lij(5 AMPHimiDA NOK.MAMA. 



C.l. EURYSTHEUS. 



Eurvstheus, Spcurc Bate, Brit. Assoc. Report, 1855; Synopsis, S,-c..,A)m. 



Nat. JL\sf. Feb. 1857. 



imte, lH.^t. Brit. Crust, p. 181. 

 Gamnianis (Division ++ a), Li/Jchorr/, Ofrcrs. af Kougl Vet. Akad. 



Forhtni(U. 1854, p. 455. 



Coplialon produced anteriorly. Pereion and pleon equally long. 

 Eyes situated at the base of the superior antennae, instead of be- 

 tween the bases of the two pairs. Antenna) subequal, long and 

 slender : superior antennae ha%'ing a secondaiy appendage ; in- 

 ferior antennne arising posteriorly to the superior. Gnathopoda 

 subchelate, unequal. Pereiopoda long, slender. Posterior pair of 

 pleopoda biramous. Telson short, cylindi'ical. 



Tliis genus is separated from Mcera by the form of the cephalon 

 and telson. 



1. Eiuystheus ery-throphthalmus. (Plate XXXY. fig. 7.) B.M. 



Gammarus erythropthalmus, Liljeborg in Ofvers. af Kongl. Vetensk. 



Akad. Forhandl. 1854, p. 455. 

 Eurystheus tridentatus, Spence Bate, Brit. Assoc. Report, 1855 j 



Si/iiopsis, 4r., Ann. Nat. Hist. Feb. 1857. 

 ' White, Hist. Brit. Crust, p. 181. 



Eyes reniform, red. Superior antennfe rather more than half the 

 length of the animal ; peduncle longer than the flageUiun; secondary 

 appendage haK the length of the primary. Inferior antennae scarcely 

 as long as the superior ; flageUum a little longer than the last joint 

 of the peduncle. First pair of gnathopoda small ; carpus longer 

 than the propodos ; propodos triangulate, pakn obhque, equal in 

 length to the inferior margin. Second pair of gnathopoda large, 

 long ; cai'pus as long as, and continuous with, the propodos, inferior 

 margin armed with four fasciculi of hairs ; propodos long, tapering, 

 palm very oblique, concave, anued with three obtuse teeth, inferior 

 margin shorter than palm and carrying three fasciciiH of hairs. 

 Pereiopoda long, slender; three posterior pairs having each an 

 oval bases and long propodos, which latter is distally furnished on 

 the posterior side with a fasciculus of long hairs ; ultimate pah* 

 of pereiopoda reaching a little beyond the two preceding paire. 

 Telson half the length of the peduncle of the posterior pair of 

 pleopoda, tubular. 



Length i of an inch. 



ffah. Macduff" (Mr. Gregor) ; Banff (.¥/•. Edward) ; Skye (Mr. 

 Barlee) ; Oxwieh Bay, Glamorgan, and Plymouth (C. S. B.) ; Kulla- 

 berg in Scania (Liljeborg). 



