1/ 



Tl-iis 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. 81, 

 io specimens. — Stat. 89, 3 specimens. — Stat. 93, 26 specimens. — Stat. 96 (day). — 

 Stat. 96 (night). — Stat. 98, 108 specimens. — Stat. 99, 25 specimens. — Stat. 101. — 

 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. 

 141, 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 1 . — Stat. 184, 103 specimens. — Stat. 185, 2 specimens. — 

 Stat. 189 1 , 63 specimens. — Stats. 194 — 7, 10 specimens. — ■ Stat. 203 (surface), 35 specimens. — 

 Stat. 203 (1500) metres, 5 specimens. — Stat. 204, 1 10 specimens. — Stat. 205, 30 specimens. — 

 Stat. 210', 5 specimens. — Stat. 213, 2 specimens. — Stat. 215*, 20 specimens. — Stat. 216. — 

 Stat. 217 (horizontal cylinder), 18 specimens. — Stat. 220 (vertical net), 15 specimens. — 

 Stat. 220 (surface), ^^ specimens. — Stat. 223, 10 specimens. ■ — Stat. 224, 15 specimens. — 

 Stat. 225, 2,7 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 vvhole of 

 Undinula vu/garis 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 onter spine of the prehensile apical joint has no 

 tooth on its inner margin, and the endopodite is absent. 



2. Undinula darzvini (Lubbock). 



Undina darwini Lubbock, 1860, p. 7, pi. 29. 



Undina darwini Brady, 1S83, p. 54, pi. XVI. 



Calamis darwini Giesbrecht, 1893, p. 91, pis. 6, 7, 8. 



Calanus darwini Giesbrecht, 1895, p. 248. 



Ca/anus darwini Giesbrecht & Schmeil, 1898, p. 17. 



Ca/anus darwini I. C. Thompson, 1900, p. 275. 



Calanus darwini Cleve, 1901, p. 5. 



Calanus darzvini A. Scott, 1902, p. 400. 



Calanus darzvini Thompson & Scott, 1903, p. 241. 



Calanus darwini Cleve, 1903, p. 357. 



Calanus darwini Cleve, 1904, p. 185. 



Ca/anus darwini Wolfenden, 1905 (a), p. 994, pi. XCVII, fig. 40. 



Undinula darwini although less numerous than Undinula vulgaris, was well distributed 

 throughout the area investigated by the 'Siboga' as shewn by the following records. 



17 



SlllOGA- EXPEDITIE XXIX tl. 3 



