REPORT ON THE CRUSTACEA MACRURA. 331 



psalisifonn margin is thick and smooth, and the left blade locks within the right. 

 Anterior to the mandibles a large triangulate cheiloglossa is connected with a raised and 

 anteriorly-directed epistoma. Posterior to the mandibles are the metastomata, a pah- of 

 membranous, pear-shaped, subfoliaceous appendages. 



The first pair of siagnopoda (e) is three-branched ; the first two branches are folia- 

 ceous, and broad at the extremity, where they are fringed with short spines ; the third or 

 outer is lunate, subfoliaceous, and terminates in a point. 



The second pair of siagnopoda (f) consists of three foliaceous branches ; the first two 

 are biramose, the extremity of each branch being fringed with short, thick-set hairs, and the 

 third is short, somewhat rigid and pointed ; at the base is attached a broad, foliaceous mas- 

 tigobranchial plate that projects both anteriorly and posteriorly and is fringed with hairs. 



The third pair of siagnopoda (g) consists of three branches, of which the^first or inner 

 branch is broad, thick, ovate at the apex and fringed with hairs on the inner margin. 

 The middle branch is three-jointed ; the last joint is very small, the penultimate broad, 

 and the first long, and from its base there springs a membranous branch, the extremity 

 of which tapers and becomes thread-like ; from the coxa arises a broad, divided, mastigo- 

 branchial plate, one portion of which is directed forwards, and the other posteriorly. 



The first pah' of gnathopoda (h) is seven-jointed ; the coxa is short and carries a 

 saccular, membranous, mastigobranchial plate, to the base of which a large podo- 

 branchial plume is attached ; the basis is short and carries a long filiform ecphysis ; the 

 meros is long, broad, stout on the outer and thin on the inner side, which is fringed with 

 hairs ; the carpos is short, triangulate, and narrow at the meral articulation. The 

 propodos is broader than the carpos, and the dactylos is short, ovate, and not ungui- 

 culate. The three distal joints lie folded back on the inner surface of the meros. 



The second pair of gnathopoda (/) is pediform ; the coxa is short and carries an ovate, 

 pedunculated mastigobranchial plate, to which a branchial plume is attached ; the basis 

 is short and carries a filiform ecphysis, not so long proportionally as that of the first pair ; 

 the ischium is narrow and longer than the meros, which equals the carpos and propodos 

 in length, whde the dactylos is short, curved, having the margins fringed with hairs, and 

 the extremity flattened and distally rounded, tipped with a small, curved, sharp, unguis. 



The three anterior pahs of pereiopoda are slender and chelate, of these the first pair 

 is the shortest and the third the longest. The fourth pair is longer and more slender 

 than the third, and terminates in a styliform dactylos. It likewise carries a mastigo- 

 branchia, but unlike those of the preceding pairs it has no podobranchial plume attached. 

 The posterior pair of pereiopoda is extremely long and very slender, and terminates in 

 a styliform dactylos, but it carries no mastigobranchial plate or podobranchial plume. 



The first pair of pleopoda in the female is single-branched, the ramus being long and 

 tapering to a filamentous extremity, and supported on a stout basisal joint, near the base 

 of which on the inner side there is a rudimentary membranous appendage. The second 



