445 



7. Apherusa Jurinii (M-Edw). 



(PI. 157, tig. 1). 



Amphitlini: Jurinii, M-EJwards, Ann. Sciences Nat, 1830. Vol, XX, p. 370. 



Syn.: Anipbithoi' norvegica, Rathke. 



» Param]ihitlioe norvegica, Bruzel. 



> Pherusa fucicola, Sp. Bate (part). 



> Calliopius norvegicu^, Boeck. 



Body rather slender, and having the back evenly rounded throughout, 

 ■without any dorsal projections. Cephalon not very large, about equalling in 

 length the iii'st 2 segments of mesosome combined, rostral projection quite 

 short, lateral corners broadly rounded, postantennal ones not much produced. 

 Anterior pairs of coxal plates of moderate size, about as deep as the body, 

 and .successively increasing to the 4th pair, which are rather expanded 

 distally, with the posterior edge deeply emarginated above, and produced 

 below the emargination to an acuminate projection. Last pair of epimeral 

 plates of metasome forming a broadi.sh expansion, the inferior corner of which 

 is dentiform, the superior one triangularly produced, edge of the projection 

 quite smooth. Eyes of moderate size and oval reniform in shape, visual 

 elements well developed, pigment dark brown. Superior antennae about 

 equalling in length Vs of the body, 1st joint of the peduncle rather thick, 

 and not quite attaining the length of the other 2 combined, flagellum twice 

 as long as the pediincle, and composed of 26 — 28 articulations bearing fascicles 

 of delicate bri.stles. Inferior antennae exceeding the superior by about Vs of 

 tlieir length, peduncle rather densely setous on both edges, flagellum more 

 than twice its length. Gnathopoda of the usual feeble structure, propodos 

 however somewhat dilated in the middle, nearly subfusiform in shape, and 

 considerable longer than the carpus, palm somewhat oblique, though scarcely 

 exceeding in length the hind margin. Pereiopoda comparatively rather strongly 

 built, with hook-shaped dactyli, basal joint of the 3 posterior pairs rather 

 expanded, and having the posterior edge quite smooth, that of last pair, as 

 usual, much the largest. Last pair of uropoda extending but little beyond 

 the others, rami narrowly lanceolate, and edged with slender spines. Telson 

 oblong triangular, not quite twice as long as it is broad at the base, tip 

 obtusely pointed, and having on each side 2 very small spinules. Body light 

 straw-coloured, and variegated all over with irregular flexuous patches of a 

 clear reddish-oi*ange pigment. Length of adult female scarcely attaining 8 mm. 

 Ri'mdrly. — This form was at first announced by M-Edwards in the 



58 — Crustacea, 



