Goree Island, Senegambra. 275 
on the under and inner sides of the joints ; the eye-peduncles 
are bluish, banded with red. Length of cephalothorax in 
the largest example (a male) about 74 lines (16 millim.), of 
the larger (left) chelipede, when extended as far as its confor- 
mation will allow, rather more than 1 inch (26 millim.). 
There are in the British Museum specimens of this species 
from Madeira (purchased) in which the coloration has to a 
considerable extent disappeared; also others apparently 
referable to the Mediterranean P. calidus, Roux. Of this 
latter species there are also specimens from Lanzarote Island 
(Rev. L. T. Lowe)*. 
* There is in the collection of the Museum a remarkable Hermit-crab 
from St. Helena, which does not appear to have been described; it may 
be appropriately designated 
Pagurus imperator, sp, 0. 
The carapace is indurated in its cervical portion, and considerably 
dilated on the sides of the branchial regions, with the cervical, post- 
frontal, and other sutures strongly defined ; the lateral margins are hairy ; 
the frontal margin is nearly straight, without any median rostriform pro- 
minence, but with an obtuse lobe or tooth on either side of the eye- 
peduncles. Four transverse calcareous plates protect the dorsal surface 
of the postabdomen; the penultimate and terminal segments are calcified, 
the penultimate segment with a T-shaped impression, the terminal seg- 
ment furcate, with the lobes unequally developed and rounded at their 
distal ends, and with three or four denticles on their inner margins. 
EKye-peduncles robust and shorter than the front, with two or three tufts 
of hairs on their upper surface near the cornez, and with their basal 
scales narrowing distally, and hairy and denticulated on their outer 
margins. Antennules short. Antenne shorter than the body, with the 
terminal joint of the peduncle much longer than the preceding; the 
‘basal acicle short, spinitorm, and not reaching far beyond the end of the 
penultimate peduncular joint ; flagellum red, the joints clothed with very 
short setee. Outer maxillipedes robust, short. Chelipedes robust, un- 
equal; in both the merus is trigonous, with its inferior margin and the 
outer and distal margins armed with short spines; wrist and palm exter- 
nally convex, wrist shorter than the palm; both wrist, palm, and fingers 
are armed on the outer surface with numerous conical acute spiniform 
tubercles, the surface between the tubercles in the larger (left) hand 
being closely pubescent, and in the smaller (right) chelipede clothed only 
with longer scattered hairs; the fingers are robust, dentated on their 
inner margins, and with black, corneous, excavated tips. The second 
and third legs are very robust, the last three joints armed above with 
strong spiniform tubercles and clothed with scattered hairs ; tarsi exter- 
nally longitudinally sulcated, except in the second leg on the left side, 
which has the last two joints dilated and nearly of the same form as in 
P. pavimentatus, Hilgendorf, 7. e. with a strong longitudinal tuberculated 
ridge on their outer surface, above which the outer surface of each joint 
is deeply longitudinally concave; margins densely hairy, the concavity 
deepest in the terminal joint; the fourth pair of legs are imperfectly and 
the fifth perfectly chelate; the four postabdominal appendages (deve-~ 
lgped on the left side only, and articulated with the calcareous dorsal 
plates) are simple; the uropoda are asymmetrical, the left ene larger 
19 
