48 AUSTRALASIAN ANTARCTIC EXPEDITION. 



The largest individual is 81 mm. long ; the width of the body measured ventrally 

 in the region of segments 12-18, is 12 mm. ; it is 19 mm. over the neuropods ; and 

 28 mm. including the ventral chsetse. The number of segments is 46. The elytra are 

 uncoloured ; the dorsal body wall is without pigment, being flesh-coloured, except for a 

 band of pale violet on the tentacles and cirri below the subterminal swelling, and a 

 small violet or brownish patch on the anterior face of the dorsal cirrophores. 



In the smaller coloured specimens, the tips of the acicular processes are also 

 violet. 



The species has, as Gravier remarks, a quite characteristic appearance, owing to 

 the very long, straight dorsal chsetse of beautiful golden colour which radiate in all 

 directions from the upper surface of the large notopods, some of which overarch the 

 elytra. 



The anterior elytra, as well as those at the posterior end of the series, overlap 

 right and left, but in the middle region of the body, they leave the dorsum exposed, while 

 some dozen segments lie behind the last elytra. 



The account given by Gravier fits the present specimens so completely that it is 

 only necessary to note one point in which they appear to differ from those described by 

 him. 



Of the dorsal chsetse, Gravier states that the majority exhibit no ornamentation, 

 though some of the lower ones of a bundle are traversed by a few cross-markings, and 

 present indications of marginal denticulations (see his pi. IV, fig. 48). 



Ehlers, in his figure (pi. XXVII, fig. 4) shows a series of pectinated frills 

 crossing the chsetae from side to side. I agree with him, though his figure shows 

 them rather too widely separated from one another and is so drawn as to imply that 

 they have a spiral course. 



I find that in the younger individuals there is a fairly long smooth apex with a 

 blunt point (figs. 43, 44, 45), which in some of the older specimens, especially in the 

 chaetae in the uppermost part of the bundle, is frequently worn away, so that there is no 

 smooth region and the tip is almost truncated. Below this smooth region there follows 

 a series of about 30 closely set transverse pectinated frills which nearly encircle the 

 chseta ; each consists of minute teeth, and the frilled region occupies about half the 

 length of the exposed portion of the chseta, or even more in the shorter bristles of the 

 lower part of the bundle. 



While speaking of these dorsal chsetae, I may refer to a point on which I must 

 differ from Ehlers. In those smaller individuals which so closely resemble the specimens 

 described by him as H . crosetensis in all other respects, I find none of the long slender 

 hair-like bristles which he describes and figures as occurring in some of his specimens. 

 On p. 443, he describes the notopod as bearing in addition to and intermingling with the 

 stout yellow chsetse " sehr langen und haar-feinen Borsten," which project over the 



