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



Calanus minor Geve, 1903, p. 357. 



Calanus minor Geve, 1904, p. 186. 



Calanus minor Wolfenden, 1905 (a), p. 995, pi. XCVII, figs. 36—38. 



Calanus minor Sars, 1905 (a), p. I. 



Calanus minor Esterly, 1905, p. 126, fig. 2. 



This species although rather rare in the 'Siboga' collections was apparently well distributed 

 throughout the area investigated, as shewn by the following list of stations where its occurrence 

 was noted. 



Stat. 36. -- Stat. 47'.— Stat. Si.— Stat. 96 (night). — Stat. 118. — Stat. 125. — Stat. 128.— 

 Stat. 136. — Stat. 141.— Stat. 143. — Stat. 144. — Stat. 14S. — Stat. 157. — Stat. 165. — 

 Stat. 168. ■ ■ Stat. 184. — Stat. 186. — Stats. 194—7. — Stat. 204. — Stat. 210'. — 

 Stat. 217. — Stat. 282. — Stat. 304. 



Calanus minor appears to be widely distributed in all the warmer seas, and a number 

 of records of its occurrence have been made since the first description was published. Calanus 

 valgus Brady 1883, has been included in the synonymy of this species by Giesbrecht. Wolfenden 

 1 905 (a), draws attention to differences between the figures of Brady and Giesbrecht. The fifth 

 feet of the males from the 'Siboga' collections agree perfectly with the figures given in the 

 'Challenger' report, and in the 'Fauna und Flora des Golfes von Neapel'. The only difference 

 between Calanus valgus Brady and Calanus minor Claus, appears to be in the size. The former 

 is given as 3,5 mm. but the fema'les of C. minor from the 'Siboga' material are only 1,7 mm. long. 



2. Calanus tenuicornis Dana. 



Calanus tenuicornis Dana, 1849, p. 15. 



Calanus tenuicornis Giesbrecht & Schmeil, 1898, p. 18. 



Calanus tenuicornis I. C. Thompson, 1903, p. 15. 



Calanus tenuicornis Geve, 1903, p. 357. 



Calanus tenuicornis Geve, 1904, p. 186. 



Calanus tenuicornis Wolfenden, 1904, p. III. 



Calanus tenuicornis Sars, 1905 (a), p. I. 



Calanus tenuicornis Esterly, 1905, p. 127, fig. 3. 



Calanus tenuicornis Farran, 1905, p. 30. 



Calanus tenuicornis Pearson, 1906, p. 5. 



Calanus tenuicornis Farran, 1908, p. 20. 



Calanus tenuicornis van Breemen, 1908, p. II, fig. 8. 



Calanus tenuicornis Dana, appears to be widely distributed in tropical and temperate 

 seas. It was very rare in the collections taken by the 'Siboga' and was found only in the 

 plankton from Station 282. There it was represented by three specimens. It is a characteristic 

 species with moderately long furca and is easily identified. 



Genus Canthocalanus nov. 



This new genus resembles Calamis in its general appearance. The females might well 

 pass for true members of that genus, as the antennules and mouth organs are of a similar 



