136 BRITISH COPEPODA. 



Length of female ^th %th of an inch (3^ 5 mm.), of 

 male -^th of an inch (1 mm.). 



Mr. Norman records this species as having been 

 taken from " the branchial sac and water-passages of 

 Ascidia mentula" in Shetland. I have myself seen no 

 specimens except Swedish ones sent by M. Thorell, 

 from which my figures were drawn. 



3. DOROPYGUS NORMANI, HOV. Sp. PI. XXXII, figs. 



1 14. 



Adult female. Cephalothorax subpyramidal, attenu- 

 ated towards the front, ovarium broadly rounded 

 behind. Anterior antennae (fig. 2) 10-jointed, the two 

 basal joints very broad, the second short and bearing 

 two stout spines on the outer margin, the remaining 

 eight joints successively narrower to the apex and 

 subequal, the fourth and seventh, however, being 

 longer than the rest ; the whole limb dorsally beset on 

 its outer margin with long setae, which are either 

 very indistinctly, or not at all, plumose. Apical claw 

 of the posterior antenna (fig. 3) very much shorter 

 than the second joint. The mandible-palp (fig. 4) has 

 the outer branch (a) slender, indistinctly biarticulate, 

 and provided with five setae, the inner branch (b) 

 3-jointed, its last joint bearing a series of minute 

 spine-like cilia on the outer margin. The " external 

 lamina" of the maxilla (fig. 5, I e) bears four seta3, 

 the "ultimate lamina" (I u) seven, and the "middle 



