The family Paralepididae is one of the largest in the order Iniomi, consisting of seven genera and forty-eight known species (HARRY, 1953, p.230-231). Two genera and three species of this family are hitherto known from Japanese waters:
Listidum japonicum TANAKA (Japanese name Hadakaeso),
Listidum prolixum HARRY (Japanese name Namehadaka) and Notolepis coruscans (JORDAN and GILBERT) (new Japanese name Hikarieso).
Recently I obtained two specimens belonging to this family. They differ markedly from three known species. I examined and made clear that they are
M. barysoma of only one sepcies in the genus
Magnisdis recorded from off California by HARRY (1953). Description of this rare species is given in the present paper. They were each almost of the same body length, but one specimen was in bad condition as follows. The head was damaged, its left side was taken off except the fourth and the fifth gill-arches. Data of the specimens are as follows.
1. 50 mm. in total length. collected off the east of Erimo, Hokkaido, in a bottom trawl without otter board at 800-930 meters depth, on board the our office's trust examination boat “No.8 Choun Maru, ” during 20-24 June 1957, by technical expert Tatsuo YASUI.
2. Body length is almost the same in the former, data unknown, but it has impressed me as obtained from the adjacent water of Hokkaido on the other our office's trust examination boat in those days collected the former.
Examined specimens almost well agree with HARRY'S descripion. But their body proportions and the number of fin rays somewhat differed from his specimens as shown in table 1.
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