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First antenna: — The first joint is about a third shorter than the second; cf.
the accompanying fig. 4. E-bristle: This is about a third longer than this limb and lias a distinct
knee somewhat distally of the middle. Just proximally of this knee there are two rows of rather
narrow, proximally pointing spines, which are in most cases pressed rather close to the bristle.
The distal parts of these spines are hyaline and their shape is exceedingly difficult to ascertain
with any certainty; as far as I could discover the distal part is about as wide as the proximal
part and is not furnished with any appendage that résolubles a suctorial organ. In the spécimens
investigated by me there were fourteen or fifteen spines in eacli row, all arranged in pairs; cf.
the accompanying fig. 5. (In G. W. MÜLLER’s pl. XVII. fig. 34. 1906 a, there are, however.
only eleven spines, and (J. H. Fowler gives the number as from eight to twelve; cf. pp. 655, 656
below.) The distal spines are rather short and are situated rather close together, the other are
somewhat longer and more sparse the more proximally they are situated. Except for these
rows of spines this bristle lias distally no equipment at ail (there are consequentlv no distally
pointing spines such as are found distally of the suctorial plate in C. elegans). The part distallv
of the knee is narrow. Proximally of the rows of spines there are on the anterior side of this
bristle sparse, exceedingly short secondary bristles (scarcely perceptible with REICHERT’socular 4.
Leitz’s immersion l/12). The b- and d-bristles are subequal and somewhat shorter than the
e-bristle; they have no distinct knee and are furnished with rather iew or a moderate number
of short, fine, distallv pointing spines situated about opposite the distal pairs of spines of the
e-bristle; cf. the accompanying fig. 6. These two bristles are also narrovs and bare distally.
None of these three bristles has pad-like formations. The a-bristle is very long, rather slightlv
shorter than this limb, often bent at an angle proximally but otherwise in most cases more or
less straight; it has no accessorv saccules. The c-bristle is straight and short, about a third or
a half the length of the capitulum of the rod-shaped organ. All the joints are quite bare.
S e c o n d a n t e n na: — P r o t o p o d i t e: In specimens with shells about 1.45 mm.
this measured about 0,7 mm. Exopodite: The proportion between the length of this
brandi and that of the protopodite is about 11 : 20 or 12 : 20. The proportion between the
length of the first joint and that of the eight following joints is about 3 : 1. The proportion
between the length of the longest natatory bristles and that of this branch is about 4 : 3 or 5 : 3.
The first joint has about the same shape as is reproduced below for C. serrulata, but is not
quite so wide; proximally it has a rather sparse longitudinal row of short, fine spines, of about
the same type as in C. symmetrica (cf. my fig. 12 of this species), but with far fewer spines.
Endopodite: First joint: The processus mammillaris has no distal verruca. The a- and
b-bristles have short, fine hairs. Second joint: The c- and d-bristles are comparatively short,
in most cases rather considera bly shorter than this joint (but not always so short as in the
accoin-panying fig. 7); they have short, fine hairs or are almost bare. The e-bristle is comparativelv
well developed, about half as long as the two last-mentioned bristles or sometimes even somewhat
longer. The g-bristle is about as long as or in most cases somewhat shorter than the length
of the protopodite, the f-bristle is rather slightlv shorter; the g-bristle i< in most cases furnished
with sparse, exceedingly short hairs, the f-bristle is bare; none of these is decidedlv
sword-shaped. Third joint: The clasping organs are of the types reproduced by G. \Y. Müller, 1906 a.
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