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Gigantocypris Mülleri n. sp.
? Gigantocypris pellucida, G. H. FOWLER, 1909, pp. 257, 290.
,, ., Th. Scott, 1912 b, p. 5, pl. IL figs. i—12.
Description: — Female: —
Shell: — Length 14—17 mm. The specimens from S/S „Michael Sars“ and
M/S „Arma uer Hansen“ attained a length of 14—16 mm.; the specimens from S/S
„An t arctic“ 16,5—17 mm. It is almost globular, with about the following proportions:
- length : height : breadth — 16,5 : 15 : 14. Seen from the side (fig. 1) it is almost
perfectly circular, with the posterior part somewhat larger than the anterior; the ventral side
is somewhat flattened. The rostrum small, somewhat convex anteriorly, sometimes a little
more than is shown in the adjoining figure, pointed ventrallv. The posterior opening of the
shell, seen from the side, is sometimes not marked, sometimes more marked than in the adjoining
figure. Seen from beneath (fig. 2) it is also almost circular, with the posterior part
domina ting somewhat over the anterior; sometimes a little more rounded at the back than
is shown in the adjoining figure. Seen from the front it is almost circular. The s u
r-iace of the shell is smooth, without any sculpture or hair. The pores of the surface
are very small and difficult to verify with certamty. Seen from with in (fig. 19):
Medial bristles: On the rostrum there are very mimerous, moderately long, simple, smooth,
rather powerful bristles; on the specimens from S/S „Michael Sars“ and M/S Armauer
H a n s e n“ about 75—125 were observed, on the specimens from S/S „A n t a r c t i c“ about
125—175 (on the adjoining figure, drawn from an „A n t a r c t i c“ specimen, all the bristles
are, for practical reasons, not shown). Xear the point of the rostrum these bristles are arranged
in irregulär rows running within one another; sometimes they are, however, almost entirely
without any arrangement; dorsallv these bristles continue in a single row running near the
border of the shell almost to the junction between the two valves. Near the inner edge of the
incisur there is only one or a few short simple bristles, which vary in their position. Along the
ventral edge of the incisur there are only a few bristles or no bristles at all. Along the anterior
half of the ventral border of the shell on or near the list there is a somewhat varying number
of bristles, most of them of the same type as the rostral bristles, a few short and weak; posteriorly
these bristles become more and more sparse and at the same time shorter and weaker, but medial
bristles may be observed along the whole ventral edge of the shell ; the number of these bristles
is, as al ready stated, somewhat varying; on the average, however, there is the same number
along the whole ventral edge of the shell as on the rostrum. The joined part of the lamellae
along the edge of the shell is very narrow, which is probably connected with the balloon-like
swelling of the shell. The selvage is moderately broad, about the same width along the whole
edge o! the shell, with fine cross-striation, and finely serrated at the edge (fig. 5).
F i r s t a n tenna: — This is rather elongated; the anterior side of the second to
the eighth joint measured, for instance, 4 mm. on a specimen with a length of shell of 14,5mm.;
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