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S e v e n t h 1 i m b : — The longest end bristle is about a quarter of the length of the
shell. The end joint is furnished with short, fine hairs.
Penis: — This has a marked oo-shape. The part proximally of the contraction is
almost as large as the distal part. It is rounded distally. There is no copulatory appendage.
For further details see figures 31 and 32.
Furca (fig. 30): — This has seven claws; the armature of the claws is very vveak.
Between the first and second claw a rounded, verruciform process seems always to be developed.
Behind the claws there is always an unpaired bristle, about as long as or somewhat shorter than
the posterior claw. The lamellae are furnished with groups of rather short, stift’ hairs, in most
cases on both the medial and the lateral sides.
The rod - shape d organ is pointed distally (sometimes it has two points) and reaches
about as far as the dorso-distal boundary of the third joint of the first antenna (fig. 12).
Upper lip: — This projects rather decidedly and is rounded anteriorly. It is
pro-vided anteriorly with two low, rounded protubérances, one on each side, at some distance
from the middle line (one of these protubérances is indicated in the adjoining figure 10), but
apart from these it is smooth. The glands of the upper lip open out on two moderately large
and somewhat rounded fields, one on each side, at some distance from the middle line and from
the posterior ventral edge of this lip (one of these fields is shown by a weakly undulating line
on the adjoining fig. 10). The posterior ventral edge of the upper lip is rounded (see fig. 11);
its combs project rather decidedly and are furnished with numerous rather fine hairs. No
glands have their exits on these combs. The part between these combs is about, as broad as
each of the latter and is weakly and uniformly convex.
The paragnates are of about the type reproduced by me for Conchoecia rotundata,
p. 650 above. The chitinous lists behind the lower lip are of quite the same type as is reproduced
for Conchoecia symmetrica.
Female: —
Shell: - This differs rather considerably from that of the male. Length, 1,10 to
1,3 mm. Length : height about 2,3 : 1; length : breadth about 2,75 : 1. Seen from the
side (fig. 6), it is elongated, with its greatest height at about the middle and the anterior
and posterior parts of about the same size or the posterior part slightly larger than the anterior
part. The ventral margin is like that of the male; the posterior margin, which is somewhat
more weakly curved than in the male, forms, together with the dorsal margin, an angle that
is rather considerably less than 90°. The posterior dorsal corner is of the same type as in the
male, i. e. the right valve is always furnished with a spine, the left valve has in most cases an
extremely small spine, which is sometimes quite absent (cf. fig. 8). The rostrum is bent
somewhat more ventrally than in the male, and is rather narrow and unsymmetrical; the left rostral
process is longer than the other and is drawn out distally in a more or less long point;
asym-metry varies somewhat; it is seldom more distinct than in the adjoining figure 9, sometimes
it is rather weak. The shoulder vault is not distinct. Seen from below (fig. 7)
the shell is lentil-shaped, with its greatest breadth at or just behind the middle, the posterior
part slightly or not at all larger than the anterior part, with pointed anterior and posterior
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