PYCNOGONIDA. 



Leionymplion clausii, Pfeffer. 



* „ australe . 

 ■ „ glaciale . 



„ spinosum 



Ammothea hoeki, Pfeffer 



„ wilsoni, Schimkewitsch 



„ communis, Bouvier 



„ curculio, Bouvier 



Tanystylum styligerum, Miers 

 „ dohrnii, Pfeffer . 



„ chierchise, Schimkewitsch 



* Austrodecus glaciale 



* Austroraptus polaris 

 Ascorhynchus glaber, Hoek 



* Ehyuchothorax australis 

 Colossendeis gigas, Hoek 



„ leptorhynchus, Hoek . 



„ gigas leptorhynchus, Hoek 



„ megalonyi, Hoek 



„ robusta, Hoek 



„ gracUis, Hoek 



* „ australis 



* „ glacialis 



* „ frigida 



* „ rugosa 

 Decolopodaj australis, Eights 



„ 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 



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 unpublished.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. prohoscidea, 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 the^ 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.] 



