PYCNOGONIDA— CALMAN. 



13 



Measurements, in mm. — 



Length of proboscis . 

 Greatest diameter of prol^oscis 

 Length of trunk 



Width across first Lateral processes 

 Length of abdomen . 



Third right leg — 



Coxae 

 Femur 

 First tibia . 

 Second tibia 

 Tarsus 

 Propodus . 

 Claw 



Palp- 

 Second segment 

 Third 

 Fourth 

 Fifth 

 Sixth 

 Seventh 

 Eighth 

 Ninth 



Remarks. — In the relative lengths of the distal segments of the palp this species 

 approaches the group of species related to C. angusta, but it differs widely from these 

 not only in the much greater size of the proboscis, but also in the approximation of the 

 lateral processes, in which respect it differs from all the " longitarsal " species except 

 C. 'proboscidea and the new form descril^ed below as C. wilsoni. Among the species of 

 this genus the curious chelate termination of the ovigers is only paralleled, so far as I 

 know, in C. australis, but a similar condition is found in DiJhmia chelata (Bohm) and 

 Ehopalor/iynehus tenuissimus (Haswell). The labial teeth are found in various degrees 

 of retraction in preserved specimens of other species, and the widely gaping mouth of 

 the specimens described above is partly due to this condition ; but I think that the 

 teeth themselves are unusually small and the triangular mouth-frame is relatively 

 larger than in any species with which I have compared it. 



The name of this, one of the largest species of Pycnogonida yet brought from 

 Antarctic seas, is chosen to commemorate the heroic and ill-fated Leader of the 

 Expedition by which it was obtained. 



