5IR. G. S\ BRADY ON THE PELAGIC ENTOMOSTRACA. 39 



segments are four times as long as broad, and about equal in 

 length to the terminal setse. 



I first recognized this species from specimens taken by the Bey. 

 A. M. Norman in the Isle of Cumbrae, in a pool above ordinary 

 high-water mark, and into which the sea found access only at 

 spring tides. Since that time I have myself taken it in immense 

 numbers in brackish pools at Hylton Dene near Sunderland, and 

 at Burgh Marsh near Carlisle, and I have also seen a few examples 

 collected by Mr. Norman in brackish water at Hartlepool. When 

 living the animal is of a pale brown tint, but on immersion in 

 spirit, assumes a peculiar vinous red or purple. 



Genus. ICHTHYOPHOEBA, Lilljeborg. 



Head more or less distinct from the thorax. Superior antenna? 

 24-jointed, the right of the male having a hinge joint. All the 

 feet two-branched ; branches three-jointed. Fifth pair of feet in 

 the male prehensile, the inner branch formed for swimming. 

 Abdomen of the male 4 or 5, of the female 3 -jointed ; much more 

 slender than the body. 



1. ICHTHYOPHORBA HAMATA, Lilljelorg. 



Ichtliyophorha hamata, Lillj . ; De Crust, ex ordinibus tribus 



(1853), p. 185, T. XXI, figs. 1-5, and 7-9; and T. XXII, 



figs. 9-12. 

 /. cmgustata, Claus; Die frei lebenden Copepoden (1863), 



p. 199, T. XXXV, figs. 2, 10-12. 

 Diaptomus Bateanus, Lubbock ; Ann. & Mag. Nat. Hist. 



2nd Series, vol. XX (1857), p. 404. PI. XI, figs. 1-3. 



Body slender. Superior antennae slender, as long as the whole 

 body, destitute of spines. Bight antenna of the male slightly 

 swollen in the middle. Inferior angle of the last cephalothoracic 

 segment produced into a hook-shaped spine. Fifth pair of feet 

 two-branched ; the external branch of the right foot in the male 

 terminating in two slender curved claws, the outer of which is 

 the longest, and is armed with two or three short, sharp spines. 

 Outer branch of the left foot two-jointed. Outer branch of the 

 fifth foot, in the female, armed with a long and strong spine pro- 

 jecting inwards from the second joint. Tail segments of moderate 



