PYCNOGONIDA— CALMAN. 



61 



Achelia bracei, sp. n. (Text-fig. 16). 



Occurrence.— Station 220, off Cape Adare, 45-50 fathoms; 46 ?, 16 $ (incl. 

 Holotype). 



Description.— T\\e specimens recorded under this name differ from A. communis 

 (Bouvier) (of which I have examined four specimens, presented to the British Museum 

 by Prof. Bouvier) only in the following characters : — 



(1) The somites of the trunk are defined dorsally only by more or less indistinct 

 g'rooves on the surface of the integument. Very often the groove between the first 

 and second leg-bearing somites, and less often that between the second and third, are 

 emphasised by differences of colour, but only in one single specimen do these two lines 

 appear to be marked by an actual fold of the integument giving a distinct double 

 outline, as in the specimens of ^4. communis. 



Fig. 16. — Achelia hrucei, sp. n., ovigevous Male. A. Dorsal view of body with chelophores, palps, and 

 first and second coxse. B. Lateral view of body with chelojshore, palp, and oviger. C. Third 

 leg of right side. 



(2) The chelophores fall far short of the middle of the proboscis. In the specimens 

 of A. communis that I have examined they reach the middle. 



(3) The antero-latcral tubercles of the cephalon are very slight or altogether absent 

 in the female, and much less prominent in the male than they are in ^4. communis. 



(4) The setae on the legs are less numerous. 



The value of these characters is somewhat discounted by the comments that 

 Bouvier makes on the variability of his species, but the constancy of the segmentation 

 of the trunk in the large number of specimens that I have examined suggests that this 

 character, at all events, is of specific value. 



The specific name is chosen in compliment to Commander Wilfred M. Bruce, 

 R.N.R.,. who, I am informed, gave valuable help in the operations of trawling and 

 dredging on board the " Terra Nova." 



