TROPICAL PLANKTON. 
bo 
~] 
~ 
Calocalanus pavo, Dana. 
1849. Calanus pavo, Dana, Proc. Amer. Acad., vol. II., p. 138. 
This, perhaps the most elegant of all Copepods, and, at 
the same time, the most fragile, is seldom or perhaps never 
found in a perfect condition. It is splendidly illustrated 
in colours by Giesbrecht—F'auna und Flora des Golfes von 
Neapel, PI. IV., fig. 15. 
The very long plumose antennules in the female, and the 
caudal stylets set at right angles to the abdomen, and 
each bearing four large beautiful plumes, easily distinguish 
it from any other species. 
It occurs once in the Wyse collection, station 7, in the 
Indian Ocean, and twice in the Herdman collection, at 
widely different localities, viz., the South of Africa and 
the Mediterranean, stations 2 and 21. 
As the few specimens found were so mutilated as to be 
hardly recognisable, it is possible there may have been 
more. I have taken it carefully by stationary tow-net 
about the Canary Islands in a nearly perfect condition, and 
now at once recognise it. 
Clausocalanus arcuicornis, Dana. 
1849. Calanus arcuicornis, Dana, Proc. Amer. Acad., vol. II., p. 12. 
Found in the Wyse collection only, between Madagascar 
and the African mainland, and at stations 11, 12, 13, in 
the India Ocean and Bay of Bengal. Claus, Giesbrecht, 
and myself have recorded it from the Mediterranean. 
Aetidius armatus, Brady. 
1892. <Aetidius armatus, Brady, Rept. Voy. ‘‘ Challenger,” Copepoda, 
p. 76, Pl. X., figs. 5—16. 
This species occurs at four stations in the Wyse collec- 
tion, Nos. 1, 6, 20, 28, in the Indian Ocean and Mediter- 
ranean. Its recorded range of distribution includes the 
Atlantic and Pacific Oceans. It is readily noticed by its 
