064 



THE VOYAGE OF H.M.S. CHALLENGER. 



Locality. — Station 297, south-west of Juan Fernandez, November 11, 1875; lat. 

 37° 29' S., long. 83° 7' W.; depth, 1775 fathoms; bottom, Globigerina ooze; bottom 

 temperature, 35°"5. One specimen, male (as shown by the appendages at the seventh 

 segment of the perseon). Taken in the tow-net at the trawl. 



Remark. — The specific name refers to the elongate character of the perseopods. 

 There are many points of similarity between this species and its Arctic congener, in 

 spite of the vast interval between the localities at which they were respectively met with. 



Genus Eusirus, Kr0yer, 1845. 

 1845. Eusirus, Kr0yer, Naturh. Tidsskr., R. 2, Bd. i. p. 511. 



1859. ,, Bruzelius, Skand. Aruph. Gamin., p. 63. 



1860. ,, Bocck, Forh. ved de Skand. Naturf. 8de M0de, p. 655. 

 1862. ,, Spence Bate, Brit. Mus. Catal. Amph. Crust., p. 154. 

 1862. ,, Bate and Westuood, Brit. Sees. Crust., vol. i. p. 266. 



1865. „ Lilljeborg, On the Lysianassa magellanica, p. 18. 



1866. ,, Heller, Beitnige zur nahereu Kenutniss der Amph. des Adriat. Meeres, p. 32. 



1869. „ Norman, Last Report on Dredging among the Shetland Isles, p. 2S1. 



1870. ,, Boeek, Crust, amph. bor. et arct., p. 76. 



1873. „ C. W. Thomson, The Depths of the Sea, p. 125. 



1876. „ Boeek, De Skand. og Arkt. Amph., p. 500. 



1880. ,, G. M. Thomson, Ann. and Mag. Nat. Hist., ser. 5, vol. vi. p. 4. 



1881. „ G. M. Thomson, Trans. New Zealand Inst., vol. xiii. p. 215. 



1882. „ Haswell, Catal. Australian Crust., p 246. 



1882. „ Hoek, Die Crust, der Fahrten des " Willeni Barents," p. 57. 



1885. „ Carus, Prodromus Fauna? Mediterraneae, pars ii. p. 408. 



1886. ,, Gerstaecker, Bronn's Klassen und Ordnungen, Bd. v. Abth. ii. p. 509. 



1886. ,, Perrier, Les Explorations sous-marines, p. 288. 



1887. ,, Hansen, Oversigt over de paa Dijmphna-Togtet inds. Krebsdyr. 



For the original definition, see Note on Krpyer, 1845 (p. 213) ; Boeek gives the 

 following : — 



" Mandibles apically only a little dentate, the molar tubercle robust. 



"First Maxillae with the palp elongate, acuminate, setose, the first joint more than 

 half the length of the second. 



" Upper Antennas longer than the Lower, the third joint of the peduncle very small, 

 almost rudimentary ; the accessory flageflum very little. 



" First and Second Gnathopods with the hands alike in size and shape ; the wrist 

 elongate, with a spur behind (postice calcarato), narrow, and attached at the middle of 

 the front margin of the ovate inflated hand. 



"The Third, Fourth, and Fifth Perwopods very elongate, slender. 



" The Third Uroptods with the rami equal in length, laminar, setose on the margin. 



"The Telson elongate, only a little apically cleft." 



Gerstaecker says that the telson is " nicht gespalten," but this is not accurate. 





