EEPORT ON THE COPEPODA. 83 



Valparaiso (Station 298), November 18, 1875, and from the west coast of Patagonia 

 (Station 304), December 31, 1875. Prof. Dana's type specimens were from the Lagulhas 

 Bank, near the Cape of Good Hope and from the South Pacific, in lat. 42° to 36°. 



Though Dana's description does not quite accurately apply to the Challenger specimens, 

 more especially as to the spinous armature of the antennas (no notice being taken of the 

 small spines near the base), I can scarcely doubt that it is meant to refer to the species 

 here under review ; the differences, at any rate, are not so great as to warrant my pro- 

 posing a fresh specific name. It must be noted, however, that the size assigned by 

 Prof. Dana to his species (1-1 2th of an inch) is only about half that of our specimens. 



2. Centropages furcatus, Dana (PI. XXVIIL figs. 1-11). 



Oatopia furcata, Dana, Crust. U. S. Expl. Exped., p. 1173, pL lxxix. fig. 1, a.-d. 



Length, 8-100ths of an inch (2 mm.). Body elongated, cylindrical, posterior angles 

 of the cephalothorax produced each into two spines (figs. 1, 2), the outer spine much the 

 longer of the two, and separated from the inner by a deep curve. Anterior antennas 

 spined on the first, second, and fifth joints, as in Centropages brachiatus, and agreeing 

 generally with that species in length of joints ; the right antenna of the male, however 

 (figs. 3, 4), is more feebly serrated in the geniculating portion, and has no spines except 

 on the basal joints, the median joints are only slightly enlarged. The fifth right foot 

 of the male is very similar to that of Centropages brachiatus, but the second joint has 

 only one uncinate process, and the last joint has one internal and two external marginal 

 spines (fig. 8). The fifth foot of the female (fig. 9) is also like Centropages brachiatus, 

 except that the spine of the median joint is slightly serrated, and projects downwards 

 instead of at a right angle to the limb. The first segment of the female abdomen has 

 no hooks, but is very tumid below. Caudal segments narrow, not divergent, about five 

 times as long as broad. Eyes coalesceht, single, indistinctly three-lobed. 



Habitat. — Centropages furcatus was taken in the tow-net, off Port Jackson ; in the 

 Arafura Sea, September 13, 1874 ; and near the island of Mindanao, February 4, 1875. 

 Prof. Dana's specimens were from the Straits of Banca. 



3. Centropages violaceus, Claus (PI. XXVII. figs. 1-14). 



Ichthyoplwrba violacea, Claus, Die frei lebenden Copepoden, p. 199, pi. xxxv. figs. 13, 14. 

 Length, 1-1 1th of an inch (2*3 mm.). Cephalothorax elongated, cylindrical, 

 narrowed towards the front and behind, posterior angles rounded off, internodes 

 slightly constricted. Anterior antennas (fig. 4) very slender, longer than the animal, 

 gradually tapering from base to apex, twenty -four-jointed, fourteenth to nineteenth 

 joints the longest, entirely destitute of spines, but clothed, especially towards the 

 base, with slender setse. The right anterior antenna of the male (figs. 2, 3) is but 



