304 6. 0. SARS, [N. S. IV 
The maxillipeds (fig. 10) each form a short somewhat compressed stem, 
divided into a number of joints corresponding to those of the gnathopoda and 
legs. The basal joint is much the largest and rather broad, being produced 
at the end interiorly to a short, but distinctly-defined masticatory lobe. This 
is provided at the tip with several Short, partly ciliated spines, and has 
at the base outside a strong plumose seta curving upwards, and 3 others 
affixed at some distance from the inner edge. The ischial joint is very small 
and imperfectly defined, whereas the 2 succeeding joints (the meral and car- 
pal ones) are much expanded and connected by a very oblique articulation. 
From the outer corner of the carpal joint issues a strong, anteriorly-curving, 
plumose seta, and inside, this joint is clothed with a great number of small 
curved spinules. The propodal joint is much smaller than the 2 preceding ones, 
and of a rounded oval form; it is densely clothed with delicate bristles on the 
inner edge, and has besides 3 rather strong plumose setze, 2 of which issue from 
the tip, the 3rd from the outer edge. The dactylar joint is extremely minute 
and linear in form, provided at the tip with 3 small spines. 
At the base of these limbs is attached the complicated branchial appa- 
ratus, which the author elsewhere has shown to be composed of the modified 
expodite and epipodite. In its structure it perfectly agrees with that figured 
in the next species (see Pl. III, fig. 5). 
The anterior gnathopoda (fig. 11) are rather slender, and distinctly 
pediform. The basal joint about equals in length the other joints combined, 
and is nearly linear in form; it is finely ciliated on both edges, and carries 
at the end 3 sete, 2 of which are densely plumose. The ischial joint is very 
small, and but faintly distinguishable, whereas the succeeding ones are all 
well defined, and constitute together a somewhat incurved terminal part, 
which is rather richly supplied with bristles, one of which, issuing from the 
outer side of the propodal joint, is remarkable by its length and dense 
ciliation. At the base of each of these gnathopoda occurs a semilunar movable 
lamella, which in the ovigerous female is bordered by a dense row of slender 
sete increasing in length outwards. These setze project within the incuba- 
tory pouch, and form, together with those of the other lamella, a broad 
fan, which by its regular motions may be the means of aerating the inner 
cavity of the marsupium. 
The posterior gnathopoda (fig. 12) are much larger than the anterior, and 
like the first 2 pairs of legs, are provided at the base with well developed 
natatory exopodites, consisting each of a somewhat cylindrical muscular 
basal part, and a flexible 5-articulate flagellum bearing long ciliated setae. 
The basal joint is very large, nearly twice as long as the remaining joints 
combined, and somewhat curved. It is provided on the distal half of the 
Mélanges biologiques, T. XIII, p. 463, - 
