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 
sete; 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). Hach foot 
of the fifth pair is composed of two angular, setiferous 
lamine (fig. 9). 
1. HcTINosoMA SPINIPES, nov. sp. Pl. XXXVI, figs. 
1—10. 
Hetinosoma melaniceps, Brady. Nat. Hist. Trans. Northumberland 
and Durham, vol. iv, p. 435, pl. xx, figs. 
1—12 (1872). 
_ — Brady and Robertson. Ann. and Mag. 
Nat. Hist., p. 130 (1873). 
Anterior antennz 6-jointed, joints subequal, the 
first three much stouter than the last three, and 
having several sete of moderate length on the outer 
margin, last joint with two long and two shorter setze 
at the apex ; accessory branch of the posterior antenna 
d-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 sete; one very long seta attached to the 
basal joint. All the joints of the swimming feet, as 
