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This genus is a link between Hyperia and Euthemisto, the
form of the body and of the first two pairs of pereiopoda
re-sembles Hyperia, but the elongated fifth pair and the long urus
verge to Euthemisto.
1. Hyperiella antarctica, C. Bovallius, 1887.
Pl. 45, fig. 72—80.
Syn. 1887. Hyperiella antarctica. C. Bovallius. L. c., p. 19.
The head is very deep and short, both pairs of antennee
are comparatively short (in the male), composed of few but
long slender articles. The carpus of the first pair of
pereiopoda is very broad; the carpal process of the second pair is
longer than half the metacarpus. The metacarpus of the fifth
pair is elongated, the anterior margin serrated like a comb.
The metacarpi of the sixth and seventh pairs are not elongated.
The telson equals a fourth of the length of the peduncles of
the last pair of uropoda,
Length 8—12 mm.
Hah. Antarctic Seas arouncl Cape Horn. (S. M., U. M.)
Genus 5. Parathemisto, A. Boeck, 1870.
Syn. 1870. Parathemisto. A. Boeck. Crustacea ampliipoda borealia et
arctica, p. 7.
This genus is most closelv allied to the following genus
Euthemisto, and ought to be regarded as a subgenus rather
than as genus of its own. It differs from Euthemisto only in
the fifth pair of pereiopoda not being longer than the seventh.
From Hyperiella by the elongated metacarpi of the last three
pairs of pereiopoda.
1. Parathemisto abyssorum, A. Boeck, 1870.
Pl. 45, fig. 81—89.
Syn. 1870. Parathemisto abyssorum. A. Boeck. L. c., p. 7.
1872. » » »De skandinaviske og ark-
tiske Amphipoder, p. 85.
pl. 3, fig. 1.
The carpi of the third and fourth pairs of pereiopoda are
only a little dilated, elongate-ovate, armed with a few long
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