POLYCILETA BENHAM. 67 



The brown, stout heterogomphs are absent in the anterior feet of the specimen 

 from 157 fathoms. Is it a sexual mark ? 



In the 20th and subsequent feet the number of these stout bristles is reduced 

 to two. 



The appendix of the heterogomphs (figs. 73, 74) is knife-blade like, with long 

 fine hairs along its edge. The tip is hooked, and from the end an oblique line indicates 

 the margin of the " guard." 



The pharynx is peculiar in having no paragnaths, either in the oral or in the 

 maxillary divisions. The jaw (fig. 76) has sixteen rounded teeth, of which the five 

 distals are concealed by the brown edge of the jaw, as it lies on its side. 



Locality. 



Commonwealth Bay. Station 2, 318 fathoms (one); Station 3, 157 fathoms 

 (one); Station 10, 325 fathoms (one). 



Distribution. York Bay, Magellan Strait (Kinberg) ; East of St. Paul Island, 

 367-3 fathoms ; K. Wilhelm-II Land, 210 fathoms (Ehlers).* 



NEREIS AUSTRALIS Schmarda. 



Heteronereis australis Schmarda (1861), p. 101, pi. XXXI, fig. 242. 

 Platynereis magalhaenis Kinberg (1865), No. 2, p. 177. 

 Nereis Auslralis Benham (1909), p. 238, pi. IX, fig. 1. 



For a full synonymy and literature see Benham (1909, p. 238) and Fauvel (1916, 

 p. 484). The latter zoologist does not take the view put forward by myself that 

 Schmarda's species is synonymous with Kinberg's. I have gone into this matter pretty 

 fully in the above-mentioned article and I am still of opinion there expressed, although 

 Ehlers does not seem to have noticed the discussion, and has expressed no opinion as 

 to it in any of his recent works. 



Specimens of the worm were collected at various spots on the Macquarie Island 

 by Mr. H. Hamilton, to the number of sixty or more. He found it in rock pools, &c.; 

 it appears, therefore, to be a littoral species. Some of the specimens are filled with 

 reproductive cells, either male or female; but they exhibit no heteronereid changes. 



One male, preserved in formalin, has pale orange-brown colour, brighter 

 anteriorly, with grey feet. 



One specimen, at least, is still within its tube composed of black sand particles 

 and small stones. Gravier has described such a sandy tube for N. magalhaensis. 



A small individual, measuring 12 mm. in length, has paragnaths only in 

 compartments IV next the jaws ; the rest of the buccal surface is bare. 



* I have used Bell's estimate that one fathom is equal to 1-829 metres, as given in the "Discovery" Report: 

 footnote, p. 4. 



