tDYA. hia 
All the joints are somewhat sparingly setose, and the 
fourth bears a long curved (olfactory?) appendage 
(fig. 2, a); in the male (fig. 3) the median joints are 
swollen and coalescent, and the terminal joints are 
constricted at the points of articulation. The posterior 
antenne are 3-jointed (fig. 4), and bear several 
terminal sete, five of which are geniculated; the 
inner branch is long and 4-jomted. First and second 
foot-jaws (figs. 7, 8) slender, with long curved claws. 
The inner branch of the first pair of feet consists of 
two long joints, the first of which is much dilated 
above; each joint bears a very long plumose marginal 
seta (fig. 9, a, a), and the last is armed at the apex 
with two slender claws; outer branch 3-jointed, short, 
and broad; last joint very small and truncate, armed 
with seven moderately long and stout sete, the five 
shorter of which bear on their concave margins a few 
secund spine-like apical cilia; the first and second 
joints also bear each a single stout plumose seta. 
Fifth pair of feet (fig. 11) 2-jointed, first joint short, 
setiferous at the angles, second elongated, marginally 
ciliated, and at the apex bearing five long sets, smaller 
in the male. Fourth and fifth abdominal segments 
very short; caudal segments short, about as long as 
broad. Inner tail-seta nearly as long as the body of 
the animal, outer about half as long, both finely 
aculeate in their entire length. Animal usually colour- 
less or pale milky white, often yellowish, and some- 
times distinctly banded with pale lilac or purple. 
Length 3th of an inch (1 mm.). 
This species is almost ubiquitous in the British seas, 
