160 
THE VOYAGE OF H.M.S. CHALLENGER, 
Pilumnus tomentosus (?), Latreille (Pl. XIY. fig. 4). 
1 Pilumnus tomentosus, Latreille, Encycl. Meth., vol. x. p. 125, 1825. 
,, „ Milne Edwards, Hist. Nat. Crust., vol. i. p. 418, 1834. 
Specimens from Bass Strait, are referred, but very doubtfully, to this species. 
They were collected off East Moncceur Island in 38 fathoms (Station 162). Also a female 
from the entrance to Port Philip, Australia, 38 fathoms (Station 161). 
Pilumnus tomentosus is but very briefly characterised, and has, I believe, never been 
figured, therefore its identification must remain uncertain. The species I thus designate 
is, it would appear, one of the commonest on the South and South-Eastern Australian 
coasts. The colour is variable ; the specimens from East Moncoeur Island are light 
reddish-brown with yellowish pubescence, that from Port Philip is darker brown, and 
others in the collection of the British Museum blackish-brown, as in the description 
of Milne Edwards ; the pubescence is always short and rather dense. The frontal 
lobes are rather prominent and rounded, the orbital margins are not distinctly 
denticulated above ; there exists, besides the spinules mentioned by Milne Edwards, a 
small spinule on the subhepatic region, which is visible between the exterior orbital and 
first antero-lateral spine. The surface of the carapace is sometimes smooth, but usually 
bears several spinuliform granules near the antero-lateral marginal teeth, these granules 
and the spinules of the upper surface of the wrist and palm in the Challenger specimens 
from Bass Strait (Station 162) are red coloured. 
Adult $ . Lines. Millims. 
Length of carapace, about . . . . . . 8 17 
Breadth of carapace, about . . . . . . 10^ 22 
Pilumnus rufopunctatus, Stimpson (PI. XIY. fig. 5). 
Pilumnus rufopunctatus, Stimpson, Proc. Acad. Nat. Sci. Philad., p. 36, 1858. 
South Australian coast, 2 to 10 fathoms, April 1874. (A small ova-bearing female). 
This species is apparently distinguishable from the one I have referred to as Pilumnus 
tomentosus, by the broader carapace, less prominent front, the existence of several 
denticules on the upper margin of the orbit, and by the closely approximated granules on 
either side of the median line of the carapace, on the front of the gastric region. 
The pubescence of the carapace is short, close, and rather dense, especially near the 
front and antero-lateral margins; the dorsal granules are less numerous than in Stimpson’s 
description. The granulations of the larger chelipede, which extend over the outer surface, 
are absent from the inferior margin. If, as is possible, this species be the true Pilumnus 
tomentosus, Latreille, the Challenger specimens designated Pilumnus tomentosus must 
receive a new specific designation. 
