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Only in the case of two species belonging to this sub-family, Cypridina ( Dolor m)
■pectinata and Cypridina ( Varyulo) norvegica have I had an opportunity of investigating specimens
captured at different periods of the year. 1 fourni that sexually mature females with embryos
in the brood chamber and also larvae in different stages of these two genera appeared at all the
periods at which specimens were captured. tt seems accordingly probable that these two
species do not have any definite more or less short pairing period but that propagation in
their cases takes place during the whole year. The same thing seems to apply to the other
species belonging to this sub-family (as in all other Cypridiniforms?)
It is uncertain whether the fertilization takes place during a pairing ffight similar to that
( ibserved in the case of Philomedes (Ph.) globosa. All we know for certainty is that benthoic species
of this sub-family have also sometimes been observed in plankton; we find information — though
it is scanty — about this in the literature.
The males seem, at least in some species, to survive for rather a long time after attaining
sexual maturity. There is, as we know, no réduction of the masticatory limbs as in
Philo-medes and Sarsiella. A species of this kind is Cypridina (Vargula) norvegica; the males
and females of this species were found equally numerous during all times of the year. — On
the other hånd, in the samples of Cypridina, (Doloria) pectinata investigated by me sexuali)’
mature males were very rare. During the last larval stage this sex was, however, found to be
somewhat more numerous than the female sex (proportion = about 5 : 4). Do the males
die comparativelv soon after the fertilization of the females in this species?
Genus Gigantocypris G. W. Müller.
( ligantocypris, autoru m.
Description: — Cf. G. W. MÜLLER, 1895. p. 164.
Shell: — More or less globular. With small but proportionately rather deep and
narrow rostral incisui-; the bristles within the incisur variable. Posteriorly close to the hinge
the edges of the valves are separated, by means of which a small, somewhat rounded opening
is formed. The valves united along about 2/3 of the periphery. The adductor weakly developed.
Balloon-shaped; walls very thin, presumably without lime incrustation. Very large forms.
First antenna: — Long, siender, with 7—8 joints; for the proportion between
the joints see the species description below. The third joint relatively long. The sensory
bristle of the fifth joint has a moderate, somewhat varying, number of filaments, rather more
numerous in the males than in the females. On the bristles b and c one or more of the proximal
rami in the male are modified for seizing the female. These ranii, all of which are placed medialiv,
are all oi about the same type, rather short and powerfvd, somewhat swollen proximally,
moderately chitinized dista liv, most often ending with a short hair; a little proximally to half
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