1092 THE VOYAGE OF H.M.S. CHALLENGER. 



Genus Gammaropsis, Liljeborg, 1855. 



1855. Gammaropsis, Liljeborg, Ofversigt af de mom Skand. art. af slagtet Gammarus, Kgl. 



Vefc.-Akad. Handl. for ar 1853, p. 443. 

 1855-6. ,. Liljeborg, Om Hafs Crust., vid Kullaberg i Skane, Ofv. af Kgl. Vet.-Akad. 



Fork., Tolfte Arg., p. 455. 

 1857. Eurystheus, Spence Bate, Synopsis, Ann. and Mag. Nat. Hist., ser. 2, vol. xix. p. 11 



(sep. copy). 

 1857. ,, White, Popular History of British Crustacea, p. 181. 



1859. Autonoe {pars), Bruzelius, Skand. Amph. Gamm., p. 27. 



1860. Gammaropsis, Boeck, Fork, ved de Skand. Naturf. 8de M0de, p. 659. 

 1862. Eurystheus, Spence Bate, Brit. Mus. CataL Amph. Crust., p. 196. 

 1862. „ Bate and "Westwood, Brit. Sess. Crust., vol. i. p. 353. 

 1870. Gammarnpsis, Boeck, Crust, amph. bor et arct., p. 160. 



1876. „ Boeck, De Skand. og Arkt. Amph., p. 580. 



1877. ,, Meinert, Crust. Isop. Amph. et Decap. Daniw, p. 150. 



1878. Eurystheus, Spence Bate, Crustacea in Couch's Cornish Fauna revised and added to, 



p. 53. 

 1882. Gammaropsis, Sars, Oversigt af Norges Crustaceer, pp. 30, 111. 

 1884. Eurystlieus, Chevreux, Assoc, frang. Congres de Blois, Amph. du Croisic, p. 3. 



1884. Paramenia, Chilton, Trans. New Zealand Inst, vol. xvi. p. 258. 



1885. Eurystheus, Cams, Prodromus Fauna? Mediterranean, pars ii. p. 413. 



1886. Gammaropsis, Gerstaecker, Bronn's Klassen und Ordnungen, Bd. v. Abth. ii. p. 495. 



1887. „ Bonnier, Catal. Crust. Malac. Concarneau, p. 107. 

 1887. ,, Chevreux, Catal. Crust. Amph. Bretagne, p. 27. 



For the original definition of this genus, see Note on Liljeborg, 1855 (p. 286). For 

 the definition of Eurystheus, see Note on Spence Bate, 1857 (p. 294). For the defini- 

 tion of Paramenia, see Note on Chilton, 1884 (p. 550). It was rather for a subdivision 

 of the genus Gammarus than for an independent genus that Liljeborg gave the name 

 Gammaropsis, and this is confirmed by the circumstance that he does not include the 

 name Gammaropsis in the table of genera which he drew up for the Gammaridse 

 in 1865. It is therefore perhaps an open question whether the name Eurystheus 

 which Spence Bate proposed for the genus in 1855, though he did not define it till 1857, 

 should not have been allowed priority. As matters stand, it will be, I think, convenient 

 to give the preference to Gammaropsis, which has obtained the more general acceptance. 

 Boeck gives the following definition : — 



" Upper Antennas with the third joint of the peduncle very long. 



" Hypostome produced in front and acuminate. 



" Fourth pair of side -plates the largest. 



" First and Second Gnathopods in both sexes like one another, but the Second the 

 stronger ; the fifth joint constituting a subcheliform hand. 



" First and Second Perseopods with the finger of moderate size. 



" Third Uropods with the outer ramus a little shorter than the inner." 



To these characters should be added the presence of a well-developed accessory 



