391 



ing the 1st joint .somewhat laminar. Inferior antennae in female a little 

 longer than the superior, the last 2 joints of the peduncle much prolonged 

 and finely hairy at the edges, flagellum about half the length of the pe- 

 duncle; those of male attaining the length of the whole body, flagellum very 

 slender, filiform, and composed of numerous short articulations. Anterior 

 gnathopoda with the propodos scarcely half as long as the carpus, and oblong 

 triangular in form, gradually expanding distally, palm well defined and, 

 like the tip of the propodos in front of the insertion of the dactylus, 

 densel3' clothed with extremely delicate bristles. Posterior gnathopoda 

 considerably more elongated, and having the propodos longer and narrower. 

 Basal joint of the 3 posterior pairs of pereiopoda considerably expanded, 

 and coarsely serrated along the hind edge, that of last pair miich the 

 largest, and subrhomboidal in form. Last pair of uropoda with the inner 

 ramus a little longer than the outer, both setous on the inner edge. Telson 

 much elongated, and lanceolate in form, cleft extending considerably beyond 

 the middle, terminal lobes pointed, and each having exteriorly, near the tip, 

 a small bristle. Body of somewhat vainable colour, being more or less densely 

 variegated with yellow, white, and pink, coxal and epimeral plates, as also 

 the basal joint of the 3 posterior pairs of pereiopoda generally tinged with 

 a beautiful coral-red ; antennae and legs banded with reddish orange. Length 

 of adirlt female reaching 10 mm. ; that of male considerably less. 



BeniarJis. — This form cannot be confounded with any other of the 

 northern Amphipoda, being prominently distinguished, both by its general 

 habitus and by the structirre of the several appendages. From the 2 exotic 

 species mentioned above, it distinguishes itself conspicuously by the form and 

 armature of the last pair of epimeral plates of metasome, as also by the 

 strongly serrated edges of the posterior segments. 



Occurrence. — Of thi coast off Norway, this form is far from being 

 rare, occurring, as it does, from the Christianiafjord up to Vadso. I have 

 collected it in nuinerous localities, sometimes even in great abundance, from 

 depths ranging from 80 to 100 fathoms. It is also occasionally met with in 

 less great depths up to 20 fathoms, but may on the whole be regarded as a 

 true deep-water form. 



Distrihution. — Grreenland (Hansen), Spitsbergen (Goes). 



Gen. 2. SyrrhoiteS, G. 0. Sars, n. 



Body comparatively stout and somewhat compressed, with strongly 

 incrnsted integuments, and some of the segments elevated dorsally to triangu- 



