663 



Meinert. In my opinion, however, it ought to be maintained as a distinct 

 species, differing, as it does, very markedly in the much shorter and stouter 

 body, as also in the less elongated superior antemice and pereiopoda. Unfor- 

 tunately only the male sex is as yet known. But as the males, as a rule, 

 are much more slender than the females, the female of this species would in 

 all probality exhibit a quite unusually short and compact form, and thereby 

 be well distinguishable from the female of C. septentrionalis. 



Occurrence. - Only a single male specimen has hitherto come under 

 my notice. It was taken, together with other species, at Bejan, in the outer 

 part of the Trondhjemsfjord. The specimen examined by Boeck, was from 

 the west coast of Norway, the exact locality not being stated. 



Distribution.. Kattegat (Meinert). 



11. Caprella aequilibra, Say. 



(PI. 2:38, fig. 3). 

 Caprella tcquilibra, Say, Journ. Acad. Philadelphia I. 



Syn. : Caprella Januarii, Krsyer. 

 Esmarkii, Boeck. 



monacantha, Heller. 



obesa, Haswell. 



Male. Body comparatively robust and perfectly smooth above, with 

 the anterior part (cephalosome -f 1st free body-segment) very much elongated, 

 occupying half the length of the body. Cephalou angularly produced in front. 

 First free body-segment fully as long as the 2 succeeding ones combined, 

 and having ventrally, between the bases of the posterior gnathopoda, an acute 

 projection, and on each side another spiniform process pointing anteriorly. 

 Eyes small, round. Superior antennae about half the length of the body, 

 joints of the peduncle rather expanded and covered with small spines, 3rd 

 joint nearly twice as long as the 1st, flagellum scarcely attaining the length 

 of the peduncle, and composed of about 11 articulations. Inferior antennae 

 about half the legth of the superior, and of the usual structure. Anterior 

 gnathopoda about as in C. Loveni. Posterior gnathopoda originating from 

 the posterior part of the corresponding segment, basal joint quite short, 

 propodos very large and oblong in form, tapering distally, palm but sparingly 

 setous, and exhibiting in front a triangular lobe succeeded by a very small 

 dentiform projection, denning angle well marked. Branchial lamellae of 

 moderate size and obovate in form. The 3 pairs of pereiopoda wanting 



