460 



rostral projection very small, lateral corners short, and transversely truncated 

 at the tip, being defined below by a small notch, postantennal ones forming 

 on each side a triangular lobe partly obtecting the basal joint of the inferior 

 antennae. Anterior pairs of coxal plates considerably deeper than the body; 

 1st pair but very slightly widening distally; the 2 succeeding ones oblong 

 quadrangular in form; 4th pair rather expanded in their outer part, and 

 produced posteriorly, below the emargination, to an acute-angled projection; 

 5th and 6th pairs rather broad, with the posterior lobe deeper than the 

 anterior. Epimeral plates of metasome comparatively large; last pair nearly 

 rectangular, with the posterior edge but slightly curved. Eyes only very 

 faintly traced in alcoholic specimens. Superior antennae (in female) nearly 

 attaining the length of the whole body, 1st joint of the peduncle about the 

 length of the 2 outer ones combined, flagellum extremely slender and elongated, 

 about 5 times as long as the peduncle. Inferior antennae much shorter than 

 the superior, last joint of the peduncle exceeding in length the penultimate 

 one, flagellum not quite twice the length of the peduncle. Anterior gnatho- 

 poda with the carpus slightly expanded distally, and forming below a short 

 setous lobe, propodos about same length, but much narrower, and scarcely at 

 all widening distally, being clothed inferiorly with numerous fascicles of 

 short bristles, palm nearly tranverse and quite short, dactylus extremely 

 small. Posterior gnathopoda of a similar structure, but much more elongated, 

 having both the carpus and the propodos extremely narrow and produced, 

 and clothed inferiorly with fascicles of small bristles. Pereiopoda very slender 

 and brittle, being edged with slender spinules, basal joint of the 3 posterior 

 pairs oblong oval in form, with the posterior edge perfectly smooth, that of 

 last pair, as usual, much the largest. First pair of uropoda much larger 

 than the 2nd; last pair reaching about to the tip of the latter, and having 

 the outer ramus about half as long as the inner. Telson oval quadrangular 

 in form, tip obtusely truncated, with a very small notch in the middle. 

 Colour in the living state of the animal not yet stated. Length of adult 

 female 10 mm. 



Eenuirl^. As above stated, the present form was erroneously 



described by Boeck as a species of his genus Ampliitlwpsis, to which genus it, 

 in fact, bears only a very remote affinity. It is easily distinguished from 

 any of the other forms belonging to the present family, by the extremely 

 slender and unequal-sized gnathopoda. In the latter respect, it somewhat 

 resembles the form described by the Rev. Mr. Stebbing from the Challenger 

 Expedition as Atyloicles serntlk-nmla, but is otherwise very different. 



Occurrence. I have only seen a few specimens of this form, which 

 were f-ollcctod in 3 different localities of the Norwegian coast, viz., in the 



