NO. 1573. PARASITIC COPEPODS— WILSON. 361 



In Perissopus dentatus the carapace is wedge-shaped, the pos- 

 terior margin twice the width of the anterior, the posterior lobes one- 

 third as long as the carapace on the mid-line; there are no lobes or 

 knobs on the ventral surface. The first pair of dorsal plates are 

 elliptical, not reaching forward to the bases of the first legs. The 

 basal joints of the first two pairs of legs are attached by their postero- 

 interior corners, with the rami attached to their exterior margins. 

 The rami of the third legs are fused into a single semicircular lamella 

 tipped with two minute spines. Rami of the fourth legs one-jointed 

 exactly alike, but the exopod tipped with a single spine while the 

 endopod has none. 



In Perissopus communis the carapace is semielliptical, scarcely 

 narrowed at all; the posterior lobes are less than one-seventh the 

 length of the carapace on the mid-line, and are often virtually elim- 

 inated; there is a large hemispherical knob on the ventral surface of 

 the carapace near the lateral margin on either side, opposite the 

 reniform pad of the second maxilliped. The first dorsal plates reach 

 forward to the base of the second maxillipeds. The basal joints of 

 the first two pairs of legs are attached by their anterior margins, with 

 the rami on the posterior margins. The exopods have each the same 

 number of spines similarly arranged, one on the exterior margin and 

 four in a row at the end; the rami of the third legs are as distinct as 

 those of the other pairs; the endopods of the third and fourth pairs 

 of legs are very different from the exopods. 



Genus LAMINIFERA Poche. 



Phyllophora Milxe Edwards, 1840, p. 471. (Phyllophora cornida Milxe Ed- 

 WARD.S, 1840, p. 472, pi. XXXVIII, figs. 13, 14.^Bassett-Smith, 1899, p. 465. 

 Laminifera cornuta Poche, 1902, p. 8.) 



Female. — Carapace triangular, narrowed and rounded anteriorly, 

 the lateral margins only moderately convex; posterior lobes ^^^dely 

 divergent, as long as the entire carapace on the mid-line, broad and 

 well rounded; posterior margin between the lobes very narrow. The 

 three pairs of dorsal plates on the thorax developed into overlapping 

 foliaceous wings, each pair considerably wider than the carapace. 

 The first two pairs are ^\^dely divergent, like the posterior lobes of the 

 carapace, and just meet on the mid-line; the third pair are horizon- 

 tal, their inner margins overlapping considerably. Genital segment 

 quadrangular with rounded corners and a squarely truncated poste- 

 rior margin; sixth segment in the form of a dorsal rounded plate, as 

 in Pandarus. Abdomen attached to the ventral surface of the geni- 

 tal segment, one-jointed, \\nth modified anal laminse attached to its 

 sides at the base, and a ventral plate as in Pandarus. Appendages 

 similar to those in the other Pandarinae; first antennae three-jointed; 

 second pair much enlarged, their terminal claws stout and not much 



