251 
Stat. 16. — Stat. 35- — Stat. 36. — Stat. 47>. — Stat. 71. — Stat. 75 (HENSEN vertical 
met, 11 metres 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. 148 (HENSEN vertical net, 1000 metres to surface) — Stat. 149. — 
Stat. 165. — Stat. 174. — Stat. 184. — Stat. 185 (HENSEN vertical net, 1536 metres to surface). — 
Sicia 203m eNSENeaventicalenei 1500 metres to Sunface), ——= Stat. 2040 —— Stata 20501 — 
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. 
13. Corycaeus robustus Giesbrecht. 
Corycaeus robustus Giesbrecht, 1891, p. 480. 
Corycaeus robustus Giesbrecht, 1893, p. 660, pls. 2 & 51. 
Corycaeus robustus Cleve, 1901, p. ©. 
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 from 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. 
210°. — Stat. 215*. — Stat. 216. — Stat. 217 (horizontal cylinder). — Stat. 223. — Stat. 
224. — Stat. 225. — Stat. 282. — Stat. 304. 
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 spectosus Dana. 
Corycaeus spectosus Dana, 1849, pp. 8—6I. 
Corycaeus speciosus Dana, 1852—55, p. 1220, pl. 86. 
Corycaeus spectosus Brady, 1883, p. 115, pl. XLVI. 
Corycaeus spectosus Giesbrecht, 1893, p. 660, pl. 51. 
Corycaecus spectosus T. Scott, 1893, p. 112. 
Corycaeus spectosus 1. C.. Thompson, 1900, p. 292. 
Corycaeus speciosus A. Scott, 1902, p. 420. 
Corycaeus speciosus Thompson & Scott, 1903, p. 285. 
251 
