270 Messrs. J. Wood-Mason and A. Alcock on 
The coxopodite of the first maxille is much shorter and 
wider than the basipodite; the endopodite is a short, simple, 
and undivided finger-shaped joint with a few sete on its 
outer apex, and the exopodite appears to be represented by a 
firmly chitinized round conchoidal plate, the convex face of 
which is turned downwards and backwards. 
The coxopodite of the second maxille is but little shorter 
but much narrower than the basipodite, not extending nearly 
so far towards the middle line; the basipodite is subdivided ; 
the endopodite differs from that of the first maxilla only in 
being somewhat larger; the anterior lobe of the scapho- 
gnathite is much broader than the posterior lobe, in which the 
apical fringe is developed into excessively long and fine sete. 
Jn the first maxillipedes the coxopoditic plate is rudi- 
mentary and furnished with limp hairs, the functional jaw 
being entirely formed by the basipodite ; the endopodite is a 
narrow slightly curved and knife-like pointed plate, the exo- 
podite is a broad and abruptly incurved falciform plate, and 
the epipodite is two-leaved. 
The second maxillipedes have only five distinct joints, the 
third and fourth joints of the typical malacostracous limb being 
indistinguishably fused together ; the first jot bears a tri- 
angular epipodite, the second a long, tapering, undivided and 
membranous exopodite, the third is about as long as the 
second, but only about half its thickness, the fourth is short, 
about half as long as the third, the fifth is broadly subtri- 
angular and does not enter into the formation of the functional 
jaw, which is wholly formed by the very short and broad 
wedge-shaped sixth joint. 
The external maxillipedes present only five distinct joints, 
the sixth and seventh, as well as the third and fourth, joints 
being indistinguishably fused together. ‘The first and second, 
which are ankylosed together, are short, stout, and subequal : 
the first bears a small oval and subpedunculated hard process, 
probably representing an epipodite; the second, a flagellar 
exopodite, similar to that of the second maxillipedes; the 
third joint, forming the functional jaw, is an obclavate com- 
pressed sclerite, and is strongly curved to the configuration of 
the underlying appendages ; its inner margin bears no fringe 
of sete ; the fourth and fifth joints are slender, cylindrical, 
and fringed with narrow, transverse, scale-like rows of sete 
on the inner edge; the fourth is a little shorter than the third 
and exactly halt of the fifth, which latter is almost straight, 
and tapers beyond the middle of its length very slightly and 
gradually to a bluntish point bearing a few stiff sete. 
The legs of the first pair are built upon the same plan as 
