of the Fishery Board for Scotland. 147 



The antennules (fig. 2) are very short, and composed of five joints ; the 

 length of the second joint is about equal to that of the last, but the pen- 

 ultimate joint is very small, as shown by the formula : — 



Proportional lengths of the joints, - 5 • 13 • 9 • 2 • 13 

 Number of the joints, - - - 1 2 3 4 5 



The posterior antennae are of moderate size, the end joint has the inner 

 margin fringed with minute bristles, while two short setse spring from 

 the distal half of the same margin ; the outer rami is very small and uni- 

 articulate, and furnished with two or three setse (fig. 3). 



The mandible, maxillae, and first maxillipeds are similar to those of 

 C. neglerta. The second maxillipeds are very small, the end joint has 

 the inner margin fringed with fine bristles and bears a long and very 

 slender claw (fig. 4). 



All the four pairs of swimming feet are moderately short, and are some- 

 what similar to each other in structure ; the outer branches are three- 

 jointed and bear moderately long, slender spines or setae ; the end joints of 

 the outer branches of the first and second pairs are each provided with 

 four terminal setae, but the third and fourth pairs have five setae round 

 the end of the last joint; these joints of the third and fourth pairs also 

 differ from those of the first and second in that they become gradually 

 and distinctly broader towards the distal extremity, as shown in the 

 drawing (figs. 7 and 8) ; the inner branches are all two- join ted, short, and 

 narrow ; the first joint is very small, but the second is elongated ; the 

 inner branches in the first pair scarcely reach beyond the end of the 

 second joint of the outer branches, while in each of the second, third, 

 and fourth pairs the inner branches are slightly shorter than those of the 

 preceding pair ; the inner branches of the first and second pairs are each 

 furnished with two, and the others with three, terminal setae (figs. 5-8). 



The fifth pair are small ; the primary joint, which is very short, is pro- 

 duced interiorly into a narrow plate, which becomes somewhat wider 

 towards the distal end, and is furnished with a short and moderately elon- 

 gated spine, which is articulated to a notch near the middle of the inner 

 margin, and also with a stout and moderately long spine and an elongate 

 seta on the truncate apex ; the secondary joint is long and very narrow ; 

 a short seta springs from near the middle and another from near the 

 distal end of the outer margin. Moreover, a moderately long and spini- 

 form seta springs from near the distal end of the inner margin of the 

 secondary joint, and there is also a slender apical seta (fig. 9). 



The f ureal joints are rather longer than the combined lengths of the 

 last two abdominal segments, and they each bear a small bristle on the 

 upper half of the outer margin and another on their dorsal aspect. 



Habitat.— Firth of Forth, 1901; rare. 



Fam. HaKPACTICIDjE. 

 Genus Harpacticus. 



Harpacticus uniremis, Krbyer. PI. x., fig. 20. 



This species, which is so fully described and figured by Professor G, 0. 

 Sars in the new volume of his Crustacea of Norway now in course of pub- 

 lication, has been observed in one or two places round the Scottish and 

 English coasts —I have even obtained it in material washed from the 

 filters in use at the hatchery at the Bay of Nigg. 



In this species the limbs are strongly hispid, and it is otherwise quite 

 distinct from the other described species belonging to the genus found on 



