i8 7 



British Museum, 1908, lias described a new genus and species of Copepod as Paralabidocera 

 hodgsoni. This form is undoubtedly identical with Paracartia aniarctica described by the late 

 I. C. Thompsox some ten years earlier, in 'Transactions of the Liverpool Biological Society', 

 Vol. XII, 1898, page 295. 



The members of the genus Acartia are easily identified by their slender and almost 

 transparent body, and by the structure of the various appendages. 



Four species were represented in the plankton collected by the 'Siboga'. 



1. Acartia danac Giesbrecht. 



Acartia danac Giesbrecht, 1889, p. 26. 



Acartia danac Giesbrecht, 1893, p. 508, pis. 30 & 43. 



Acartia danac Giesbrecht & Schmeil, 1898, p. 154. 



Acartia danac Cleve, 1903, p. 355. 



Acartia danac Cleve, 1904, p. 184. 



Acartia danae Wolfenden, 1905 (a), p. 1023. 



Acartia danac van Breemen, 1908, p. 159, fig. 176. 



This species is closely related to Acartia negligens, but the last thoracic segment is produced 

 into strong spines. It was obtained from the plankton collected at the following two stations. 



Stat. 203 (HENSEN vertical net, 1500 metres to surface), 4 specimens. — Stat. 217, horizontal 

 cylinder, 1 specimen. 



Acartia danac appears to be rather limited in its distribution. It has been recorded 

 from the Atlantic and Pacific Oceans, and from the Mediterranean. 



2. Acartia erythraca Giesbrecht. 



Acartia erythraca Giesbrecht, 1889, p. 26. 



Acartia erythraea Giesbrecht, 1893, p. 508, pis. 30 & 43. 



Acartia erythraca Giesbrecht & Schmeil, 1898, p. 155. 



Acartia erythraea I. C. Thompson, 1900, p. 284. 



Acartia erythraea Cleve, 1901, p. 4. 



Acartia erythraca A. Scott, 1902, p. 408. 



Acartia erythraca Thompson & Scott, 1903, p. 254. 



Acartia erythraea Cleve, 1903, p. 355. 



Acartia erythraea Wolfenden, 1905 (a), p. 1023. 



This proved to be the most common member of the genus in the plankton collected 

 by the 'Siboga'. It was present at the following stations. 



Stat. 16. — Stat. 35. — Stat. 40. — Stat. 47 1 '. — Stat. 71. — Stat. 96 (night). — 

 Stat. 99. — Stat. 101. — Stat. 106. — Stat. 109. - - Stat. 117". -■ Stat. 118 (HENSEN 

 vertical net, 900 metres to surface). — Stat. 121. -- Stat. 136. -- Stat. 141 (HENSEN vertical 

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

 to surface). — Stat. 144. — Stat. 148 (HENSEN vertical net, 1000 metres to surface). — 

 Stat. 149. — Stat. 165. — Stat. 168. — Stat. 169. - - Stat. 174. — Stat. 177». — Stat. 

 185 (HENSEN vertical net, 1536 metres to surface). -- Stat. 203 (HENSEN vertical net, 1500 

 metres to surface). — Stat. 205. -- Stat. 2io\ -- Stat. 213. — Stat. 230 (HENSEN vertical 

 net, 2000 metres to surface). — Stat. 252. -- Stat. 276 (HENSEN vertical net, 750 metres 

 to surface). — Stat. 282. — Stat. 315. 



187 



