416 DR J. H. ASHWORTH 



me his specimen, and I am able to add some details to those given in his short 

 account of it. This worm was taken at low water on the east coast of Petermann 

 Island (lat. 65° 11' S., long. 64° 10' W.), off Graham Land, on 31st October, 1909. 

 The specimen is in two portions ; the anterior region is moderately well preserved, 

 but the posterior portion is very fragile and is no longer intact behind. The worm 

 was originally 11 mm. long. Its maximum width is 1'4 mm. 



The prostomium is only partially seen, for both nuchal organs are everted, form- 

 ing two lobulated masses which conceal a considerable portion of the prostomium 

 (fig. 3). The antero-lateral processes of the prostomium are stout and rounded at 

 their tips. The eyes, which are present on the dorsal surface of the prostomium, 

 diverge as they pass backwards ; they are not in contact at their anterior ends. 



The peristomium consists of a single achsetous ring which is broader ventrally, 

 where it is incomplete (fig. 4). 



The first and second chsetiferous segments are each bi-annulate, the third 

 and fourth show indications of subdivision into four rings, and the fifth and 

 following segments, as far as they are still present (i.e. up to the 28th ; there 

 were originally 34 chsetiferous segments), are clearly four-ringed. The rings are 

 subdivided, on the dorsal side at any rate, into quadrangular areas. 



The posterior end is now wanting, but Dr Gravier states that there were four 

 short, slender, anal cirri. 



The contours of the parapodia are not well preserved, but they were evidently 

 of similar form to those of the Scotia Bay specimen (cf. fig. 6). Finger-shaped 

 neuropodial cirri are present in the 21st # and following chsetiferous segments. 



There are no gills. 



The specimen is not sufficiently well preserved to have retained its lateral sense- 

 organs, and these have, therefore, not been looked for. 



Each of the first three notopodia bears, in front of the slender, tapering chsetse, a 

 number of stronger, shorter, bent chsetse, which taper much more abruptly at their 

 free ends, [n the second notopodium, which I excised for examination, there are 

 four kinds of chsetse practically identical in form with those described from the Scotia 

 Bay specimen (see pp. 411, 412). The chsetse from Dr Gravier's specimen are, 

 however, smaller, being about two-thirds the length and thickness of those of the 

 Scotia Bay specimen. There are several chsetse like that shown in text-fig. 1, A; 

 these are about '35 mm. in length and 6/u in greatest diameter. Nine stronger, bent 

 chsetse (text-fig. 4) are present ; these are about '45 mm. long and 9/x in maximum 

 diameter. The longer capillary chsetse (cf. text-fig. 1, C), of which there are about 

 thirty, are approximately '8 mm. in length and 6/x in greatest diameter ; among these 

 are several shorter capillary chsetse (cf text-fig. 1, D) about '5 mm. long. I have not 

 thought it necessary to figure all these types of chsetse, but a figure of one of the 



* Assuming, as is apparently the case, that there are no segments missing between the anterior and posterior 

 portions into which the specimen is now divided. 



