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secondary spine at the middle of each side, some somewhat shorter and broader proximal teeth,
cut o ff ratber transversally distally. Dorsally, close to the end comb, the wall of the limb is
somewhat thickened and has a more or less weak chitinous wart. It is also somewhat concave
at this point, the depth of the concavity varying. The dorsal and ventral walls of the cavity
are not moveably joined to each other, but at least in some forms they may, however, be pressed
somewhat towards each other like a jaw, when the distal teeth of the end comb are pressed in
towards the dorsal wall of the cavity (see fig. 14 of C. (V.) mégalops). This compression is
effected by a paired short, powerful muscle, which issues proximally somewhat proximo-dorsally
of the point of the limb and is fixed distally to the bottom of the cavity. This muscle is
sorne-times absent; whether in this case the distal teeth can be pressed in or not I am not able to decide,
as I have had only preserved material of these forms at my disposai; I merely point out here that
these teeth were not pressed in on any of the numerous specimens of species without this muscle
that I investigated, while they were pressed in very often on specimens of species with it.
Furca: — The lamellae are moderately elongated. The number of claws from about
nine to eleven, without, or in some cases with, division into main claws and secondary claws.
Upper lip: — This has three glandular helds: an anterior one, unpaired, moderately
large, in which the exits of the glands are directed obliquely forwards and downwards, and two
paired ones, situated somewhat ven trally of the former, the exits of which are directed somewhat more
ventrally. The two latter are sometimes comparatively small and situated distally on a couple of
large tusk-like processes, sometimes they are of moderate size and notraised;
eveninthelast-men-tioned case, however, the three helds of glands are separated from each other by rather deep
groo-ves. There is an unpaired protubérance on the front between the upper lip and the frontal organ.
The rod-shaped organ is well developed and rather short and thick.
The lateral eyes vary in tlieir development; sometimes they are almost
completely reduced.
Remarks: — Besides the three species described below we have probably to include in
this sub-genus a rather large number of the species grouped together by G. \V. MÜLLER in his
work of 1912 under the generic name Cypridina. Of these species I merely mention here:
Cypridina mediterranea, 0. COSTA, 1845, (G. W. MULLER, 1894, p. 206, pl. 2, hgs. 1, 2,
4, 5, 8—20, 22—27, 33).
,, dorsoserrata, G. W. MULLER, 1908, p. 83, pl. IV, hgs. 1—3. 5—10.
„ Sarsi G. W. MÜLLER; G. 0. Sars, p. 43 (215), pl. III, hgs. 1, 2, pl. VIII, hgs. 6. 7.
,, Vanhöffeni, G. W. Müller, 1908, p. 82, pl. \, hgs. 1—8. 13.
„ squamosa, G. W. MÜLLER, 1894. p. 207. pl. 2, hgs. 3, 6, 7, 21, 28—32,34—36.
„ Hilgendorfi, G. W. Müller, 1890, p. 228. pl. XXV. hg. 9, pl. XXVI. hgs. 1—3.
pl. XXVII. hg. 30.
A doser examination of these species will probably make it necessary to widen somewhat
the above diagnosis of the sub-genus.
As the type of this sub-genus I consider the form described below under the name
C. ( V.) norvegica.
.V u tuber oj species.
Type.
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