il
! ' 41
Í '
■ i j
9f ri)i!s ;Yr :
' 9te ji s
264 COLLECTIONS FROM MELANESIA.
6. Pagurus imbricatus, AI.-Edw.
A specimen which I believe to be an adult male is referred here
from Thursday Island, 3 -4 fms. (No. 145), an adult female from the
same locality and depth (No. 175), and a smaUer male from Prince of
Wales Channel, 9 fms. (No. 157).
Specimens also are in the British-Aluseum coUection from Shark
Bay, W. Australia (llayner, H.Al.S. ‘ Herald ’).
i'he smaUer examples agree very well with Alilne-Edwards’s brief
description *. ' As, however, the animal increases in size, small
grannies or prominences are developed upon the anterior margins of
the flattened tubercles or scales of the outer surface of the left
chelipede, which in the male from Thursday Island are large enough
to give it a uniformly granulated appearance.
7. Pagurus hessii. (P late XXVIII. fig. A.)
Carapace depressed, with a few hairs on the sides near the front,
the cervical suture distinctly defined; the branchial regions but
moderately dilated on the sides ; with no median rostral tooth, but
with the lateral frontal teeth (situated ju st outside of the bases of
the eye-peduncles) triangulate and suhacute; lateral margins w ith out
spines. Ophthalmic segment, between the eyes, completely
uncovered. Terminal postahdominal segment divided by a median
notch into two unequal rounded lobes. Eye-peduncles robust, in
the adult shorter than the width of the front, with the corneæ
considerably dilated ; their basal scales with a rounded lobe on their
outer margins, and with their apices suhtruncated and armed with
two or three spinules. Tho peduncles of the antennules in the adult
scarcely reach to the end of the eye-peduncles ; the antepenultimate
and penultimate joints of the peduncles of the antennæ each bear a
small spinule above, besides the longer aciculum which projects from
the dorsal surface of the penultimate joint, which has one or two
smaller spinules on its inner margin; the joints of the antennal
flagella are almost naked. The coxæ of the outer maxillipedes and
chelipedes are almost contiguous. The chelipedes are nearly equal
and of moderate size ; the merus-joints trigonous, the margins (in
the adult) armed with a few spinules toward the distal extremity ;
upper and. outer surface of the wrists scantily hairy and spinulose,
the spinules arranged in three longitudinal series; palms rather
turgid, about as long as the fingers, spinulose and hairy, the spinules
smaller and more crowded below, larger and more distinctly longitudinally
seriate on the upper and outer margins ; fingers spinulose
and hairy, with subexcavate dark corneous tips, and opening somewhat
obliquely. The last three joints of the first and second ambulatory
legs are hairy-and spinulose above; the terminal joints slender,
longer than the preceding, and externally longitudinally canaliculated
on the inner surface, bearing a series of oblique sulci which are
bordered with hairs. Both the fourth and fifth legs are chelate ;
* Anil. Sci. Nat. sér. 3, Zool. x. p. 61 (1848).
y
CRUSTACEA. 265
the dactyli well developed and impinging against the produced
scabrous infero-distal lobe of the preceding joint. The postahdomen
(in the female) has on its left side three appendages, articulated
with as many membranaceous dorsal plates, and each terminating
in four filaments or fiagella, which are clothed with long hairs. The
uropods on one side are imperfect, their rami are margined with
rather long hairs ; the segment with which they are articulated has
a longitudinal groove on its dorsal surface. The coloration (which
is probably faded in both the specimens examined) is yellowish or
whitish, with very faint pink reticulations in the larger specimen ;
the chelæ are pink, the eye-peduncles bordered on the sides with
broad longitudinal bands of brownish pink; the under and inner
surfaces of the last two joints of the second and third legs are of
the same colour. The length of the carapace (in the larger speci- ■
men) is about 1 inch 5 lines (37 millim.), the length of the third
(right) leg exceeds 3 | inches (90 millim.) ; but the specimen being
dried, its exact dimensions cannot be given.
Of this species a rather small adult female was taken in the
Arafura Sea, 32-36 fms. (No. 160). A much larger female, in mutilated
condition, wanting the postahdomen, is among the Banksian
specimens in the British-Aluseum collection, from which the description
is mainly taken. *
This species resembles Olibanarius, and differs from most species
of Pagurus in the subequal spinulose chelipedes ; in the structure
of the ophthalmic segment of the eyæs, the absence of a rostrum,
and in other points it is a true Pagurus. In P. platytliorax, Stm., a
species with equal chelipedes, the chelæ and legs are not spinulose.
The Pagurus minutus, Hess (vide Haswell, Cat. p. 156), from
Sydney, is too briefly^ described for certain identification, but seems
to be distinguished from P. rubrovittatus by the shorter antennal
appendages and tuberculated non-spinuhferous chelipedes.
8. Clibanarius tæniatiis.
Pagurus clihanarius, Quoy Gaimard in Voy. de V Uranie, Zoologie,
Crust, p. 529, pi. Ixxyiii. fig. 1 (1824).
Pagurus tæniatus, M.-Edwards, Ann. Sci. Nat. sér. 3, Zool. x. p. 62
(1848).
Clihanarius tæniatus, Stimpson, Proc. Acad. Nat. Sci. Philad. p. 235
(1858).
A single male was ohtained at Port Alolle, inhabiting a shell of a
species of Purpura. . Another specimen, presenting a precisely
similar system of coloration, is in the British-Aluseum collection
from Shark Bay (P. AI. Payner, H.Al.S. ‘ Herald ’).
These specimens agree with the figure of Ouoy and Gaimard, and
differ from the specimens referred to C. vulgaris in the collection of
the British Aluseum, in having the carapace (as well as the ambulatory
legs) marked with longitudinal pale lines bordered with red :
in the specimens referred to P. vulgaris this coloration does not exist
upon the carapace; the eye-peduncles are somewhat longer and
, 1 S : I.
: r
A
.4 '7
I
I ' ' , ;
4'
!I
j i r