TROPICAL PLANKTON. 289 
agree with Brady that the serrated edges on the abdominal 
sesmehts give it a specific distinctness. 
Copilia denticulata, Claus. 
1863.  Copilia denticulata, Claus, Die Freileb. Cop., p. 161, Pl. XXV. 
figs. 14—20. 
One specimen only was found at station No. 14 Wyse, 
in the Bay of Bengal. Claus originally found this species 
at Messina, and Scott took it in the Gulf of Guinea. So 
we have it from three widely distant areas. The marginal 
denticulations on the ventral side of the abdomen are its 
chief distinguishing character, and may be easily over- 
looked. It is therefore possibly commoner than reported. 
Copilia quadrata, Dana. 
1849. Copilia quadrata, Dana, Proc. Amer. Acad., vol. II. 
Found only at 8 and 11 stations Wyse, and the Indian 
Ocean. Its former records are the Mediterranean and 
Atlantic and Pacific Oceans, the present record widely 
extending its range of distribution. 
Copilia nurabilis, Dana. 
1849.  Copilia mirabilis, Dana, U.S. Expl. Exped., p. 1282, 
Pl. LXXX., fig. 14, a—g. 
This well-marked species was present in 3 of the Wyse 
tow-nettings taken between Madagascar and the main- 
land and one of the Herdman stations in the Red Sea. 
It is evidently widely distributed throughout the large 
southern oceans and the Mediterranean. 
Coryceus ovalis, Claus. 
1863. Coryceus ovalis, Claus, Die Freileb. Cop., p. 158. 
The various species of the genus Coryceus proved to 
constitute the largest proportion of the number of Copepoda 
of any genus in each collection, eleven species being found 
in the Wyse tow-nettings and eight species in the Herdman 
