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in groups. Apart from the bristle of the enclite this joint is quite without bristles. Basale: Of
the ventral bristles one d-bristle is very long; it has a moderate number of long secondary bristles
arranged in irregulär wreaths and has short, fine hairs distally; the rest, most of whieh are short,
have short hairs or are bare. Dorsally this joint has three bristles. Endopodite: The
first joint has four bristles ventrally. The end joint has seven bristles, the two middle ones of
which are rather powerful, claw-shaped, of about equal Iength and strength.
M axilla: — Pro topo dite: Dorso-distally the coxale has a single bristle with
long, fine hairs. The proximal bristle on the outside of the third endite, which is always developed
in other closely-related sub-genera and genera, does not seem to be developed. On the boundary
between the basale and the first endopodite joint there are two bristles, one situated close to
the exopodite and the other at about the middle of the inside of the palp. Dorso-distally on the
coxale there is a rather large, somewhat lamelliform epipodial a p p e n d a g e. The
exopodite is comparatively well developed and has fine, long hairs situated close together;
it is not displaced distally. The endopodite is broad and moderately long.
S i X t h 1 i m b: — The second exopodite joint is rather short and somewhat rounded,
with comparatively few bristles. Its posterior bristles are not strikingly larger than the others.
Seventh limb: — This is furnished with very few, ten at most, cleaning bristles,
some of which are concentrated distally, the others situated irregularly more proximally; with
regard to the latter it may be mentioned that there is never more than one bristle on the same
side of the same joint. The end comb consists of a comparatively small number of teeth, all
of one kind, the distal ones often being exceedingly long, the proximal ones short. Dorsally
close to the end comb the wall of this limb is only weakly or not at all thickened and only quite
weakly concave. Although there is no special adductor, it seems as if this concavity can be
compressed somewhat (like a jaw), as I have sometimes seen in preserved material the teeth
of the end comb pressed inwards.
Furca: — The lamellae are moderately elongated. There are nine claws, which show
no or rather slight signs of division into main claws and secondary claws.
The u p p e r 1 i p is very characteristic for the genus. It is rather large and has six
processes, of which the two anterior ones are unpaired and the other four paired. The posterior
two are shaped like fingers, the others are verruciform, but are, however, at least as long as they
are broad proximally. These processes include the openings of the very strong glands of the
upper lip, which secrete a luminous matter. (The two unpaired dorsal ones correspond to the
dorsal field of glands in closely-related forms, just as the ventral ones do to the two paired ones?)
The rod - s liaped organ is rather short and thick.
The lateral eyes are well developed.
All the species are distinguished by their strong phosphorescence. They rise to the
surface of the sea at nights.
Tropical se a s: Indian and Pacific Oceans.
The name of the Remarks: — The name Cypridina has formerly been used for many heterogeneous elements
sub-genus. belonging to the sub-order Cypridinijormes.
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