12 Alf Wollebæk. [No. 12 
The tip of the propodos (fig. 4, VI) carries several rather eoarse ser- 
rated bristles which were not present on the 3rd pereiopod. Other- 
wise this limb corresponds very elosely in regard to structure and 
relative length of joints with the 3rd pereiopod. 
5th Pereiopod is of the same length as the 2nd, 22 mm., 
ånd is the weakest of the five. The tip of propodos ends in å very 
short, bluntly rounded, finger-shaped prolongation (fig. 5, VI, 6./2), 
on which there appears an extremely rudimentary chela. In the 
males vas deferens (fig. 6, VI, vd) will be found as usual opening on 
the inner side of the coxa of this leg. 
Branchiae (Pleurobranchiae wanting). The branchiae on the 
2nd and 3rd maxillipeds have already been mentioned when dis- 
cussing those &nathopods. For each of the pereiopods, if we except 
the fifth, we find å pair of arthrobranchiae—one on either side. 
These are considerably larger than either the mastigobranchiae or 
the podobranchiae and increase very slightly in size from front to 
rear. 'The podobranchiae are, as shown in the illustration, (P1. ID) 
a good deal smaller than the arthrobranchiae: the mastigobranchiae 
fairly long, but extremely narrow and without small branehes. 
Mastigobranchiae are found on all the pereiopods except the fifth, 
but podobranchiae are only present on the first three. The number 
and distribution of the branchiae from the 2nd maxilliped to the 
5th pereiopod may be seen in the table on page 17. 
st Pileopod (fig. 1, VII) is not found in all specimens. It 
is short, unbranched, articulations indistinet, covered with very long 
plumose setae. Its length is approximately equal to that of the 
branches of the succeeding pleopod. 
2nd Pleopod (fig. 2, VII). Pedunele rather shorter than the 
branches: total length 6 mm. in å specimen 57 mm. long. Of the two 
branches the inner one is slightly longer than the outer, and in the 
case of males is provided with two, in the case of females with only 
one appendix (*stylamblys” Sr. B.) (fig. 2,a.i &a.m). Of the male”s 
two appendices appendix imterna is nearly twice as long as the 
other, appendix masculina. The tip of the former is furnished 
with å group of small hooks (*cineinnuli” G. O. Sars) (ce). The inner 
appendix is covered with plumose setae similar to those on the 
branches. 
