■T
tudiual, and cervical sutures well defined ; there is no median rostral
lobe, and the lateral lobes of tbe frontal margin (situate between
the eyes and antennæ) are obtuse and little prominent. These
lateral margins are armed with a few very small spinules at and
behind tbe antero-lateral angles ; tbe branchial regions are moderately
dilated. The sternum between tbe bases of tbe fourth pair
of logs is of considerable width, and tbe coxæ of tbis and of the
third pair widely remote from one another, but those of the first
and second pair are contiguous. The postabdomen (in the female)
bears three triramose ciliated appendages, and in tbe middle of its
inferior surface a strong conical and somewhat hairy fleshy protuberance
; above it is protected by membranaceous qilutes ; its
terminal segment is very small. The eye-peduncles are thickened
somewhat distally, and are somewhat longer than tbe anterior
margin of tbe carapace ; tbeir corneæ are small and occupy about a
fifth of tbe total length ; tbeir basal scales are as broad as long and
denticulated on tbe distal margins at and near the antero-internal
angles. The peduncles of tbe antennæ are ratber shorter than tbe
eye-peduncles; the antepenultimate joint is armed above witb a
strong setose spine, at base of wbicb is a smaller spine ; the two last
peduncular joints are slender; the joints of tbe flagella nearly naked.
Tbe larger (left) chelipede has a trigonous merus-joint, whose upper
margin is not toothed, but whose lower margin has about half a
dozen irregular spines aud teeth ; tbe carpus is spinulose ou all its
upper and outer surface ; tbe palm (nearly twice as long as tbe
wrist) has its upper and half of its outer surface spinulose,
but the lower half of its outer surface smooth, except at the
inferior and proximal angle; tbe lower margin, botb of palm
and immobile finger, is tbin-edged, straight, and spinulose ; tbe
inner surface of the palm has a few granules on its upper part ;
tbe mobile finger is spinulose above, near tbe base, and botb fingers
have tbeir apices subacnte, witb only very small corneous tips. In
the slender smaller chelipede botb wrist and palm are spinulose and
hairy on tbeir upper and outer surface, tbe fingers are snb-excavate
at apex, witb corneous tips, the upper spinulose at base; the second
and tbird legs are slender and rather hairy, witb tbe dactyli slender,
arcuated, and mucb longer than tbe preceding joints ; on tbe left
side tbe second legs have tbe penultimate and last joints .spinulose
above, but nearly smooth on the outer surface ; tbe terminal joint
externally longitudinally canaliculated ; tbe third (left leg) has its
penultimate joint spinulose all over the outer surface ; its terminal
joint is broken, but was apparently externally longitudinally canali-
cnlated and strongly spinulose above ; in the fourtb legs the penultimate
joint terminates as usual in a scabrous pad, and tbe dactyl
is arcuate and denticulated on its inner margin ; tbe fifth legs are
apparently more distinctly chelated, and are densely hairy at tbe
distal extremity. Tbe chelipedes and ambulatory legs are ratber
scantily clothed witb hair. Coloration (in spirit) yellowish witb
reddish patches (iuterpunctulated witb white) on tbe postfrontal
regions of the carapace, chelipedes, second and third legs. Length
of carapace, in tbe middle line, about 6g lines (14 millim.) ; length of
larger (left) chelipede nearly I I lines (23 millim.); of second (left)
ambulatory leg 1 inch 1 / line (28 millim.).
Seychelies, 4 -1 2 fms. (No. 194); an adult female.
P. guttatus, Olivier, as described and figured, differs somewhat in
tbe spinulation of tbe chelipedes and two following legs aud in the
coloration.
In the form and spinulation of the larger chelipede it somewhat
resembles P. varipes, Heller * ; but th at species is distinguisbed by
many important characters, as (e.g.) by the shorter eye-pednncles,
the existence of a strong tooth on the upper margin of the merus-
joint of tbe larger chelipede, and in tbe form and sculpture of tbe
left leg of the tbird pair (cf. Dr. Heller’s figure, t. c. pi. ii. fig. 3).
Tbe type of P. guttatus was from the Alauritius ; Lenz and
Hicbters record tbis species from Aladagascar.
Dana refers specimens from Hpolu (wbicb may, however, be
specifically distinct) to this species.
8. Calcinus tibicen (Herhst).
Mozambique, between tide-marks (No. 225); a female.
A specimen from tbe same locality was presented to tbe British
Museum by tbe late Dr. Livingstone. Specimens are in the Museum
collection from Bodriguez (H. H. Slater) ; Aladagascar, Tamatave
(Bev. D. Coiuan) ; Keeling or Cocos Islands (Lieut. Burnahy) ; Pelew
Islands (Br. G. L. King) ; and Sandwich Islands (W . H. Pease) ;
besides a series of specimens from tbe ‘ Herald ’ collection without
locality.
9. Petrolisthes lamarckii (LeacK).
Darros Island, beach (No. 200); an adult male and female.
These specimens present the distinctive characters of tbe species
referred to in tbe preceding part of tbis Beport (p. 268). Tbe body
(in spirit) is of a reddish colour, punctulated witb yellow; tbe
carpus and penultimate joints of the first and second ambulatory
legs alternately banded witb yellow and red. In some specimens
from Ceylon (Dr. W. Ondaatje) tbe yellowish colour predominates,
as in tbe following variety.
10. Petrolisthes lamarckii, var. asiaticus, Leach.
Of tbis variety, if it ean be so styled, three specimens were collected
witb the typical P. lamarclcii at Darros Island. In these
specimens, and in almost all I bave examined, except Leach’s tjqie,
from the Alauritius, a longitudinal purplish line exists on tbe upper
surface of tbe palms of tbe chelipedes, and tbe outer (or posterior)
margin of the palm and mobile finger is marked with a series of
* Sitz. Akad. Wissensch. Berlin, xliv. (1) p. 244, pi. i. fie. 1, and pi. ii flea
2, 3 (1862). ^ ^ ■
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