252 BOPYRID. 
narrowed so as to resemble a shield, and embedded in the 
first segment of the body. Its anterior margin is dilated 
over the base of the antenna, the extremities of which 
extend beyond it. The inner pair of antenne are 
minute and rudimental; the outer pair are larger, and 
composed of five joints, gradually attenuated, and ter- 
minated by a small articulated flagellum. The mouth is 
covered by a pair of lamellated foot-jaws, somewhat re- 
sembling those of the genus Cymothoa, and the mandibles 
are arranged as in the same group; but, as described by 
M. Edwards, they are more slender fowards the tip, and 
are destitute of any articulated appendage. The other 
parts of the mouth appear to be replaced by semi-mem- 
branous lobes, of which the precise structure has not yet 
been determined. The segments of the body are dis- 
tinct, with the lateral margins sub-continuous, but desti- 
tute of epimere, thus disagreeing with the Cymothoe. 
The legs resemble those of the male; each of the six 
anterior pairs are furnished beneath at the base with two 
appendages of considerable size, one being broad, folia- 
ceous, of a semi-corneous consistence, and folded beneath 
the body so as to assist in forming a large ovigerous 
pouch, covering the whole of the underside of the body ; 
the other being an elongated slender membranous fila- 
ment, which lies on the outside of the body, floating in 
the water, and resembling the branchie attached to the 
legs of the Amphipoda. The tail is small and ovate, with 
the segments indistinct, except at the sides, where they 
are marked by slight incisions ; the appendages attached 
to the five anterior segments are elongate, and branched 
like a piece of coral, whilst the posterior pair are slender, 
cylindrical, and simple. Several of the basal appendages 
are, moreover, furnished at the base beneath with a small 
scale, lying beneath the tail. 
