CENTROPAGES. 67 



2. CENTROPAGES HAMATUS, Lilljeborg. Plate VIII, figs. 



1113. 



Ichthyophorba hamata, Lilljeborg. De crustaceis, &c., p. 185, 

 t. xxi, figs. 1 5, 7 9, and t. xxii, figs. 

 912, (1853). 

 Brady. Nat. Hist. Trans. N. & D. vol. i, 



p. 39, pi. iv, figs. 710 (1865). 

 angustata, Glaus. Die frei-lebenden Copepoden, 



p. 199, t. xxxv, figs. 2, 1012 (1863). 



Diaptomus Bateanus, Lubbock. Ann. and Mag. Nat. Hist. (2nd 



ser.), vol. xx, p. 404, pi. xi, figs. 13 (1857). 



Centropages hamatus, Boeck. Oversigt Copepoder, p. 20 (1864). 



Body slender, smaller than the foregoing species ; 

 spines of the last thoracic segment also smaller. 

 Anterior antennse destitute of spines, of equal length, 

 but more slender than in G. typicus ; in other respects 

 the same. The fifth pair of feet in both sexes are also 

 similar to the same parts in C. typicus, but much more 

 slender, and the claw of the male right foot (fig. 13) 

 is not denticulated. The spines of the swimming feet 

 differ remarkably from those of C. typicus in having 

 their serrated armature much stronger and the teeth 

 separated one from another by a wide interval (fig. 12). 

 Length Yg-th of an inch (1'95 mm ). 



This species, like the preceding, occurs not uncom- 

 monly at the surface in the open sea and appears to 

 have much the same distribution. I have once taken 

 it between tide marks, amongst Algas in rock-pools 

 near Ryhope (county Durham). 



