REPORT ON THE AMPHIPODA. 825 



1862. Urotlwe, Bate and WestwooJ, Brit. Sess. Crust., vol. i. p. 192. 



1865. UrotJioe, Lilljeborg, On Lysianassa mageilauica, p. 18. 



1870. ,, Boeck, Crust, amph. bor. et arct., p. 57. 



1876. „ Boeck, De Skand. og Arkt. Amph., p. 224. 



1876. „ Giard, Comptes Rendus, Jan. 3, p. 76; Ann. and Mag. Nat. Hist., ser. 4, vol. xvii. p. 261. 



1879. ,, Sars, Crust, et Pycn. nova, p. 446. 



1885. ,, Sars, Den norske Nordhavs-Exp., p, 164. 



1886. ,, Gerstaecker, Bronu's Klassen und Ordnungen, Bd. v. Abth. ii. p. 501. 



1887. „ Cbevreux, Catal. Amph. Bretagne, p. 10. 



For the origiual defiuition of the genus see Note on Dana, 1852 (p. 257). Dana 

 placed it along with Anonyx in the subfamily Lysianassinse. Costa placed Egidia in 

 the Gammarini, the fourth subfamily of the Gammaridei. Spence Bate in 1862 placed 

 Urothoe between Sulcator and Liljchorgla. The identity between Egidia and Urotlwe 

 was detected by Boeck, who in 1870 and 1876 thus defines the genus : — 



" Mandibles apically only a little dentate. 



" First Maxillee with the palp two-jointed ; the two joints of nearly equal length. 



" Maxillipeds with the second joint of the palp much dilated on the inner side. 



" First and Second Gnathopods with the hand small, subcheliform. 



" Third Perwopods with very broad joints. 



" Third Uropods with the outer ramus a trifle longer than the inner. 



" Telson cleft to the base. 



" Body much depressed, broad ; the head in front only a little produced and 

 rounded ; the side-plates narrow." 



Urothoe lachneessa, n. sp. (PI. LYII.). 



Head broad at the base behind the upper antennae, in front of the insertion of 

 which it is laterally flattened, the upper surface bending down over the base of the 

 upper antennae in a broad rostral portion, of which the distal margin forms an obtuse 

 angle with a rounded apex ; the perseon broad and like all the rest of the back covered 

 wdth a sort of bristly down ; the first three segments of the pleon longer but narrower 

 than those of the perseon ; the postero-lateral angles of the third segment presenting 

 a slightly outdrawn rounded point, with a deep re-entering angle above it. 



No Eyes perceived. 



Uiyper Antennae. — First joint a little longer and a good deal thicker than the. 

 second, the second longer and thicker than the third, the third not as long as the first 

 three joints of the flagellum ; the flagellum of five joints, of which the third is the 

 longest ; one or two short cylinders were seen on these joints ; the secondary flagellum 

 of two joints, the first nearly as long as the first two of the primary, the second 

 shorter and much thinner. 



(ZOOL. CHALL. ESP. — PART LXVU. — 1887.) Xxx 104 



