8 
Calanus minor Thompson, & Scott, 1903, p. 241. 
Calanus minor Cleve, 1903, p. 357. 
Calanus minor Cleve, 1904, p. 186. 
Calanus minor Wolfenden, 1905 (a), p. 995, pl. 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. 81. — Stat. 96 (night). — Stat: 118. — Stat. 125. — Stat. 128. — 
Stat. 136. — Stat. 141. — Stat. 143. — Stat. 144. — Stat. 148. — 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 
1905 (a), draws attention to differences between the figures of Brapy and GirssrecHtT. 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 females of C. sznxor from the ‘Siboga’ material are only i,7 mm. long. 
<- 
2. Calanus tenutcornis Dana. 
Calanus tenuicornis Dana, 1849, p. 15. 
Calanus tenuzcornis Giesbrecht & Schmeil, 1898, p. 18. 
Calanus tenutcornis 1. C. Thompson, 1903, p. 15. 
Calanus tenuicornis Cleve, 1903, p. 357. 
Calanus tenuicornis Cleve, 1904, p. 186. 
Calanus tenuicornis Wolfenden, 1904, p. III. 
Calanus tenuicornis Sars, 1905(a), p. I. 
Calanus fenuicornis Esterly, 1905, p. 127, fig. 3. 
Calanus tenuicornis Farran, 1905, fs ZO: 
Calanus tenuicornis Pearson, £906, p. 5. 
Calanus tenuicornis Farran, 1908, p. 20. 
Calanus tenuicornis van Breemen, 1908, p. 11, fig. 8. 
Calanus tenuicornts 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 Ca/anus 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 
8 
