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Conchoecia Valdiviae G. W. Müller.
Conchoecia Valdiviae, G. W.MULIJSR, 1906 a, p. 123; pi. V, fig. 1; pi. XXIII. figs. 8. 10—19.
» „ „ „ „ 1908, p. 79.
„ » „ „ -, 1912, p. 93.
Description: — See G. \Y. MÜLLER, 1906 a, p. 123.
Supplementary descr iption: — F e mal e : —
Shell: — Length: According to G. W. MÜLLER „ziemlich konstant 5,5 mm.“. The
specimen investigated by me was 5,4 mm. long. Length : height about 1,75 :1; length : breadth
about 2,3 : 1. Seen from the side it is of about the type described and reproduced
by G. W. MÜLLER; see the appended fig. 1. Seen from b e low (fig. 2) it is narrowly
oval, with its greatest width at about the middle and the anterior and posterior parts of about
ecpial size and of the same type; the side contours are evenly curved, the ends well rounded
and the rostrum symmetrical. The shoulder vault is rather weakly developed and well rounded.
The surface of the shell has a few scattered moderately long or short bristles. The sculpture
and the compound glands are the same as are described by G. W. MULLER. Seen from
inside: The glands along the posterior margin of the shell are about the same as are described
on p. 618 above for C. oblonga. The selvage is of the same type as is described for C. borealis
p. 709 above. At the posterior dorsal corner of the shell there is a well developed oblong
hinge-socket and hinge-tooth (of about the same type as is reproduced above for C. hettacra).
First antenna (fig. 3): — This has rather weak division into joints. The bristle
of the second joint is somewhat shorter than the capitulum of the rod-shaped organ and has
short hairs. The e-bristle is not sword-shaped distally; it is almost or quite bare proximally
on the anterior side. All the joints are partly furnished with short, rather fine spines.
Second antenna: — Protopodite: In the specimen investigated by me
this measured 2,2 mm. Exopodite: The proportion between the length of this brandi
and that of the protopodite is about 11—12 : 20. The proportion between the length of the
first joint and the total length of the eight distal joints is about 10 : 4. The proportion between
the length of the longest natatory bristles and that of the exopodite is about 3 : 2. The first
joint has rather few spines proximo-dorsally. Endopodite: This has three joints. First
joint: The a- and b-bristles are bare or have only a few short hairs. The processus
mammillaris has a small papilla distally. Second joint: The c- and d-bristles are developed
and are about the same size as is seen in pl. XXIII, fig. 8, G. \Y. MÜLLER, 1906 a. The g-bristle
is somewhat longer than the protopodite; the f-bristle is about a third shorter than the g-bristle;
both are furnished with short hairs and are not sword-shaped distally. End joint:
The h-, i- and j-bristles are subequal, somewhat less than half the length of the g-bristle, and
are about as thick proximally as the f-bristle; all of them have rather slight indications of shafts
and are moderately densely furnished with spines proximally. There is an extremely small
papilla between the h- and i-bristles. The second joint of the endopodite is bare.
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