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vaulted, almost square protuherance, which in a lateral view of the trunk makes it appear 
very different from other species. The frontal border is considerably produced, the larger 
median part of the margin is slightly curved, naked, separated by a rather deep incision 
from a lower, evenly rounded lohe 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 antennule are moderately short, 3-jointed, 
with short sete. The antennz are very short, probably only 1-jointed, with a short seta. 
The mouth rather large, the mouth-border of medium breadth. Maxillule normal, with a 
long additional branch. The basal joint of the maxilla 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 two pairs of processes, the first pair robust, the second pair rather short 
and strongly diverging; the part between the maxille 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 stretching 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 sete 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, thick 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. (Spermatothece: appear underneath the foremost third of the protuberance). 
OVISACS. They are middle-sized, shortly ovate (fig. 2c) or sub-globular, but slightly 
differing in size; the largest specimen is 1°6mm., the smallest 1°3mm. in length. The eggs 
comparatively small and numerous. 
LARVA and POST-LARVAL DEVELOPMENT. Unknown. 
HABITAT. The marsupium of Janira spinosa Harg. from the Davis Straits at 
lat. 66° 32 N., long. 55° 34‘ W., 100 fathoms; Th. Holm °/vi 1884. In a specimen 
occurred: one female, two males and twelve ovisacs, two of them with eggs and two with 
Nauplii. 
