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way between the selvage and the margin of the shell or in most cases somewhat nearer the latter
and (at least in tlie case of sonie of them) joined by a fine undulating line in about the way
sbown in my fig. 5 of C. symmetrica. Within the ventral part of the posterior margin of the shell,
just dorsally of the left unsymmetrical gland, a number of these glandular exits are joined in
about three groups; each of these groups of glands comprises from two to four glandular exits.
These three groups are situated in line with the other glandular exits or often somewhat inside
them. There is no distinctly developed hinge-socket or hinge-tooth at the posterior dorsal
corner of the shell.
First antenna (fig. 3): — This is of the type described and reproduced by
G. W. Müller. The a-bristle is in most cases about as long as the second joint of this
antenna. The pad of the b-bristle is of the same type and relative length as in C. bispinosa;
see my fig. 3 of this species. The e-bristle lias about 43—47 spines in each row; the distal
15—20 of these spines are situated in pairs, the others alternate more or less regularly; tlieir
shape seems to be the same as is reproduced by G. W. MÜLLER, pl. XVIII, fig. 7, 1906 a; tliere
are no spines or bristles distally of these rows of spines. The anterior side of this bristle
is almost quite bare; only one or a few short secondary bristles can be observed. All the joints
are quite bare.
Second antenna: — Protopo dite: In specimens with shells 2,4 mm. long
this measured about 1,2 mm. Exopodite: The proportion between the length of this
branch and that of the protopodite is about 10 : 18 or 1 : 2. The proportion between the length
of the first joint and the total length of the eight following joints is about 10 : 4 or 10 : 5. The
proportion between the length of the longest natatory bristles and that of this branch is about
3 : 2. The first joint is furnished with spines proximo-dorsally, but these are fewer than in
C. symmetrica (cf. my fig. 12 of this species). Endopodite: This is of the type described
and reproduced by G. W. Müller. First joint: The processus mammillaris has a distal
peg-like process. Third joint: The clasping organ on the right endopodite is in most
cases not quite so strongly bent as in G. W. MÜLLER’s pl. XVIII, fig. 10, 1906 a;
cf. the accompanying fig. 4; this character varies, however, to some extent. The shaft
of the h-bristle is usually furnished with short, fine spines; those of the i- and j-bristles are
usually smooth.
Mandible: — Protopodite: Coxale: The toothed edge of the pars incisiva
has about ten teeth. The distal tooth-list is of about the same relative size and type as lias
been described above for C. oblonga, though the number of teeth is on the average somewhat,
though only slightly, greater than in the species mentioned. The proximal tooth-list is slightly
narrower than the distal one, ifs teeth are rather irregulär, often resembling more or less the type
reproduced in my fig. 18 of C. symmetrica; on the inside it is furnished with small papillae situated
close together. The masticatory pad is rather considérable narrower than the tooth-lists, about
the same as in my fig. 15 of C. symmetrica, in most cases rather indistinctly divided into four or
five transverse ridges and furnished with close small papillae. There is a low tootli just proximally
of the masticatory pad. Basale: The six teeth on the distal edge of the endite have exceedinglv
fine serrulation. The single tooth on the outside of this endite is of about the same type and
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