324 



fjord, in depths ranging from 50 to 100 fathoms. Boeck found a single speci- 

 men in the Christianiafjord and another at Haiigesund. Out of Norway it 

 has not yet been recorded. 



Gen. '.). (Ediceropsis, Lilljeborg, 1865. 



Body rather slender, with comparatively large coxal plates, the 4th 

 pair of which are deeply emargiuated posteriorly in their upper pai't, to 

 receive the 5th pair, which are of smaller size than usual. Cephalon narrowed 

 anteriorly, without however forming any produced frontal part. Eyes imper- 

 fectly developed, though conspicuous in the living animal, and placed, as in 

 most other Amphipoda, on the sides of the cephalon at some distance from its 

 anterior extremity. Antennae very unequal, the superior ones being extremely 

 small, whereas the inferior ones are strongly developed, with the penul- 

 timate joint of the peduncle very large, and the flagellum composed of numer- 

 ous short articulations provided anteriorly (in both sexes) with rather large 

 calceolce. Oral parts resembling those in the gemis Monocuhdes, except that 

 the mandibular palp is much more elongated, and the basal and masticatory 

 lobes of the maxillipeds broader in proportion to their length. Gnathopoda 

 rather powerful and subsimilar in structure, propodos in both pairs compa- 

 ratively large and subcheliform, with the palm obliquely arched and much 

 longer than the hind margin, carpus rather short, and forming inferiorly a 

 comparatively small setiferous lobe of same appearance in both pairs. The 

 2 anterior pairs of jiereiopoda very slender and much smaller than the 3 

 succeeding pairs, which are very fully developed and increase successively in 

 length. Uropoda of the usual structure. Telson very small. 



Remarks. — The present genus, established by Prof. Lilljeborg, is very 

 markedly distinguished from the typical (Ediceridse by the form of the 

 cephalon. and by the eyes not being placed dorsally, but on each side of it. 

 Moreover the structure of the antennae is rather peculiar, as also the form 

 of the 4th pair of coxal plates. Finally the 3 posterior pairs of pereiopoda 

 increase successively in length, the last ones being thus less unlike the preced- 

 ing pairs than is usual in this family. The genus comprises as yet but a 

 single species, to be described in the sequel. 



