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first joint and the total length of the eight following joints is about 1(* : 4. The proportion
between the length of the longest natatory bristles and that of the exopodite is about 7 : 5.
The first joint is similar to that of C. symmetrica. E n d o p o d i t e: This has two joints. First
joint: The a- and b-bristles have short hairs, almost bare. Second joint (fig. 4): The projiortion
between the length of the g-bristle and that of the protopodite is about 3 : 4; this bristle has no
distinct sliaft and is rather broadly sword-sliaped distally (cf. the accompanying fig. 5). The
f-, h-, i- and j-bristles are subequal and about a quarter or a fifth shorter than the g-bristle;
they all have rather well developed shafts and are not sword-shaped distally. The g-, f-, h-,
i- and j-bristles have short hairs proximally; the four latter ones are quite or almost quite bare
distally; the g-bristle has short hairs along one edge. There are no c- and d-bristles. Between
the h- and i-bristles there is an exceedingly small papilla. Pilosity: The second endopodite
joint is bare.
Man dible: — Protopodite: The toothed edge of the pars incisiva is of a type
rather different from the rest of this genus (see the accompanying fig. 6). Its anterior tooth
is of about the same type and relative size as in (all?) the other species of this genus. Behind
this tooth there follows a series of (somewhat more than twenty) smooth triangulär teeth, of
which the anterior ones (about five) are moderately large and strong, the others decreasing in
size and strength the more posteriorly they are situated; the posterior ones form a fine serrulation.
This edge ends posteriorly with a powerful, low, wide, irregularly rounded, smooth tooth. Distal
tooth-list (see the accompanying fig. 7): This is somewhat narrower than the toothed edge;
it has a large, powerful, smooth, fang-like posterior tooth and a single row of about fifteen to
seventeen simple, smooth, pointed, moderately large teeth which vary somewhat in size.
Proximal tooth-list (see the accompanying fig. 8): This is somewhat narrower than the distal
tooth-list. It has a relatively small and somewhat varying number of smooth, pointed teeth, of which
the posterior one is of about the same type and strength as the posterior tooth on the distal
tooth-list, the others decreasing irregularly in size and strength, the anterior ones being quite
small (on both the mandibles in the specimen investigated they were about the same type as
in the accompanying figure). The masticatory pad is rather high, divided into four thin plates
placed transversally, the distal one of which is somewhat narrower than the proximal
tooth-list, the others decreasing somewhat in width the more proximally they are situated; the free
edges of these plates are deeply and irregularly toothed (cf. the accompanying fig. 9). The part
of the pars incisiva that is surrounded by lancet-bristles and hairs is somewhat raised and is
furnished with dense papillae and short, fine hairs. Basale: This has the same number of teeth
on the distal edge of the endite as in the other species of this genus investigated by me; the
difference between main teeth and secondary teeth has, however, almost vanished (the former
are considerably weaker, the latter considerably stronger, than in the majority of the species
of this genus), so that this edge seems rather finely and evenly serrulated (cf. the accompanying
fig. 10). The single tooth on the outside of this process is somewhat wider than each of the (six)
distal teeth and is quite or almost quite smooth. The two appendages on the posterior edge
of this endite are furnished with unusually strong secondary spines. The disto-medial bristle
on this joint is relatively long and has long hairs. The e p i p o d i a 1 appe ndage is
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