284 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 
Acartia erythraea, Giesbrecht. 
1889. <Acartia erythraea, Giesbrecht, Atti Acc. Lincei Rend., Ser. 
4, vol. V., Sem. II., p. 26. 
This is evidently a rare species. Only one specimen 
was found, No. 9, Wyse collection, taken in the Indian 
Ocean. Its previous record by Giesbrecht is from the 
Red Sea. A. laxa, Brady, recorded from the Phillipine 
Islands and elsewhere, much resembles this species, and 
may be identical with it. 
Oithona plumifera, Baird. 
1843. Oithona plumifera, Baird, Notes on Brit. Entomos., Zoologist, 
vol. I., pp. 1983—199. 
This beautiful Copepod was present in about half the 
Indian Ocean Wyse stations, and in Nos. 4, 7, and 8 of 
the Herdman stations, but not elsewhere, although it has 
been, by several writers, reported from the Mediterranean. 
I have found it common about the Canary Islands. The 
lovely red plumose sete on all parts of its body readily 
distinguish it from the next species, O. semis. 
Oithona suemilis, Claus. 
1866. Otthona similis, Claus, Die Copep. Fauna von Nizza, p. 14. 
This minute Copepod was widely distributed through 
both collections. It is a very common northern species, 
and has been reported from the Mediterranean and also 
from the Canary Islands, but apparently not before from 
the Red Sea or Indian Ocean, which considerably extends 
its southern range. 
Microsetella rosea, Dana. 
1847.  Canthocamptus roseus, Dana, Proc. Amer. Acad., Boston, 
vol. I., pp. 150—154. 
In both collections a similar partial distribution of this 
species is noticeable, as it occurs in each between Mada- 
gascar and the African mainland, and again at four stations 
