AMPHIPODA. 



NATATORIA. 



NIPHARGUS AQUILEX. 



315 



GAMMA RIDES. 



Niphargus aquilex. 



Niphargus stygius. 



NIPHARGUS AQUILEX. 



Specific character. Very long and slender. Coxa? of all the legs not 

 so deep as the segments to which they are attached. First three segments of 

 the tail nearly of equal depth, with their posterior angles rounded. Gna- 

 thopoda very small and equal, having the propoda triangular ; the superior 

 and inferior margins and palm being of nearly equal length, with the angles 

 rounded off. First and second uropoda very short. 



Length ^ inch. 



Schiodte, Comm. Soc. Reg. Dan. 1855, p. 350. 

 Nat. Hist. Review, i. p. 41, fig. b. White, 

 Hist. Brit. Crust, p. 187. 



Westwood, Proceed. Linn. Soc. No. li. p. 218, 

 April 19, 1853. Spence Bate, Ann. Nat. 

 Hist. 2 ser. six. Cat. Amph. Brit. Mus. p. 174, 

 pi. xxxii. fig. 1. (but query of Schiodte.) 



Koch, in Contin. of Panzer, Ins. Germ. No. 186, 

 pi. 22 ; and Deutschl. Crust. Myr. u. Arach. 

 heft 36, No. 22. 



De la Vallette St. George, De Gammaro 

 puteano, pi. i. fig. 5. 



Caspary, in Yerhandl. d. Naturf. Yereins fur 

 Rheinland, Jahrg. 6, Bonn, 1849, p. 39, 

 t. 2, f. 1-19. Hosius, De Gainmari Specie- 

 bus, Diss. Acad. 26 Jul. 1850, Bonn*, p. 20, 

 tab. 1, fig. 7, 12. tab. 2, fig. 22 ; also in Wieg- 

 mann's Archiv. 1850, i. p. 235. 



Gammarus puteanus, var. 



Gammarus puteanus. 

 Gammarus puteanus. 



