On Decalopoda australis, Eifihts. 41 



The tarsus is longer than the propos, but the two together 

 are shorter than the femur. 



On the dorsal extremity of the femur are five minute 

 spines, one median, and a pair on each side separated from 

 the median one by a considerable interval. On the first 

 tibia there are no spines at all, but traces of them exist 

 in one specimen. 



On the second tibia, and the tarsus at the distal extremity, 

 are two pairs of long spines situated ventro-laterally. A 

 pair of spines exists at the extremity at the propos under- 

 neath the claw. 



All these spines are tolerably regular in their occurrence, 

 but one may be absent or reduced in size, and an additional 

 one may be present. The median spine on the ventral 

 surface of the three terminal joints is advantageously 

 missing, but this turns up in one or two instances. 



The generic differences between Peritanymplion and Decalo- 

 poda are too obvious to need special mention. Pentanym'phon, 

 without the extra pair of legs, could hardly be separated 

 from Nymphon except by a series of minute characters which 

 seems to find favour at the present day. Decalopoda, on the 

 other hand, is distinct from all known genera, but is most 

 nearly allied to Colossendeis. The well-developed three- 

 jointed mandibles separate it sharply. The palps, more 

 particularly the ovigerous legs, together with the ill-defined 

 segmentation of the body, place it unquestionably in close 

 relation to that genus. 



Fifteen specimens of this interesting species were taken at 

 Station 325 between May and August 1903, in 9 to 10 

 fathoms, Scotia Bay, South Orkney Islands. 



Eights says : " They are to be found in considerable 

 numbers in connection with the fuci thrown up by the 

 waves along the shores of the islands, after being detached 

 by the motion of the large masses of ice, from the bottom 

 of the sea." 



He further speaks of having obtained many specimens, all 

 being furnished with " egg-bearing organs." 



My best thanks are due to Mrs L. E. Sexton for the great 



VOL. XVI. E 



