AUSTRALASIAN ANTARCTIC EXPEDITION. 
102 
P. crocea , it has only been recorded since that date in the “ Challenger ” 
report. Grube’s material appears to have been but a single specimen, which 
was obtained between Heard Island and the Crozets. That collected by the 
“ Challenger ” came from Kerguelen. 
I regard the present as a different species since Grube describes two 
pairs of gills in some detail, and he makes no mention of the four membranes 
springing from the axis; he describes the gill as foliaceous “ quasi lanceolata.” 
McIntosh gives a brief account of a mutilated anterior end of a worm which 
he ascribes to Grube’s species. His figure (pi. XLVII, fig. 11), agrees in 
general form quite closely with the worm herein described, but is without 
any gills. In the text he writes (p. 427), “ the next segment bears dorsally 
the marks of four branchial processes on each side.” 
His figure shows three pans of pit-like structures, which are no doubt 
the “ channels ” that I describe above, and which I suppose Grube refers to 
as “ areola?.” McIntosh seems, however, to interpret them as the bases of 
gills. They have the same relation to one another and the same position on 
the segments as I have described. It may be very likely that he had before 
him the present species. 
As both these accounts are brief, and as only one figure of this 
interesting genus has been published, it has seemed to me worth while to give 
rather a detailed description of the worm. 
Genus Amythas, gen. non .* 
AMYTHAS MEMBRANIFERA, Sp . 710V. 
(Plate 10, figs. 124-132.) 
A single individual of this remarkable worm was obtained from a depth of 325 
fathoms in Commonwealth Bay. 
It is unperfeet posteriorly, lacking, however, only a few segments, and consists 
of a head and thirty segments, measuring 60 mm. in length, with an anterior diameter of 
12 mm., which diameter decreases posteriorly till at the end of the fragment it is only 
5 mm. The anterior region is a good deal contracted, and the animal was ruptured 
about half-way along its length, and broke into two pieces on being handled. 
As in other genera, the body is divisible mto two regions, thoracic and abdominal: 
the former is indicated by the seventeen pairs of notopods with capilliform clmetse, which 
are absent in the abdomen. The thoracic region appears to be strongly contracted, so 
that probably the dimensions of the worm just given are not quite correct. The whole 
The name is fornled by transferring the initial “ S ” of S amytlia to the end. 
