205 
a minute Crustaceons Animal from Mauritius. 
From the cephalic ring behind, and from a slight eminence, 
arises the anterior leg, or arm, exceedingly robust, reaching to 
beyond the middle of the antennae, cheliferous ; its second joint 
projects like an elbow behind the apex of the first, which descends 
obliquely outwards, and is rounded, thick and short. The third joint 
is much smaller, irregularly triangular, and has the fourth articu- 
lated to it superiorly, the articulating surface looking also slightly 
forwards and inwards. The fourth joint is much the largest, thick 
and short, and carries the cheliferous joint. This latter is nearly 
of the same dimensions as that first described ; it curves down- 
wards about its middle nearly at right angles ; the posterior part 
of the chela fixed, curved inwards, broad, with a blunt tooth at 
its extremity directed inwards, and rows of hairs along its edges ; 
the anterior part is moveable, much narrower, and arched, so that 
its apex rests against the blunt tooth of the fixed part. 
When one of these cheliferous legs is removed, there is ex- 
posed, included between them, the manducatory apparatus, con- 
sisting of a pair of mandibles ?, contiguous posteriorly, separated 
anteriorly ; composed of four or five joints, becoming more and 
more flattened as they approach the apex, of irregular form ; the 
last small, flat, curved inwards, its apex thickly fringed with elon- 
gate curved hairs, and arising from the extremity of a curved 
joint, to whose inferior surface is affixed a semicircular plate, the 
free edge of which is also closely fringed with hairs ; these parts 
are kept by the animal in perpetual motion, most probably en- 
tangling the minute animals which served it for food. 
Immediately above these appear a pair of maxillae 1 somewhat 
rhomboidal when looked at from above ; the contiguous edges 
straight ; the anterior irregular, with a few spines ; exterior 
rounded, appearing as if articulated to one of the basal joints of 
the mandibles : the minute size and transparency, however, makes 
it impossible to ascertain exactly to which of them. They are also 
moved, but not with any thing like the velocity of the above de- 
scribed parts. 
Above these, and with the fringed extremities reaching nearly 
to the end of the mandibles, are on each side two other elongate, 
biarticulate bodies (palpi ?), robust and rounded, whose extre- 
mities are fringed with short hairs ; the hairs of the lower much 
less coarse and longer than those on the upper. When the tip of 
the upper is separated, it appears broad and hollowed, as if to re- 
ceive the extremity of that adjoining inferior. Both lie in imme- 
diate proximity with a superior 1 ip, whose extremity carries a 
minute palpiform process, directed somewhat backwards. 
