46 AUSTRALASIAN ANTARCTIC EXPEDITION. 



Remarks. The " Challenger " obtained only two specimens, one compete and one 

 incomplete and it has not been recorded since. The name Eulogisca seems 

 to me to be unfortunate, as the head is so entirely different from that charac- 

 teristic for the genus Lagisca. Mclntosh writes : ' The bristles are allied 

 to those of Lagisca, while the eyes, scales, ventral papillae diverge. The 

 subtentacular cirrus is unique and is akin to the proboscidian process of 

 Acoetidse." 



Genus HERMADION Kinberg. 

 HERMADION ROUCHI Gravier. 



Gravier (1911), p. 82, pi. Ill, figs. 33, 34; pi. IV, figs. 45-51; pi. VII, 

 fig. 74. 



Harmothoe crosetensis Ehlers (1913), p. 442, pi. XXVII, figs. 1-4 (nee Lagisca croseten- 

 sis Mclntosh).* 



(Plate 7, figs. 43-47.) 



Of the ten specimens which I attribute to the species, two, measuring 18 mm. 

 with 27 segments, and 22 mm. with 38, are closely similar to Ehlers coloured figure 

 (fig. 1) of the worm to which he applies the name " Harmoth'je crosetensis Mel." That 

 is, the elytra are alternately darker and very pale in the case of his specimens, gray 

 in colour, in mine, olive-green or olive-brown in the two individuals respectively. The 

 dorsal chaetse are golden, long, and overarch the dorsum and even inter- digitate with 

 those of the other side. In these and practically all other details of structure my 

 specimens agree with the account given by Ehlers. But these features especially 

 the great length and the position of the dorsal chsetae do not agree with the description 

 and figures of Lagisca crosetensis given by Mclntosh, whose figure of the entire worm 

 shows, on the contrary, quite short chsetee, not overarching the dorsum in the slightest 

 degree. 



Moreover, Ehlers states that the ventral chsetse are not bidentate which is a 

 characteristically developed feature of L. crosetensis ; indeed the only feature in which 

 the worm agrees with that of Mclntosh is that the elytra bear sharply-conical tubercles. 



At first I was content to accept the identification by the most experienced 

 European student of exotic Annelids, till I came to examine another lot of worms of 

 larger size than the two above mentioned ; these are without pigment and agree in all 

 essential features with Gravier's account of Hermadion rouchi. 



I then returned to these smaller specimens of what I had thought were Harmothoe 

 crosetensis, and after a careful comparison of organ with organ of the two lots, I found 

 that they presented such a close agreement as to amount to identity, so that I came to 

 the conclusion that the smaller coloured individuals are the young of Hermadion rouchi. 



* Whether the species briefly described by Willey (1902, p. 266) belongs to Mrlntosh's species or to Gravier's I am 

 unable to decide, but the sketch (pi. xliii, fig. 3) of the tip of the ventral chseta incline's me t<i think that he had //. nuirlii 

 before him, as it differs from the figure given by Mclntosh for his species and seems (o have- stout spines on the first frill ; 

 but the figure is rather indistinct in this respect. 



