17 
This was one of the most common and widely distributed Calanoids found in the material 
collected by the ‘Siboga’ as the following records shew. 
Stat. 16, 32 specimens. — Stat. 19, 20 specimens. — Stat. 35, 121 specimens. — Stat. 36, 135 
specimens. — Stat. 37, 137 specimens. — Stat. 40, 5 specimens. — Stat. 47°, 90 specimens. 
Stat. 50. — Stat. 66, 265 specimens. — Stat. 71. — Stat. 75, 6 specimens. — Stat. 
10 specimens. — Stat. 89, 3 specimens. — Stat. 93, 26 specimens. — Stat. 96 (day). 
Stat. 96 (night). — Stat. 98, 108 specimens. — Stat. 99, 25 specimens. — Stat. Io1. 
81, 
Stat. 106, 20 specimens. — Stat. 109, 35 specimens. — Stat. 110, 3 specimens. — Stat. 112, 
8 ‘specimens. — Stat. 117%, 128 specimens. — Stat..118, 2 specimens. — Stat. 121. — Stat. 
122, 8 specimens. — Stat..124, 300 specimens. — Stat. 125, 30 specimens. — Stat. 125 
(night), 22 specimens. — Stat. 136, 380 specimens. — Stat. 138, 1336 specimens. — Stat. 
I4I, 20 specimens. — Stat. 142, 3 specimens. — Stat. 143. — Stat. 144, 113 specimens. — 
Stat. 148, 10 specimens. — Stat. 149, 10 specimens. — Stat. 157, 150 specimens. — Stat. 165, 
45 specimens. — Stat. 168, 5 specimens. — Stat. 169, 3 specimens. — Stat. 172, 95 specimens. — 
Stat. 174, 55 specimens. — Stat. 177*. — Stat. 184, 103 specimens. — Stat. 185, 2 specimens. 
Stat. 189", 63 specimens. — Stats. 194—7, 10 specimens. — Stat. 203 (surface), 35 specimens. 
Stat. 203 (1500) metres, 5 specimens. — Stat. 204, 110 specimens. — Stat. 205, 30 specimens. 
Stat. 210%, 5 specimens. — Stat. 213, 2 specimens. — Stat. 215°, 20specimens. — Stat. 216. 
Stat. 217 (horizontal cylinder), 18 specimens. — Stat. 220 (vertical net), 15 specimens. 
Stat. 220 (surface), 33 specimens. — Stat. 223, 10 specimens. — Stat. 224, 15 specimens. 
Stat. 225, 37 specimens. — Stat. 229, 17 specimens. — Stat. 230. — Stat. 243, 5 specimens. — 
Stat. 245, 30 specimens. — Stat. 252, 3 specimens. — Stat. 271. -— Stat. 276. — Stat. 282, 
32 specimens. — Stat. 304, 70 specimens. — Stat. 315. 
The numbers of specimens noted above, do not in every case represent the whole of 
Undinula vulgaris present 
in the samples. 
The female of Undinula vulgaris is easily distinguished from the female of the next 
species, by the presence of strong spines at the terminations of the last thoracic segment. In 
some specimens the left side has two spines instead of one. The second joint of the exopodites 
of the second pair of feet in both sexes, is deeply notched at the base. The exopodite of the 
left foot of the male is much elongated. The outer spine of the prehensile apical joint has no 
tooth on its inner margin, 
and the endopodite is absent. 
2. Undinula darwini (Lubbock). 
Undina darwint Lubbock, 1860, p. 7, pl. 20. 
Undina darwint Brady, 1883, p. 54, pl. XVI. 
Calanus darwint 
Calanus darwint 
Calanus darwint 
Calanus darwini 
Calanus darwini 
Calanus darwini 
Calanus darwini 
Calanus darwint 
Calanus darwini 
Calanus darwini 
Giesbrecht 1803, 4. Ok) pls) 0.9.75) 8. 
Giesbrecht, 1895, p. 248. 
Giesbrechthcc;Schmieil nso. py 17 
I, Co UiMi@nyjosoin, WOO, js 27/5 
Cleve, WOOW, joe Bo 
Bi. SOU, COA, jos Mey 
Thompson & Scott, 1903, p. 241. 
(CHEE, WOOF, Oo BH7 
Cleveoo4 sy ps nS5. 
Wolfenden, 1905 (a), p. 994, pl. XCVII, fig. 4o. 
Undinula darwint although less numerous than Undinula vulgaris, was well distributed 
throughout the area investigated by the ‘Siboga’ as shewn by the following records. 
SIBOGA-EXPEDITIE XXIXQ@. 
17 
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