VEG A=EEXPPDIRITONENS VETENSKAPLIGA ARBETEN. dl 
The first family Tyronida, C. Bovallius, 1887. 
Head small. Eyes small as in the Gammarids. First pair 
of antenn&e straight, styliform. Second pair of antenn&e 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 coalesced with the peduncele. 
Genus Tyro, H. Milne-Edwards, 1840. 
Syn.! 1840. Tyro. H. Milne-Edwards. Histoire naturelle des Crustacés. 
Tome 3:me, p. 80. 
1850. Clydomia. J.D. Dana. Proceedings of the American Academy 
ofScience and Arts. Vol.2,p. 219. 
1885. Tyro. H. Milne-Edwards. C. Bovallius. >»On some for- 
gotten genera among the Am- 
phipodous Crustacea.- Bihang 
till K. Sv. Vet.-Akad. Handl., 
1801 IU0 INO HAT TO He 
Head truncated anteriorly. First pair of antenne very 
robust, long, occupying with their basal joints the largest part 
of the anterior side of the head. First two pairs of pereio- 
poda simple, mot cheliform. Hifth pair strongly developed. 
Inner ramli of the uropoda coalesced with the peduncles. 
Peduncles very long and broad. 
1. Tyro borealis, G. O. Sars, 1882. 
Syn. 1882. Clydomia borealis. G. O. Sars. >»Översigt af Norges Crustaceer 
med forelgbige Bemeerkninger» 
etc. Christiania Vid.-selskabs 
Börhandirt882TE Nos: 5, 
PETS 
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 synonymy I refer to my »Monograph of the 
Amphipoda Hyperiidea>, just ready for the press. 
