66 AUSTRALASIAN ANTARCTIC EXPEDITION. 



axis slightly oblique to a transverse line; they face upwards and backwards. The 

 anterior pair, of which only the upper half is visible from above in this specimen, faces 

 forwards and outwards. The posterior pair is close to the hinder margin, the anterior 

 separated from them by about the diameter of an eye. 



The tentacles are about half the length of the prostomium in one case ; nearly 

 equal to it in the less well preserved specimen. The palps are broad and short, with a 

 nearly spherical appendage, and do not reach further forwards than the tips of the 

 tentacles, or only slightly further. 



Of the peristomial cirri, the longest, i.e., the anterior dorsal, reaches back to the 

 7th or 9th segment, and is from 8 to 10 mm. in length; the next, antero- ventral, is about 

 half this length, and the other two are successively shorter, the shortest being of the 

 same length as the prostomium plus its tentacles. 



The peristomium is rather longer than the first cheetigerous segment and about 

 equal to the second; it has a straight anterior margin. 



The parapods are relatively short : and present a peculiarity that I do not 

 remember seeing noted in other species. The posterior lip of the neuropod is produced 

 outwards into an ovate process, very distinctly constricted at its base, and though 

 normally directed outwards, is sometimes displaced backwards. It occupies the position 

 of one of the folia ^eous outgrowths characteristic of the Heteronereid stage of some 

 species (fig. 69). 



In the anterior feet, up to about the 22nd, the upper ligule is bluntly pointed, 

 no longer than the dorsal lip or " middle ligule." The lip of the ventral lobe is bluntly 

 rounded and carries, as I have mentioned, the curious appendage on its posterior face. 

 The ventral ligule is rounded and shorter and broader than the ventral lip, and this 

 seems to be a specific character (fig. 70). 



Posteriorly, at or about the 34th foot (fig. 71), the upper ligule becomes rather 

 more pointed, as does also the middle ligule; the ventral ligule remains broadly rounded, 

 and is even larger than anteriorly. 



In the still more posterior feet (fig. 72) this ventral ligule is still more noticeable 

 as a large rounded lobe, larger than any of the other lobes. 



The chaetse are arranged as follow in the anterior feet : 

 Dorsal bundle. About 12-15 spinigerous homogomphs, with long slender appendix. 



Ventral bundle. (a) Supra-acicular group : 6-8 spinigerous homogomphs, as 

 above, together with 3-4 stout-shafted, brown, falcigerous heterogomphs with 

 a shorter appendix.* (b) Sub-acicular group : A few spiniger homogomphs and 

 16-18 heterogomph falcigers with slender colourles shaft. 



The appendix is short only as compared with that of the homogomphs ; it is longer than the usual short falciger. 



