171 AMPniPODA NORMAMA. 



;i. Batliyporeia pelagica. (Plate XXXI. fig. 6.) B.M. 



Thei-sitos pelap^ca, Spence Bate, lirit. Assoc. Iteport, 1855 ; Synopsis, 

 ^c, Ann. Nat. Hist. Feb. 1857. 



Superior antenna; as long as the peduncle of the inferior ; flagellum 

 as long as the peduncle, artieuli small, regular ; at the base of the 

 flagellum thej' are broader than long, but at the distal extremity 

 they are much longer than broad. Inferior antennae long and 

 slender, longer than the animal. First pair of gnathopoda (not 

 made out). The rest not materially diffeiing from the two pre- 

 ceding species. 



Length \ of an inch. 



Hah. Moray Frith {Rev. G. Gordon). 



55. NIPH ARGUS. 



Niphargus, Schiodte, Act. Sac. Reg. Bun. 1851, p. 26 ; Nat. Hist. 

 Jtevietv, i. p. 43, 1857. 



WJiite, Hist. Brit. Crust, p. 186. 



Eyes minute. Superior antennae longer than the inferior, haxing a 

 secondary appendage. Inferior antennae having the peduncle 

 longer than the flagellum. Mandibles with an appendage. Gna- 

 thopoda subequal, subchelate ; carpi narrow ; propoda broad. 

 Posterior pair of pleopoda much longer than the preceding, bira- 

 mous, unequal, the inner branch uniarticulate and very short, the 

 outer biarticidate and very long. Telson single, divided. 



1. Niphargus Stygius. (Plate XXXII. fig. 1.) B.M. 



Niphargus stygiiLg, Schiodte, Act. Soc. Reg. Dan. Trans. 1855 ; Nat. 

 Hist. Revieir, i. p. 43, 1857. 



Westwood, Proc. Linn. Soc. Apr. 1853. 

 Spence Bate, Synojjsis, 8fc., Ann. Nat. Hist. Feb. 1857. 

 Niphargus aquilex, Schiodte, Act. Soc. Reg. Dan. Proc. 1855 ; Nat. 

 Hist. Review, i. p. 43, 1857. 



White, Hist. Brit. Crust, p. 187. 

 Gammarus puteauus, Koch, Deutschl. Crust. Myr. u. Arach. h. 36. 

 n. 22. 



De Vallette St. George, De Gammaro puteano, pi. 1. f. 5. 



Pleon having the postero-inferior angle of the three anterior seg- 

 ments rounded, and fiinged ^vith three or four short equi- 

 distant hairs. Superior antennae three-fourths as long as the 

 animal. Inferior antennte half the length of the superior. Coxae 

 not so deep as their respective segments. Gnathopoda uniform ; 

 the propodos on each pair sub triangular, being of thi*ee nearly 

 equal sides, the sides slightly convex ; palm fringed with a few 

 short equidistant cilia, and defined by a strong spine. Pereiopoda 

 subequal, slender, and furnished with short fine hairs on the 



