 



Stat. 16. — Stat. 35. - - Stat. 36. — Stat. 47''. -- Stat. 71. -- Stat. 75 (HENSEN vertical 

 net, 11 moties to surface). ■ - Stat. 93. — Stat. 99. ■ - Stat. 121. — Stat. 141 (HENSEN 

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

 metres to surface). - Stat. 14S (HENSEN vertical net, 1000 metres to surface) — Stat. 149. — 

 Stat. 165. — Stat. 174. — Stat. 184. — Stat. 185 (HENSEN vertical net, 1536 metres to surface). — 

 Stat. 203 (HENSEN vertical net, 1500 metres to surface). — Stat. 204. — Stat. 205. — 

 Stat. 217 (horizontal cylinder). — Stat. 220 (HENSEN vertical net, 200 metres to surface). - 

 Stat. 229. — Stat. 243 (HENSEN vertical net, 1000 metres to surface). — Stat. 245. — Stat. 

 271. -- Stat. 276 (HENSEN vertical net, 750 metres to surface). — Stat. 304.. — Stat. 315. 



Corycaeus obtusus is a rather small and moderately robust species. The abdomen of the 

 female is composed of two segments. The second segment is comparatively short and wide. 

 The furcal joints are slightly divergent and are rather longer than the anal segment. 



This Corycaeus has been recorded from various parts of the Indian Ocean and from 

 the Pacific. 



1 3. Corycaeus robust lts Giesbrecht. 



Corycaeus robustus Giesbrecht, 1891, p. 4S0. 



Corycaeus robustus Giesbrecht, 1893, p. 660, pis. 2 & 51. 



Corycaeus robustus Cleve, 1901, p. 6. 



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



Corycaeus robustus Cleve, 1903, p. 361. 



Corycaeus robustus Cleve, 1904, p. 188. 



Specimens belonging to this species were obtained frorn the plankton collected at the 

 following stations in the area investigated by the 'Siboga'. 



Stat. 96 (day). — Stat. 98. — Stat. 99. — Stat. 112. -- Stat. 128 (HENSEN vertical net, 700 

 metres to surface). — Stat. 142. — Stat. 169. — Stats. 194—7. — Stat. 203 (surface). — Stat. 

 2IO '. — Stat. 215'. — Stat. 216. — Stat. 217 (horizontal cylinder). — Stat. 223. — Stat. 

 224. — Stat. 225. — Stat. 282. — Stat. 304. 



2 : 



Corycaeus robustus is a moderately large and stout form. The abdomen of the female 

 is composed of two segments. The genital segment is large and oval in shape. A distinct 

 tubercle is present on the dorso-lateral margins. The anal segment is short and wide. The 

 furcal joints are stout and are slightly divergent. Each joint is about one and a half times 

 longer than the anal segment. 



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



14. Corycaeus speciosus Dana. 



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

 Corycaeus speciosus Dana, 1852 — 55, p. 1220, pi. 86. 

 Corycaeus speciosus Brady, 1883, p. 115, pi. XLVI. 

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

 Corycaeus speciosus T. Scott, 1893, p. 112. 

 Corycaeus speciosus I. C. Thompson, 1900, p. 292. 

 Corycaeus speciosus A. Scott, 1902, p. 420. 

 Corycaeus speciosus Thompson & Scott, 1903, p. 285. 



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