POLYCILETA BENHA.M. 81 



Again, the ventral " cirrus " in the posterior feet, commencing on the 

 10th, undergoes reduction till it is a short obtuse " mamelon," which is not 

 true for S. mawsoni, where it does not begin to become smaller till at or about 

 the 50th segment. 



It seems, then, evident that there are two species of Scdoplos in these 

 southern waters. That of Mclntosh, Ehlers, and Fauvel on the one hand, and 

 the present species and that described by Gravier on the other. It remains 

 to be seen to which of these should be ascribed those recorded by Willey 

 (1902) under the title of Mclntosh's species. 



Family CIRKATULIDJE. 

 Genus CIRRATULUS Lamarck. 

 CIRRATULUS CIRRATUS 0. F. Mutter. 

 Miiller (1776), p. 214 (not seen.) 

 C. cirratus Malmgren (1867), p. 95. 

 Promenia jucunda Kinberg (1865), p. 254. 

 Promenia fulgida Ehlers (1897), p. 114, pi. VII, figs. 174-176. 



Cirratulus cirratus Fauvel (1916), p. 447 (where list of synonyms and biblio- 

 graphy will be found). 



Fauvel compared specimens from Falkland Islands, wh'ch agree in every feature 

 with Ehlers' Promenia fulgida, with the northern form, and was unable to detect any 

 constant differences between them. He therefore arrives at the conclusion tabulated 

 above. 



Members of the family are evidently rare in these southern seas, for Gravier 

 reports on only one Cirratulus sensu lato (1911), while Ehlers (1913) gives but little 

 information about the few that were collected by the German expedition, leaving 

 most of the fragments unnamed. 



The present collection includes a number of specimens from the Bpat Harbour, 

 and others from the Macquarie Island, some five or six in each gathering. 



Although well known from the Sub-antarctic region, all round the Pole, this is 

 the first time that it has been recorded from the Antarctic Sea. 







Localities. 



Boat Harbour, Commonwealth Bay, 2-4 fathoms. 



Macquarie Island (low water under stones and in rock pools); collected by 

 Mr. Hamilton. 



Distribution. South Georgia, Kerguelen, Magellan Strait, Fuegia, Falkland Islands; 

 and also Atlantic and Arctic Oceans. 



83892 L 



