38 AUSTRALASIAN ANTARCTIC EXPEDITION. 



upper lip of the mouth, and especially along its median line, on the ridge which extends 

 upwards to the anterior margin of the prostomium ; and ( 2) the elongated lips of th i 

 notopodial and neuropodial lobes are coloured dark brown or purplish brown. 



These two features I found very useful in distinguishing readily the species from 

 H. tuberosa. 



As to the chsetse. The latest drawings are those of Fauvel (1916, pi. VIII, figs. 

 8, 9). He shows the dorsal chseta as having a row of stout spines along one edge, 

 each spine being apparently the enlarged marginal tooth of one of the pectinated frills. 

 My own observations do not bear out this interpretation ; the frills certainly project 

 a good deal beyond the edge, and the appearance produced is of rather stqut spines, 

 but I interpret this as being due merely to the fact that two or more of the pectinations 

 are here seen one over the other, producing indistinct thickening of the frill. I do not 

 find definite spines here, nor do other authors. 



In the ventral chaetse, however, there are in the distal frills definite spines which 

 are shown by Willey (pi. XLIII, fig. 2). 



In this paper (1902) Willey distinguishes "three principal allotypic modifi- 

 cations " of the species, one of which he retains as a distinct species, and refers it to 

 Mclntosh's Lagisca crossetensis . The othertwo are described as varieties of H. spinosa, 

 namely, " var. typica " and " var. futto," with a sub-variety " lagiscoide." The two 

 latter varieties are characterised by, among other things, the presence of long conical 

 tubercles or spines on the elytra; the last variety by the fact that the hindmost seg- 

 ments are not cervered by the elytra. 



Gravier (1911) describes in detail examples of the two varieties, " typica " and 

 " lagiscoides ," and mentions that the latter has the elytra more deeply pigmented than 

 the former. 



I have, as already noted, a very large series of the species but I have failed to 

 find any in which the hinder segments are thus exposed. It is true that I have not 

 been able to give the time to sorting out of this series into groups or varieties, and the 

 range of variation in several characters is very considerable, as Ehlers has shown, yet 

 both in large and small specimens, in those with dull and in those with bright colouration 

 the elytra cover the whole body. It must, however, be noted that in many cases the 

 elytra had fallen away ; but I find, as Gravier did, that none of those examined with 

 this purpose possess as many as forty segments, the number given by Willey for this 

 particular individual. Is it possible that he had under observation some other 

 species ? 



Localities. 



Boat Harbour 



2-4 fathoms, coll. by Dr. A. L. McLean (fourteen). 

 3 fathoms, coll. by Dr. A. L. McLean (twenty-one). 

 4^ fathoms, coll. by Dr. A. L. McLean (three). 



