653^ 







that in the genus Caprella. Besides the Norwegian species described below, 

 Boeck opines that the 2 species JEyina tenella and aculrata of Dana may 

 belong to this genus. 



4. /Eginella spinosa, Boeck. 



(PL 235, fig. 1). 

 JEginella spinosa, Boeck, Crust, amph. bor. & arct. p. 192. 



Body comparatively strongly built, with the cephalosome unusually 

 short, scarcely exceeding half the length of the succeeding segment, and armed 

 with 2 dorsal spines, the anterior placed quite in front, the posterior immediately 

 behind the cervical suture, the latter being very long and curving anteriorly. 

 Second segment of mesosome with 2 strong, juxtaposed dorsal spines in front of 

 the middle, and another near the posterior end; the succeeding segments each with 

 2 pairs of somewhat smaller dorsal spines and a single one at the posterior 

 extremity; the last 2 segments each with 2 juxtaposed dorsal spines about in the 

 middle. Lateral spines wanting. Eyes small, orbicular, with dark red pigment. 

 Superior antennae but little exceeding half the length of the body, 2nd joint 

 of the peduncle the longest, 3rd joint scarcely longer than the 1st, flagellum 

 somewhat exceeding in length the peduncle, and composed of numerous arti- 

 culations. Inferior antennae scarcely half the length of the superior, and 

 very narrow, flagellum small, biarticulate. Anterior gnathopoda as in JEgina 

 ecliinata. Posterior gnathopoda in female very powerfully developed, meral 

 joint forming below an obtuse projection, propodos exceedingly large and 

 tumid, with the upper edge boldly curved and terminating in front in a small 

 conical projection, lower edge forming at the base a triangular lobe tipped 

 by a small spine and defining the palm posteriorly, this last being produced in 

 front to an angular lappet, behind which occurs a small dentiform projection, 

 dactylus very strong and falciform ; posterior gnathopoda in male somewhat larger 

 than in female, with the palmar edge of the propodos densely setous, and the 

 dentiform projection more produced. Branchial lamellae of moderate size, 

 narrow oblong in form. The 3 pairs of pereiopoda well developed, with the 

 propodal joint about twice the length of the carpal one, and produced at the 

 base to a distinct projection defining the palm. Body of a light yellowish 

 hue, more or less variegated with a dark brown pigment. Length of adult 

 female 15 mm., of male about the same. 



Remarks. This form was already anounced by Boeck in the year 

 1860, at the meeting of the Scandinavian naturalists in Christiania, and was 



86 Crustacea. 



