316 TEANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



serrated only on the inner side ; the inner branch is 

 two-jointed, about half the length of the outer branch, its 

 inner joint being about half as long as the outer one. The 

 densely plumose setae in the second, third, and fourth 

 swimming feet are all jointed at about one-third of their 

 length. The third (fig. 9) and fourth pairs (fig. 10) have 

 both branches three-jointed. The outer branch in both 

 pairs is very similar to that of the second pair. The inner 

 branch of the fourth pair (fig. 10) has a strong hairy 

 spine at the distal angle of the first and second joints in 

 place of jointed seta in the fourth pair. Each of the fifth 

 pair in the female (fig. 12) is one-branched, two-jointed, 

 the first joint short, about as long as broad, with a spinous 

 prolongation in the centre on the inner side. A similar 

 projection, as well as a smaller one occur on each mner 

 side of the segment from which the fifth feet spring. 

 The second joint of the fifth pair is produced into three 

 plumose spines (without articulation), the inner terminal 

 one being longer than the two outer lateral ones. Each 

 of the fifth pair of feet in the male (fig. 11) is one-branched 

 and four-jointed, and together form a powerful clasping 

 organ. The right foot is long and slender, the terminal 

 joint being about the combined length of the other three ; 

 its centre portion almost forms a semi-circle, the continu- 

 ation being a long sharp spine. The left foot is shorter ; 

 there are several setee and a short blunt spine on the third 

 joint ; the fourth, which is small, terminating in a curved 

 claw-like prolongation, with a sharp spine near the apex. 



The caudal stylets (fig. 13) in the female are about as 

 long as broad, those of the male (fig. 14) being rather 

 longer; each bears three long and one short plumose setae. 



Three specimens only, two males and one female, were 

 found in washings from dredged material taken outside 

 Port Erin, in 15 fathoms, in March, 1894. 



