166 



vaulted , almost square protubeiance, which in a lateral view of the trunk makes it appear 

 very different from other species. The fiontal border is considerably produced, the larger 

 median part of the margin is slightly cuived, naked, sepaiated by a rather deep incision 

 from a lower, evenly lonnded lobe which extends to the angle close in front of the base of 

 the antennula; this lobe is much thinner than the remainder of the frontal border and 

 supplied with very short marginal hairs. The antennulse are modeiately short, 3-jointed, 

 with short setae. The antenna? are very short, probably only 1-jointed, with a short seta. 

 The mouth rather large, the mouth-border of medium breadth. Maxillulse normal, with a 

 long additional branch. The basal joint of the maxillse is small and smooth, the two 

 following joints (as in most other species) are coalescent. Maxillipeds fairly small, with the 

 normal proportion between the joints; the basal joint is slender, provided on the anterior side 

 with some hairs at both ends ; the last joint is sligthly digitated at its end. The sub-median 

 skeleton has t\\'o pairs of processes, the first pair robust, the second pair rather short 

 and strongly diveiging; the part between the maxillae and the maxillipeds is furnished with 

 numerous moderately short hairs. The above-mentioned boundary of the hair-covering between 

 the head and the trunk has a pretty narrow belt of rather short hairs and dorsally of hairs 

 of medium length; the back, the sides and the posterior end of the trunk are furnished with 

 extremely short hairs, and this covering reaches ventrally to the second pair of legs and 

 to the protuberance on the posterior half of the trunk ; the anterior ventral half is naked, 

 except a pretty good-sized transverse area stretclung from the first pair of legs to the 

 lateral margin which is furnished with rather short hairs, and finally, the protuberance 

 is covered nearly all over with pretty similar hairs. The trunk-legs very small, each 

 consisting of two generally somewhat oblong joints of about equal size and ending in one 

 or two setas which are of the same length or a little shorter than the leg. Each of the 

 posterior angles of the afore-mentioned protruding ventral part is produced into several 

 rather short, usually rounded eminences and processes, some of which are very thick, others 

 fairly slender; the stoutest of them bears a single pretty long, tliick seta, and on the po- 

 sterior part of the protuberance, closely inside of the innermost eminence of the posterior 

 angles, we find a short, oblong caudal stylet jointed on; the two stylets accordingly being 

 very far apart. (Spermatotheca; appear underneath the foremost third of the protuberance). 



OVISACS. They are middle-sized, shortly ovate (fig. 2 c) or sub-globular, but slightly 

 differing in size; the largest specimen is 16 mm., the smallest 13 mm. in length. The eggs 

 comparatively small and numerous. 



LARVA and POST-LARVAL DEVELOPMENT. Unknown. 



HABITAT. The maz'supium of Janira spinom Harg. from the Davis Straits at 

 lat. 66» 32' N., long. 55" 34' W., 100 fathoms; Th. Holm ^/vii 1884. In a specimen 

 occurred: one female, two males and twelve ovisacs, two of them with eggs and two with 

 Nauplii. 



