162 BRITISH COPEFODA. 



2. PELTIDIUM INTERBUPTUM (Goodsir). PL LXXI, figs. 



415. 



Sterope interrupta, Goodsir. Ann. and Mag. Nat. Hist., vol. xvi, 



pi. xi, fig. 10 (1845). 

 Alteuiha bopyroides, Claus. Die frei-lebenden Copepoden, p. 143, 



taf. xxii, figs. 1017 (1863). 

 norvegica, Boeck. Oversigt Norges Copepoder, p. 48 



(1864). 



Body elongated, ovate, deeply incised at the junctions 

 of the thoracic segments. Second joint of the female 

 anterior antenna somewhat swollen, otherwise the organ 

 in both sexes is nearly like that of the preceding species 

 (figs. 4, 5). Second joint of the posterior foot-jaw 

 (fig. 11) very short, the hand ovate and ciliated on the 

 inner margin. Fifth pair of feet (fig. 14) exten ding- 

 beyond the middle of the abdomen, sword-shaped, 

 strongly spinous ; three stout blunt spines the 

 middle one the largest at the apex, and two on the 

 external margin ; one slender marginal seta near the 

 middle. Caudal segments short and broad, armed 

 with four setse, three of which are about as long as the 

 segment itself, and one about twice as long. Integu- 

 ment (fig. 15) thick, porous, very opaque, variously 

 coloured with dark yellowish or reddish brown ; the 

 caudal segments and the antennse pale. Length -^nd 

 of an inch (1*1 mm.). 



This is a very common oceanic species all round 

 our shores, but is only rarely met with between tide- 

 marks. The female is at least as common as the 

 male, although Dr. Claus had not met with a specimen 



