659 



7. Caprella septentrionalis, Kroyer. 



(PI. 237, fig. 1.) 



Caprella sepientrionalis, Kroyer, Nat. Tidsskr. 1 ser. Vol. 4, p. 645; PI. Vill, figs. 10 — 19. 



Syn.: Squilla lobata, Fabricins. 

 » Caprella cercopokles, White. 

 > — longicornis, Boeck. 



Body somewhat more strongly built than in the preceding species, 

 and having the back smooth, or with only slight traces of obtuse tuberculiform 

 prominences; the anterior part in male considerably more ])rolonged than in 

 female, though scarcely exceeding in length the 2 succeeding segments com- 

 bined. Cephalosome much shorter than the succeeding segment, and having 

 in front of the cervical impression an obtuse tubercle, which sometimes appears 

 bifurcate at the tip. Eyes small, round, with dark red pigment. Superior 

 antennae in female scarcely attaining half the length of the body, 3rd joint 

 of the peduncle somewhat shorter than the 1st, flagellum not attaining the 

 length of the peduncle, and composed of about 16 articiilations ; those in 

 male comparatively more elongated, with tlie joints of the peduncle somewhat 

 expanded and ciliated on the edges. Inferior antennae in female about Vs as 

 long as the superior, in male scarcely half as long, and of the usual struc- 

 ture. Anterior gnathopoda nearly as in C. linearis. Posterior gnathopoda in 

 female having the propodos somewhat larger, otherwise of a shape very similar 

 to that in the above-mentioned species ; those in male attached somewhat behind 

 the middle of the corresponding segment, and much stronger than in female, 

 basal joint comparatively short, propodos exceedingly large and rather broad 

 at the base, tapering distally, palm densely setous, with a small dentiform 

 projection beyond the middle and an angular lobe in front, defining angle 

 rather projecting, dactylus very strong and abruptly curved in its outer part. 

 Branchial lamellae in female of moderate size and obovate in form, in male 

 very large and rounded oval. The 3 pairs of pereiopoda rather strong, with 

 the propodal joint considerably dilated in the middle, palm not nearly occupy- 

 ing 73 of the length of the joint, and defined by a somewhat projecting angle 

 carrying 2 juxtaposed spines. Body of a pale greenish hue, changing to 

 olive-brown, and mottled all over with small dark specks. Length of adult 

 female reaching 19 mm., of male 27 mm. 



Remarks. — This form was first described by Kroyer under the above 

 name. It is most probable that the Squilla lobata of Fabricius refers to the 

 present species, and this is also the case with C. cercojjoifles of White. The 

 C. Jonyicornis of Boeck scarcely difiers from males of the present species, 



