7 6 discovery reports 



Occurrence : 

 St. 146. 8. i. 27 (day). Off South Georgia, 728 m., 1 imm. <$, 24 mm. 



Remarks. W.-Suhm gave a description of a very large mysid collected off the Crozet Islands by the 

 Challenger Expedition in 1873. On account of the peculiar form of the eyes he referred it to the 

 genus Petalophthalmus and, because it lacked the strong prehensile mandibular palp found in that 

 genus, he provisionally gave it the specific name inermis. 



G. O. Sars later founded the species Boreomysis scyphops on some specimens from the waters to the 

 north-west of Finmark and gave a very full description and figures of it (18856, p. 56, pi. vi, figs. 1-22). 

 When writing the Challenger Report (1885, c p. 178) he referred W.-Suhm's specimen to this new 

 species and, although he admitted that the name inermis had priority, he decided that in view of the 

 fact that W.-Suhm had referred it to the genus Petalophthalmus and that the specific name he had 

 suggested could have no significance if the specimen did not belong to that genus, he retained his 

 own name of scyphops= cup-like eyes. At the same time he referred specimens from two Challenger 

 stations in latitudes 53 S. and 50 S., south-west of Australia, to Boreomysis scyphops. Records under 

 this name have since been made from various localities in the North Atlantic and the Arctic seas. 



In 1908 Hansen, who did not accept the idea of bipolarity, made a complete study of all the 

 specimens available from the northern hemisphere and compared them very carefully with those from 

 Antarctic waters. He found (1908, p. 100) that there were consistent differences between them in 

 respect of the shape of the eyes and in the proportions of the antennal scale and concluded that there 

 were in fact two separate species. He retained the name of B. scyphops for those of the northern 

 hemisphere, since these were the first to be fully described, and instituted the name B. distinguenda 

 for the Antarctic form. 



From his study of the rich material of the United States National Museum, W. M. Tattersall (195 1, 

 p. 46) endorsed Hansen's finding that the specimens from the south Pacific and the Weddell Sea 

 (W. M. Tattersall, 1913) belonged to a different species from those from the northern hemisphere. He 

 found that the Antarctic form was by no means confined to southern waters but that it had in fact 

 a very wide distribution in the deep waters of the eastern Pacific from California to the Behring Sea 

 and westward to the Sea of Othotsk. Tattersall considered that, since it is possible to identify the 

 Challenger specimens from the Antarctic with W.-Suhm's Petalophthalmus inermis, that specific name 

 has priority over the later name of distinguenda even though no formal and complete description of it 

 was given at first and he recorded the American captures under the name of Boreomysis inermis. 



Boreomysis microps G. O. Sars, 1884 



1884 Boreomysis microps G. O. Sars, p. 35. 



1885a Boreomysis microps, G. O. Sars, p. 184, pi. 33, figs. 7-10. 



1905 a Boreomvsis subpellucida Hansen, p. 8, figs. 5-8. 



1933 Boreomysis microps, Stephensen, p. 11. 



1951 Boreomysis microps, W. M. and O. S. Tattersall, p. 138, figs. 21 D, 25A-F. 



1951 Boreomysis microps, W. M. Tattersall, p. 55. 



Occurrence : 



St. 100B. 3/4. x. 26 (night). West of Cape Town, 1000-900 m., 1 imm. $, 15 mm. 



St. 287. 19. viii. 27 (night). Gulf of Guinea, iooo-8oo(-o) m., 3 S$, 21 mm.; 2 $?, 19 mm. 



St. 2063. 2. v. 37 (day). North-east of Ascension I. 2 hauls, (i) 600-0 m. fragments of $, (ii) 1150-600 m., 



4 adult $?, largest 20-8 mm., juv. q\ 

 St. 2064. 3. v. 37 (day). South of Monrovia, 1600-1050 m., 1 <J, 1 $, both juv., 15 mm. (Colour note, 'Deep 



orange'.) 



