TROPICAL PLANKTON. 279 
Scolecithrix dana, Lubbock. 
1856. Undina dane, Lubbock, Trans. Entom. Soc., Lond., 4th Ser., 
COV. pu lD sy bl. UX. 
The range of distribution of this species in these gather- 
ings is interesting, as 1t occurs only from the centre of the 
Indian Ocean, and, with one exception, at all the stations 
up to Calcutta. In neither collection was it taken near ~ 
the African coast, nor in the Red Sea nor Mediterranean. 
Phaenna spinfera, Claus. 
1863. Phaenna spinifera, Claus, Freileb. Cop., p. 188. 
This easily recognisable species occurs in stations 1, 2, 3, 
5, 6, of the Wyse collection, but not elsewhere. It has a 
wide range in the Atlantic and Pacific Oceans, and Claus 
and myself have reported it from the Mediterranean. 
Centropages brachiatus, Dana. 
1849. Pontella brachiata, Dana, Proc. Amer. Acad., vol. II., p. 27. 
This species also has a very wide range, but was only 
found at two of the Mediterranean stations, Nos. 22 and 
23. In 1888 I reported it from Malta. 
Centropages furcata, Dana. 
1849. Catopia furcata, Dana, Proc. Amer. Acad., vol. II., p. 25. 
Occurs frequently in both collections, and widely dis- 
tributed throughout the entire distance traversed. 
Centropages violaceus, Claus. 
1863. Ichthyophorba violacea, Claus, Freileb. Cop., p. 199, Pl. XXXYV. 
This species was taken at 16 out of the 23 Wyse stations 
and at 4 of the Herdman stations, being generally dis- 
tributed. Some of the plumes to the appendages are 
usually of a deep violet colour, as well as parts of the 
cephalothorax. The dark red pigment spots noticed by 
Claus were conspicuous in several of the specimens found. 
