PYCNOGONIDA. 
3 
Leionympkon clausii, Pfeifer. 
„ australe . 
,, glaciale . 
„ spinosuna 
Ammothea koeki, Pfeifer 
„ wilsoni, Sckimkewitsck 
„ communis, Bouvier 
„ curculio, Bouvier 
Tanystylum styligerum, Miers 
„ dokrnii, Pfeifer . 
„ ckierckise, Scliimkewitscl 
* Ausfcrodecus glaciale 
* Austroraptus polaris 
Ascorkynckus glaber, Hoek 
* Rkynckotkorax australis 
Colossendeis gigas, Hoek 
„ leptorkynckus, Hoek 
„ gigas leptorkynckus, Hoek 
„ megalonyx, Hoek 
,, robusta, Hoek 
„ gracilis, Hoek 
„ australis 
., glacialis 
„ frigida . • 
„ rugosa 
Deeolopodaf australis, Eigkts 
„ antarctica, Bouvier 
Antarctic. Sub-Antarctic. 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
,x 
X 
X 
X 
X 
X 
No less than seven expeditions have taken part in the recent “ Siege of the 
South Pole,” and the collections of Pycnogonids made by four of them still remain 
unpublished. This being the case, it is scarcely desirable to enter into a discussion 
on the geographical distribution of these animals. It may, however, be stated that 
the head-quarters of these animals appears to be in southern seas. Professor Mobius 
(22) has compiled a list of the known Arctic and sub-Arctic species, which 
number forty-two. In the same work, for comparison, he has added a list of all 
the species taken beyond 30° South latitude. Only thirty-one species are included 
in this large area, and the genus Tanystylum is the only one occurring in the south 
which does not occur in the north. I have reduced the Southern or Antarctic area 
to what I consider more reasonable dimensions, and the ‘ Discovery : collection, with 
its predecessors, raises the total to sixty-three species. Among these species there are 
five new genera ; four of these are, as far as is yet known, confined exclusively to 
the Antarctic region, the other extends well into the sub-Antarctic region. The 
“ Bipolarity Theory ” is only affected by a single species, Colossendeis australis. Of 
all the numerous species of this genus, C. proboscidea, from the north, and C. australis, 
from the south, stand apart from all the rest on account of their bodily form, and 
there can be no question that they are much more nearly related to each other than 
t [As Eights said his species had “ five perfect pairs ” of legs he doubtless meant to write Decaholopoda. —Ed.] 
