ECTINOSOMA 9 



dary branch which arises from the first joint. Basal 

 joint of the maxilla (fig. 5) strongly clawed ; palp 

 divided into numerous marginal, setiferous lobes. 

 First pair of foot-jaws (fig. 6) 2-jointed, broad, pro- 

 vided with two strong, terminal claws and marginal 

 setaa ; second pair (fig. 7) 3-jointed, long, and slender, 

 second joint the longest. Four pairs of swimming 

 feet, all nearly alike, 2 -branched, each branch com- 

 posed of three nearly equal joints (fig. 8). Each foot 

 of the fifth pair is composed of two angular, setiferous 

 larninas (fig. 9). 



1. ECTINOSOMA SPINIPES, nov. sp. PI. XXX YI, figs. 



110. 



Ectinosoma melaniceps, Brady. Nat. Hist. Trans. Northumberland 

 and Durham, vol. iv, p. 435, pi. xx, figs. 

 112 (1872). 



Brady and Robertson. Ann. and Mag. 

 Nat. Hist., p. 130 (1873). 



Anterior antennae 6-jointed, joints subequal, the 

 first three much stouter than the last three, and 

 having several setae of moderate length on the outer 

 margin, last joint with two long and two shorter setae 

 at the apex ; accessory branch of the posterior antenna 

 3-jointed, longer than the last two joints of the 

 primary branch. Posterior foot-jaw slender, the second 

 joint long (fig. 7) and bearing a series of six spine-like 

 hairs, terminal joint provided with one long and two 

 short apical setae ; one very long seta attached to the 

 basal joint. All the joints of the swimming feet, as 



