1912.] R. B. SEYMOUR-SEWELL: Surjace-Living Copepoda. 377 
2. Acartia erythraea, Giesbrecht. 
Occurrence: Localities C, E, G, J, L. 
Only a few specimens were obtained in the above localities, 
with the exception of locality E, where it was quite common. 
3. Acartia spinicauda, Giesbrecht. 
Occurrence: Localities A, C, K, N, O, P. 
Genus Tortanus, Giesbrecht. 
1. Tortanus barbatus (Brady). 
Corynura barbata, Brady, Rep. Voy. Challenger, vol. 8, p. 71, 
plate 31, figs. 11-12, 1883. 
Corynura barbata, Giesbrecht, F. u. Fl. Neapel, vol. 19, p. 525, 
1892. 
Tortanus barbatus, Giesbrecht and Schmeil, Das Tierreich, 
pt. 6. Copepoda, p. 158. 
Tortanus barbatus, Scott, The Copepoda of the Siboga Expe- 
dition, pt. 1, p. 18q, pl. lv, figs. 16—18-. 
Several specimens were obtained in localities EK and Q. 
A. Scott considers that T. denticulatus and T. barbatus are in 
reality the same species, but the present specimens differ in 
several particulars from the specimens that he describes as T. 
barbatus in the ‘‘Siboga’’ material. In my specimens the teeth 
on the left 5th leg all have whip-like ends, the outer hair of the 
furca is long and reaches to the end of the furcal joint, and in 
the mid-dorsal line there arises from the anal segment of the 
abdomen a spine-like projection. Brady in his original illustra- 
tion figures a rounded projection. 
The length of the specimens were 1°43 mm. 
I consider that it is advisable to retain the distinction be- 
tween these two species and the above would appear to be typical 
specimens of Tortanus barbatus, while Scott’s specimens were in 
all probability Tortanus denticulatus. 
2, Tortanus gracilis (Brady). 
Tortanus gracilis, Cleve, Plankton from the Indian Ocean and 
Malay Archipelago. Kongl. Svens. Vet. Akad. Handl., Bd. 35, 
INOS Sep. 51, pl: vil) ties, R115, 1901-02: 
Occurrence: Localities B, E, F, G, J, N, O, P. 
Considerable variation was met with in the degree of asym- 
metry of the 5th legs of the females. I am inclined to agree with 
Cleve that T. forcipatus and T. gracilis are in reality the same 
species, the difference in the 5th leg being due to age. 
