TROPICAL PLANKTON. O75 
NOTES ON THE COPEPODA. 
Calanus vulgaris, Dana. 
1849. Calanus communis, Dana, Proc. Amer, Acad., vol, II., p. 17. 
One of the commonest ocean species, diffused over the 
the Atlantic, Pacific, and Indian Oceans. It occurs in 
most of the bottles of both collections between 20 SB. lat. 
and 14 N., and again sparingly in the Red Sea. 
Calanus pauper, Giesbrecht. 
1888. Calanus pauper, Giesbrecht, Atti Acc. Lincei Rend., Ser. 4, 
vol. IV., p. 331. 
In the Wyse collection this species does not occur in 
the Indian Ocean, but was present in two of the Herdman 
East African bottles, and again appears in the Red Sea 
and in the Mediterranean; all newly recorded areas, the 
Pacific being its hitherto only known area. It is not 
readily distinguishable except by the swimming feet, and 
especially the 5th pair, which were, in most specimens, 
considerably mutilated by the rush of water, a consequence 
of the necessary mode of ship collection. 
Calanus darwin, Lubbock. 
1869. Undina darwinti, Lubbock, Tr. Linn. Soe., Lond., vol. XXIII., 
pais, bl AXLX. 
This species was found in bottles 13 and 14 of the Wyse 
collection, both taken in the Bay of. Bengal. Its only 
capture in the Herdman collection was to the south of 
Cape Guardafui. Its hitherto reported range is confined 
to the Atlantic and Pacific Oceans. 
Calanus gracilis, Dana. 
1849. Cyclopsina longicornis, Dana, Proc. Amer. Acad., vol. II., p. 18. 
The long, graceful antennules—half as long again as the 
entire animal—characterize this species. It was present 
in four gatherings in the Wyse collection, all from the 
