325 



24. Ediceropsis brevicornis, Lilljeborg. 



(PI. 114). 

 (Ediceropsis brevicornis, Lilljeborg, On the Lysianassa magellanica etc., p. 19. 



Body glabrous and somewliat compressed, but without any dorsal keel. 

 Ceplialon exceeding in length the first 2 segments of mesosome combined, anterior 

 part rather narrowed and produced in front to a very small rostral projection, 

 lateral corners forming a short and broad lobe emarginated at the end. First pair 

 of coxal plates rather expanded distally, and much broader than the succeeding 

 pair, terminal edge slightly curved and densely setous ; 4th pair much deeper 

 than the corresponding segment, and very broad in their outer part, forming 

 posteriorly, below the emargination a rather projecting narrowly- rounded 

 lobe; 5th pair scarcely half as deep as the 4th, and having the posterior lobe 

 obtusely truncated at the tip. Eyes rounded triangular, without any distinct 

 lenses, pigment light red. Superior antennae very minute and densely setous, 

 considerably shorter than the cephalon, and scarcely reaching beyond the 

 middle of the penultimate pediincular joint of the inferior ones, joints of 

 the peduncle rapidly diminishing in size, flagellum somewhat shorter than the 

 peduncle, and composed of about 10 short articulations. Inferior antennae 

 more than 3 times as long as the superior, and rather strongly built, basal 

 part forming posteriorly a large globular expansion projecting beneath the 

 cephalon, in front of the buccal area, penultimate joint of the peduncle very 

 large and muscular, having, in addition to a few small bristles, a slender 

 spine at the end posteriorly, last joint of the peduncle scarcely more than 

 half as long as the penultimate one and much narrower, having on the anterior 

 edge 3 slender spines and posteriorly at the end 2 similar ones, flagellum 

 shorter than the peduncle and very flexible, being composed of a great 

 number of short articulations, each bearing anteriorly a rather large calceola. 

 Mandibular palp nearly twice as long as tlie mandible, with the tei'minal 

 joint shorter than the middle one. Anterior gnathopoda with the pro- 

 podos nearly as long as the basal joint, and regularly oval in form, palm 

 slightly arcuate and nearly 4 times as long as the hind margin, its 

 edge densely clothed with small spinules and bristles, carpal lobe small 

 and densely setous, reaching to the palm of the propodos. Posterior 

 gnathopoda of almost exactly the same structure as the anterior ones, being 

 only a little more elongated, and having the piopodos more oblong in 

 form. The 2 anterior pairs of pereiopoda very slender and densely setous, 

 propodal joint shorter than the carpal one, and about the length of the meral 

 joint, dactylus very slender, and equalling the latter joint in length. The 2 



