3 Alf Wollebæk. [No. 12 
This branch is densely covered with setae along the whole lower 
side and outside, both in its anteriorly-directed and posteriorly- 
directed prolongations. It corresponds with what G. O. Sars and 
other authors designate the exognath. 
1st Maxilliped (Jawfoot, 3rd Siagnopod or Srd Maxilla; 
fig. 3, IV) consists, like the preceding, of four branches as well as 
the mastigobranchial lamella. 
1st braneh, which in the 2nd maxilla is bi-lobed, has also in 
the 1st Maxilliped an indication of this: seeing that on the inner 
edge there is å quite short rounded expansion. 
2nd branch, on the other hand, which is considerably longer 
and broader than the first, is not bi-lobed. Both branches are 
nearly everywhere thickly furnished with setae along the inner 
edge, as was also the case with the 2nd maxilla: and the nd 
branch is likewise furnished with å row of shortish stiff spine-like 
setae. 
3rd branch is small and weak: and is completely hidden by 
the second branch, if we examine the maxilliped from below. It 
consists of three joints, and has its basal portion very short, its 
second joint somewhat shorter than the distal joint, and the tip of 
the distal joint furnished with two thin setae. The whole braneh 
is rather shorter than the preceding one. 
4th branch or ecphysis is longer than any of the others, is 
of equal breadth throughout, somewhat curved, distally rouuded, 
and with å narrow projection united by a somewhat faintly marked 
artieulation to the branch. This projection is provided at the tip 
with two thin setae. The outer edge in particular of this braneh 
is regularly and finely dentated. Both edges are densely clad with 
setae. The mastigobranchial lamella (epignath G. O. Sars and 
others) has a largish posteriorly-directed and å smaller anteriorly- 
directed tapering portion. The distal tapering portion is furnished 
along the edges with åa number of small uneiform setae, while setae 
of a similar nature though fewer in number are to be found on the 
posterior lamella of the mesognath. In the specimens examined by 
me the distal and proximal portions seem to be united by å faintly- 
marked articulation. | 
2nd Maxilliped (= 1st Gnathopod, fig. 4, IV) is subpediform. 
It consists of a seven-jointed stem an ecphysis and branchiae. The 
y 
