192 PROFESSOR CHARLES CHILTON ON THE 



Orchomenopsis proxima Chevreux, 1903, p. 93, fig. 6a-c, and 1906b, p. 13. 

 rossii Walker, 1903a, p. 45, figs. 18-23, and 1907, p. U. 

 (?) „ ahyssorum Walker, 1903b, pp. 224 and 227. 



(?) „ „ Chevreux, 1903, p. 92. 



South Orkneys, Scotia Bay, Station 325 ; trap, 15 fathoms. May 1903. Several 



hundred specimens up to 15 mm. in length, all "taken from trap in one 



day ; bait — penguin." Taken along with O. nodimanus. 

 Station 411, Coats Land, lat. 74" I' S., long. 22° W. ; 161 fathoms. 12th 



March 1904. Many specimens, most of them of large size, about 20 mm. 

 South Orkneys, Station 325; 21 fathoms. September 1903. "Through hole in 



ice made for seal skeleton." Many hundreds of specimens of varying size 



up to 15 mm. Taken along with 0. nodimanus. 

 South Orkneys, Station 325 ; 13-25 fathoms. August 1903. Many specimens . 



O. nodimanus being taken at the same time. 

 South Orkneys, Scotia Bay ; 9-10 fathoms. May 1903. Many specimens ; also 



taken along with 0. nodimanus. 

 South Orkneys, Station 325 ; 27 fathoms ; temperature 29°. June 1903. Many 



specimens ; 0. nodimanus being taken at the same time. 



In order to make clear the discussion of this species it will be well to give the 

 following historic account. The genus Orchomenojjsis was established by Sars in 1893 

 for the species 0. ohtvsa. In 1888 Mr Stebbing had described three species under the 

 genus Orchomeyie , namely : — Orchomene musculosus, described from one specimen about 

 12 mm. long, taken near the south of Japan ; Orchomene ahyssoimm, from the Atlantic, 

 east of Buenos Aires, 1100 fathoms, one specimen, male; and 0. cavimanus, from 

 Kerguelen Island, two or three specimens, the one described being 12 mm. long. Of 

 these species Saks included the first two, and with some doubt also the third, in his 

 genus Orchomenopsis. Many years before this, however, in 1865, Heller iiad de- 

 scribed the species Anonyx chilensis from Chili, and in his revision of the Amphipoda 

 for Das Tierreich Stebbing puts the whole of his three species under Orcliomenopsis, 

 giving Anonyx chilensis Heller as a doubtful synonym of 0. ahyssorum, and identify- 

 ing his species 0. cavimanus with Anonyx zschauii Pfeffer, which had been described 

 from South Georgia in 1888. In 1903 Chevreux described Orchomenopsis proxima 

 from specimens obtained from deep waters in the tropical Atlantic Ocean, at the same 

 time identifying other specimens from the Northern Atlantic with 0. ahyssorum, and 

 describing a new species, O. excavata, which he stated comes close to O. cavim,anus 

 (Stebbing). In 1906 he identified specimens obtained by the French Antarctic Ex- 

 pedition from Graham Land with 0. proxim,a, pointing out a few small differences 

 between the specimens from the two localities, and stating that the species was very close 

 to 0. ohtusa Sars. Meanwhile, in 1903, Walker had described 0. rossii from Cape 

 Adare, also referring to its close resemblance to 0. ohtusa ; in 1907 he examined many 

 specimens obtained from South Victoria Land by the Discovery Expedition, and 



(rot. soc. edin. trans., vol. xlviii., 474.) 



