372 Mr. E. J. Miers on Crustacea from 
ment is dorsally somewhat carinated; the terminal segment 
is narrow-ovate and divided through rather more than half its 
length by a narrow fissure. The eye-specks are very small, 
pale-coloured, and scarcely distinguishable. Antennules 
scarcely half as long as the antenne ; with two joints of the 
peduncle visible, the first bemg thicker and rather shorter 
than the second; flagellum with from eighteen to twenty joints; 
the antenne have the first peduncular joint very short, the 
next two slender, elongated, and subequal; the flagellum is 
longer than the peduncle, but broken in the two specimens 
I have examined; the coxe of the first four legs are narrow ; 
and the posterior margins of the five succeeding joints in these 
legs are clothed with long hairs. In the first pair of legs, 
which are rather shorter than the next pair, the wrist and 
palm are a little longer than broad and somewhat dilated 
inferiorly, so that these joints are broadest in the middle of 
their length; dactylus scarcely more than half as long as the 
alm and closing against its inferior margin. Second legs 
with the wrist slender, more than three times as long as 
broad ; palm slender and a little shorter than the wrist (which 
it resembles in shape), not dilated below; dactylus rather 
shorter than the palm. The third and fourth legs have the 
penultimate and antepenultimate joimts somewhat dilated, the 
dilatation greatest in the fourth legs; dactylus very slender 
and longer than the two preceding joints taken together. In 
the three posterior pairs of legs the coxee are very short and 
the basa or second joints very considerably dilated; im the 
fifth and sixth pairs these joints are dilated anteriorly as well 
as posteriorly ; in the last pair the anterior margin is straight 
and the large posterior dilatation is broadly rounded ; in the 
fifth and sixth legs the fifth joints are slightly produced at 
their posterior and distal angles; and the dactyli in all three 
are very short. The three posterior pairs of postabdominal 
appendages are biramose, the rami lanceolate; those of the 
last pair slightly sinuated. Colour pale yellowish in spirit. 
Length a little more than 5 lines (11 millim.). 
CIRRIPEDIA. 
Balanus spongicola, Brown. 
To this species, as characterized by Mr. Darwin *, are re- 
ferred numerous small specimens incrusting certain of the 
shells tenanted by hermit crabs in the collection; two or 
* Monograph of the Cirripedia, Balanidaz, p. 225, pl. iv. fig, 1 (1854), 
grap v »~ »?P 8 
