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 Eulagisca seems 
to me to be unfortunate, as the head is so entirely different from that charac¬ 
teristic for the genus Lagisca. McIntosh 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 
Accetidse.” 
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 Elders (1913), p. 442, pi. XXVII, figs. 1-4 (nec Lagisca or os et cri¬ 
sis McIntosh).* 
(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 “ Harmothoe crosetensis Mcl.” 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 chaetae 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 chaetae—do not agree with the description 
and figures of Lagisca crosetensis given by McIntosh, whose figure of the entire worm 
shows, on the contrary, quite short chaetae, not overarching the dorsum in the slightest 
degree. 
Moreover, Ehlers states that the ventral chaetae are not bidentate which is a 
characteristically developed feature of L. crosetensis ; indeed the only feature in which 
the worm agrees with that of McIntosh 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 H ermadion 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 (1002, p. 2(56) belongs to McIntosh’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 inclines me to think that he had H. rouchi 
before him, as it differs from the figure given by McIntosh for his species and seems to have stout spines on the first frill; 
but the figure is rather indistinct in this respect. 
