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The first family Tyroilida», C. Bovallius, 1887.
Head small. Eyes small as in the Gammarids. First pair
of antennse straight, styliform. Second pair of antenna)
angu-larly bent, fixed at the inferior side of the head. Mandibles
without palp. The seventh pair of pereiopoda not transformed.
The inner ramus of the uropoda coaleseed with the peduncle.
Genus Tyro, H. Milne-Edwards, 1840.
Syn.1 1840. Tyro. H. Milne-Edwards. Histoire naturelle des Crustacés.
Tome 3:me, p. 80.
1850. Clyclonia. J, D. Dana. Proceedings of the American Academy
of Science and Arts. Vol.2,p.219.
1SS5. Tyro. H. Milne-Edwards. C. Bovallius. »On some for-
gotten genera among the
Am-phijjodous Crustacea.» Bihang
tili K. Sv. Vet.-Akad. Handl.,
Bd 10, N:o 14, p. 12.
Head truneated anteriorly. First pair of antennse very
robust, long, occ-upying with their basal joints the largest part
of the anterior side of the head. First two pairs of
pereiopoda simple, not cheliform. Fifth pair strongly developed.
Inner rami of the uropoda coaleseed with the peduneles.
Peduncles very long and broad.
1. Tyro borealis, G. O. Sars, 1882.
Syn. 1882. Clydonia borealis. G. O. Sars. »Oversigt af Norges Crustaceer
med forelobige Bemserkninger»
etc. Christiania Vid.-selskabs
Forhandl. 1882, N:o 18, p. 75,
pl. 3 fig. 1.
I have not seen any specimens of this species, but Sars got
both males and females from a great depth (200—300 fathoms),
1 For a more complete svnonymy I refer to my »Monograph of the
Amphipoda Hvperiidea>, just readv for the press.
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