BELONGING TO A NEW ORDER OF THE CLASS CIRRIPEDIA. 351 
dorsal margin is carinated and minutely denticulated. There 
are three pairs of mandibles, as in the other Cirripedes: the outer 
pair are each apparently composed of three articulations, the 
third or terminal one being much compressed, forming an irre- 
gular oval plate, with the upper end terminating in a tooth-like 
process curved inwards: the two other articulations are much 
narrower, but on account of their minuteness and delicacy, their 
form could not be determined with accuracy. Only two articu- 
lations were observed in the second pair of mandibles; the inner 
or first articulation, is long, thin and straight, with the extremi- 
ties enlarged, and of an irregular form; the outer or second joint 
is very similar to that of the outer pair; it is however provided 
with two incurved teeth or spine-like processes, at the upper ex- 
tremity. The innermost or third pair of mandibles are rather 
wide, squarish plates, with three or four stoutish hairs on their 
upper margin. 
At each side of the mouth, there is a stout arm or palp which 
stands erect and reaches a little above the ridge of the rostrum ; 
the anterior margin of these arms is a little convex, the posterior 
a little concave; and they are furnished with stout, rather soft 
pincers about half the length of the arm, covered with numerous 
long hairs: at the root of the pincers there is an articulation, so 
that they can be either bent forward or carried erect ; there is 
also apparently an imperfect joint at the point where the arm 
joins the side of the mouth; but this could not be determined 
with certainty, as the horny membrane of the limb is so delicate 
that it is impossible to say whether the occasional flexure at this 
part, is owing to its flexibility or to an articulation. It is diffi- 
cult to say whether these arms represent what Dr. Martin-Saint- 
Ange names the jaw-feet in the pedunculate Cirripedes, or the 
two minute processes that are closely attached to the sides of the 
mouth, in these animals, and which are considered palps by some 
writers. They seem to occupy the place of the latter, though 
from their form, they have much the appearance of rudimentary 
anterior feet of the higher Crustacea. 
On each side of the rostrum, extending backwards, and a little 
way below the carinated ridge, there is a series of rather close-set 
