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Pseudoconchoecia serrulata, C. CLAUS, 1891 a, p. 72; pi. XIX; pi. XXIII, figs. 1—13.
G. S. Brady, 1897, p. 96; pi. XVII, figs. 22—24.
Conchoecia .. Gr. W. MÜLLER, 1906 a, p. 97; pi. XXII. fig. 24; pi. XXIII,
figs. 20—33.
Pseudoconchoecia ., var. laevis, G. S. BRADY, 1907, p. 2.
Conchoecia ., G. W. MÜLLER, 1908, p. 73.
(serrulata + laevis), G. W. MÜLLER, 1912, pp. 81 and 82.
Description: — See C. Claus 1891a, p. 72 and G. W. MÜLLER, 1906 a, p. 97.
Supplementäry description: — Male: —
S li e I 1: — Length: C. Claus states this as 1,4—1,6 mm. (no difference between males
and females). According to G. W. MÜLLER it is 1,25—1.4 mm. „die des Indischen Oceans
deutlich kleiner“. The specimens investigated by me measured 1,05—1,4 mm. Length : height
about 1,6 : 1; length : breadth about 1,7 : 1. Seen from the side it is of about the
type reproduced by C. Claus, 1891 a, pl. XIX, fig. 1 (see the accompanying fig. 1), i. e. it has
a somewhat less arched ventral margin than in G. W. MÜLLER’S pl. XXII. fig. 24, 1906 a.
Seen from b e 1 o w its greatest width is at about the middle, and, owing to its shoulder
vault being very powerfully developed, the anterior part of the shell is somewhat larger than the
posterior part. Owing to the powerful development of the shoulder vault a sinuation is produced
somewhat behind the middle; apart from this the side contours are evenly curved. The anterior
end is rather broadly rounded and has a symmetrical rostrum, the posterior end is also rounded
or somewhat pointed; cf. the accompanying fig. 2. As has already been pointed out, the shoulder
vault is very powerfully developed, but well rounded. The surface: The sculpture varies,
sometimes being rather powerfully developed, of about the type deseribed by G. W. MÜLLER,
sometimes more or less weak, the striation having more or less completely disappeared just as
„the marginal serrulations“; specimens with reduced shell-sculpture have so far been found onlv
in the Antarctic; cf. p. 686 below. The surface of the shell has no hairs. Seen from inside:
Selvage: This is smooth-edged on the rostrum and along the anterior margin of the shell and
the anterior half of the ventral margin of the shell; it has no spine-like process on the rostrum.
It is finely serrulated along the posterior half of the ventral margin of the shell and the posterior
margin of the shell. The compound glands are of the type deseribed by G. W. MÜLLER. The
glands along the posterior margin of the shell are comparatively weakly developed; their exits
are of about the type deseribed above for C. oblonga. There is a rather well developed oval
hinge-socket and hinge-tooth at the posterior dorsal corner of the shell.
First antenna (fig. 3): — This is of about the type deseribed and reproduced
by G. W. MÜLLER. The retinaculum of the second joint was bare in the specimens investigated
by me; in G. W. MüLLER’s pi. XXIII, fig. 22 this bristle has short hairs. According to G. W.
Müller the „Nebenborsten“ are „nicht behaart“; in the specimens investigated by me these
bristles were furnished with a larger or smaller number of short, fine, distally pointing hairs
about opposite to the distal part of the row of spines on the e-bristle; these hairs were
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