DACTYLOPUS. 107 



armed above the middle of the inner margin with a 

 single, long, plumose seta (fig. 9) ; middle joint of the 

 outer branch thrice as long as the first or third, ciliated 

 on both margins, the cilia of the outer margin being 

 often strong and almost spinous ; the second, third, and 

 fourth pairs (fig. 11) have the branches nearly equal, 

 bearing long plumose setae, and ciliated on the external 

 borders ; the inner branch of the second pair in the 

 male (fig. 10) has the second and third joints coales- 

 cent, the outer margin deeply excavated above and 

 below the middle, and bearing one rather large crooked 

 spine, several strong short setae, and at the apex two 

 stunted spines ; setae of the inner margin three ; fifth 

 pair (figs. 12 and 15) in the female composed of two 

 subequal, broadly ovate joints, each of which bears 

 several rather long apical setae ; the outer joint has 

 also along its free margin a series of oblong, curved, 

 pellucid patches (fig. 12 a) ; in the male the joints of 

 the fifth pair are, as is usual in the Harpacticinae, more 

 angular, smaller, and less profusely setose (figs. 13 and 

 16). Caudal segments short; larger tail setae two 

 thirds the length of the body, outer setae about half as 

 long. Length ^th of an inch (*56 mm.). 



This is probably the commonest British species of 

 the genus Dactylopus, occurring not unfrequently in all 

 kinds of localities, from the brackish water of estuarine 

 pools to depths of at least forty fathoms. I have notes 

 of its capture in the following localities: Durham coast, 

 amongst Laminarice ; in brackish pools, at the mouth 

 of the Seaton Burn, Northumberland ; dredged off Red 

 Cliff and Robin Hood's Bay, Yorkshire, in thirty-five 



