651 



FcmarJcs. — The present genus, established by Kreyer, is nearly allied 

 to the preceding one, yet differing very markedly in the absolute want of 

 any rudiments of anterior pereiopoda, and in the iirosome being provided 

 with 2 pairs of distinct appendages (uropoda). The genus comprises as yet 

 only 3 species, viz., y7^. hngicornh Kroyer, Jl<]. sjtinosissima Stimps., and 

 Jl'J. ccliinata Boeck. The last named species only belongs to the fauna of 

 Norway, and will be described below. 



3. /Eglna echinata, Boeck. 



(PI. 234, fig. 2). 

 JEgina echinata, Boeck, Crust, ampli. bor. & arct. p. 191. 



Body rather slender, and densely armed with comparatively short 

 spines, some of which, generally an-anged in pairs along the dorsal face, are 

 somewhat larger than the others. Cephalosome a little shorter than the 

 succeeding segment, and having in front of the cervical impression 2 jiixtaposed 

 spines. The last 2 segments comparatively short and nearly equal-sized, 

 each with 2 juxataposed dorsal projections. Lateral spines as in ProteUa 

 phasma. Eyes small, orbicular. Superior antennae scarcely attaining the 

 length of the hody, 2nd joint of the peduncle the longest, 3rd joint much 

 longer than the 1st, flagellum shorter than the peduncle. Inferior antennge 

 scarcely half as long as the superior, and having a dense clothing of short 

 bristles posteriorly, flagellum small, biarticulate. Anterior gnathopoda with 

 the carpus expanded below to a rounded setiferous lohe, propodos exceeding 

 the carpus in length, and oval triangular in form, palm straight and defined 

 behind by an obtuse angle carrying a .short spine. Posterior gnathopoda 

 with the basal, ischial and meral joints produced at the end to acute pro- 

 jections, propodos very large, oblong oval in form, with the palmar edge 

 divided into 2 distant acute projections, the posterior tipped by a spine, the 

 anterior defined in front by a narrow sinus, end of the propodos produced 

 above the insertion of the dactylus to a conical process and below it to an 

 angular lobe, dactylus strong, and curved. Branchial lamellae of moderate 

 size, and oboval in form. The 3 pairs of pereiopoda successively slightly 

 increasing in size, propodal joint in all rather strong and somewhat expanded 

 in its proximal part, palm minutely spinulose, and defined by a slight pro- 

 jection carrying 2 juxtaposed spines. Urosome less rudimentary than in the 

 species of the genus ProteUa, anterior pair of uropoda much larger than the 

 posterior, with the terminal joint about the length of the basal one, and oval 



