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



Uropods. — Peduncles of the first pair longer than the rami ; the rami subequal, each 

 with three spines on the margin, and at some distance from these a large terminal one at 

 the apex, surrounded by three shorter ones ; the peduncles of the second pair shorter 

 than one ramus, longer than the other; this pair is shorter but stouter than the 

 preceding, very similar in armature, but the longer ramus has four marginal spines ; 

 the peduncles of the third pair much shorter than the rami, which are lanceolate, 

 subequal, with spines on both edges, and some on the surface, some of the spines being 

 in pairs. 



Telson as long as once and a half the breadth at the base, extending beyond the 

 peduncles of the third uropods, cleft for three-quarters of its length, only dehiscent near 

 the end, the two halves apically pointed ; pairs of unequal spines at three points on the 

 surface of each half, seemingly not cpite symmetrically placed, also a couple of cilia 

 midway down between the upper and next pair of spines. 



Length. — The length of the female specimen in the position figured, from the front of 

 the head to the back of the third pleon-segment, was three-tenths of an inch. 



Locality .—KQVgM&l&n, January 14, 1874 ; at the surface. Several specimens. 



Remark. — The specific name refers to the place of capture. 



Family P L E u s t i D ^. 



For the characteristics of the subfamily Pleustinse, in which Buchholz places the 

 genera P/ews^es and Parapleustes, see Note on Buchholz, 1873 (p. 424); in changing 

 the subfamily into a family I propose to omit from the definition the statement that 

 the mandibles have no molar tubercle. 



Genus Fleustes, Spence Bate, 1858. 



1858. Fleustes, Spence Bate, Ann. and Mag. Nat. Hist., ser. 3, vol. i. p. 362. 



1859. ParamphUlioe (pars), Eruzelius, Skand. Amph. Gamm., p. 68. 



1860. „ „ Boeck, Forh. ved de Skand. Naturf. Sde M0de, p. 662. 

 1862. Fleustes, Spence Bate, Brit. Mus. Catal. Amph. Crust., p. 61. 



1865. ParampMtlw'e {pars). Goes, Crust, amph. maris Spetsb., p. 7. 



1866. Fleustes, Lilljeborg, On the Lysianassa magellanica, p. 18. 

 1870. Parawpliitlwe, Boeck, Crust. Amph. bor. et arct., p. 95. 

 1874. Fleustes, Buchholz, Die zweite Deutsche Nordpolarfahrt. 

 1876. „ Boeck, De Skand. og Arkt. Amph., pp. 299, 496. 

 1884. „ Schneider, Crust, og Pycn. Kvaenangsfjorden, p. 97. 



1886. „ Gerstaecker, Bronn's Klassen und Ordnungeu, Bd. v. Abth. ii. p. 503. 



Sars, who in 1876 named a species P^ews^es euacanthus, in 1885 re-named this species 

 Paramphithoe euacantha, and takes occasion to remark that he considers that the genus 



