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elongate as in that species. The upper margin is more strongly conyex than in the other 
species, the whole mandible being narrower in consequence. 
The maxilla (Pl. XXV, fig. 9) is short and grows broader towards the free edge — 
hence this edge is rather long. There is a distinct notch under the upper pair of large spines, 
and there is another distinct pair of larger spines near the inferior angle. Between these 
two pairs, as a rule, about seven spines of smaller dimension are observed. Exceptions to this 
rule seem not to be rare, however: I saw a maxilla of which one (the first) of the spines of 
the upper pair was not developed, another with three spines of equal size at the inferior 
angle, a third in which the free edge was furnished with three large spines and very few 
smaller ones between these. : 
The outer maxillae (Pl. XXV, fig. 10) have the outer lobe elongate and of lanceolate 
shape, the inner lobe short, oval. The length of the outer lobe, in this species, is greater than 
in the other species I was able to compare. The hairs on the surface are delicate and numerous; 
those on the outer lobe form a denser tuft on the inner surface, towards the extremity and 
along the upper half of the inner side; a well-developed and irregularly double row of hairs 
extends, moreover, over the inner surface from the extremity to the upper margin of the inner 
lobe.- The hairs seen on the inner lobe are directed towards the interior and fall over the 
margin of the quadrate shield-like plate with rounded angles, to which both lobes are attached. 
The hairs are, as a rule, very delicate, but many of them are distinctly feathered. 
Cirri. Cirrus of first pair has the rami very unequal: the number of segments was 
found to be g and 21 in the smallest specimen, in a somewhat larger specimen ro and 20, and 
in a much larger specimen 12 and 30. In both rami the segments are tapering towards the 
extremity. Those of the shorter ramus are almost all broader than long; in the longer ramus 
those of the basal part are-broader than long, the middle ones are of a quadrate shape, the 
terminal ones even slightly longer than broad. The segments of the shorter (posterior) ramus 
have the inner face distinctly protuberant, each protuberance bearing a tuft of stronger hairs 
or spines on the extremity. The other hairs, disposed on the segments of both rami in the 
ordinary way, are rather delicate. 
The cirrus of the second pair is shorter than that of the third; the rami are somewhat 
different in length and have g and 11 segments in a smaller specimen, and 12 and 16 in 
a larger one. Each segment bears a row of hairs along the upper margin and a tuft of such 
hairs on the extremity of its somewhat protuberant inner face. 
In the third cirrus both rami are elongate; they have 14 and 16 segments in a smaller 
specimen, and 18 and 21 segments in a larger one. All the segments are nearly quadrate; those 
of the shorter ramus havé a row of rather long hairs along the upper margin, and those of 
the longer ramus, a group of 3 to 4 long hairs with a few shorter ones disposed on the inner 
face of each segment near the extremity. The segments of the latter ramus are somewhat 
protuberant and on these protuberances, between the hairs, a few teeth-like pointed spines 
are observable. 
The cirrus of the fourth pair (Pl. XXV, fig. 11) has 38 segments in the anterior ramus, 
and 46 in the posterior and somewhat longer ramus in the largest specimen I examined. These 
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