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marg in of th e ro strum , Avhereas in P. canaliculatus th e re is commonly
b u t one ; and i t is n o t s ta ted in tb e a u th o r’s d e scription Avhether th e
te rm in a l segment of P. brevirostris b ea rs la te ra l m a rg in a l spinules.
As th e ty p e Avas from lle a le jo , on th e Avcst coast of N ic a rag u a , tb e
ran g e of P. canaliculatus ( if it bo id en tic a l w itb th a t species) seems
to ex ten d e a stw a rd to th e American coast.
I may add here, th at P. occidentalis, Streets*, from the Isthmus
of Piinama, to which reference is not made in my paper above r e ferred
to, seems to be identical with P. stylirostris, Stimpson, wbicb
I supposed (in 1878) to be synonymous Avitb P. indiens ; but according
to Air. Spence Pate, Avbo has since examined the types in the
Paris collection, not only P. indicus but also P. semisulcatus, De Haan,
P. carinatus, Dana, P. tahitensis, Heller, and P. esculentus, Haswell,
are varieties of P. monodon, Fabricius {vide Ann. & Alag. Nat. Hist,
ser. 5, vol. viii. p. 177, pi. xii. iig. 5, and p. 178,1881). Tbe designation
P. stylirostris has precedence by a few weeks only over P.
occidentalis.
8. Penæus richtersii. ( P eate L II. fig. A.)
Carapace with the cerAfical region scantily clothed witb a short
pubescence. Hostrum very short, reaching about halfway to the
end of the eye-peduncles, ascending slightly, and laterally compressed
; armed above witb six teeth, of Avhich tbe two posterior are
situated on the dorsal surface of tbe carapace, and behind these,
but at no great distance, on tbe gastric region is another tooth ; the
lower margin, under a low magnifying-power, appears entire, but is
very minutely denticulated; the distal end is subacule, but not prolonged
into a spine. On tbe carapace is an antennal and hepatic
spine, and also a small supraocular spine or tooth ; its dorsal surface,
behind the gastric spine, is not distinctly carinated. The postabdomen
is smooth and nearly glabrous ; its fifth aud sixth segments
are slightly dorsally carinated, but the carina does not
terminate in a spine; there is a very small spiniform tooth at the
postero-lateral angles of tbe sixth segment ; the terminal segment
is narrow and acuminate at its distal extremity, dorsally canaliculated
in its proximal half, witb three pairs of lateral mobile spines,
of which tbe posterior pair aro mucb longer and jointed in tho
middle. The eye-peduncles are shaped nearly as in P. velutinus,
and scarcely reach to tbe distal end of tbe antepenultimate joint of
the antennulary peduncles, tbo longer of whose flagella is shorter
than tbe carapace. Tbe peduncle of tbe antennæ is concealed, in a
dorsal view, by tbo mucb longer antennal scale, which reaches
nearly to the distal end of the peduncle of tbe antennules ; the antennal
flagellum is slender and nearly naked (broken in the specimen
described) ; tbe outer maxillipedes are short, scarcely reaching
to the end oD the eyes. The legs present nothing remarkable ;
there is a small spine on tbe second and, I think, tbe third joint
of th e legs of tb e first p a ir, b u t none on tb e second an d tb ird
p a irs of le g s ; th e fifth l e p a re scarcely lo n g e r th a n tho fo u r tb ;
an d the d a c tyli, in b o tb p airs, ab o u t eq u a l tb e p e n u ltim a te jo in t iu
le n g th . The ram i of th e uropoda a re r a th e r narroAV ovate, an d longer
th a n th e te rm iu a l segment, s lig h tly p ube sc ent above and Avitb long
ciliated m a rg in s. L en g th of tb o la rg e r specimen (a ma le ) ab o u t
1 in ch lines (31 millim.).
Cerf Island, 10 fms. (No. 232); two males.
The description is taken from the largest sjiecimen.
I b i s species is d istin g u isb ed from most of its congeners
form and ex trem e b re v ity of tb e ro s trum , tb e a rm a tu re
te rm in a l segment, &e.
From P. ? podopliiJudmus, Stimpson, from Hong Konf
by tbe
of the
it is at
length of tb e eye-once distinguisbed by the peduncles an d a n -
terinules.
I t is apparently allied to P. palmensis, Haswell, from Palm Island,
which has, hoAvever, a longer rostrum with more numerous teeth,
the second to sixth segments of the postabdomen carinated, &c.
There are in tbe collection three small specimens of a species of
this genus, also obtained at Cerf Island with P. richtersii, wbicb I
refrain at present from designating by a distinct specific name,
although I cannot refer them to any described species. Tbe body
is everyAvhere covered witb a short hispid pubescence. Tbe rostrum
is short and slender and acute, scarcely reaches beyond the eyes, and
is armed above witb five teeth, whereof tbe first is separated by a
wider interval and is placed on the gastric region, tbe second tooth
on the postfrontal region, just behind the anterior margin of tbe
carapace; the second to sixth segments of tbe body are carinated
(as in P. palmensis); on the sixth segment tbe carina terminates in
a small spinule. From P. richtersii they seem to be distinguisbed
by the mucb slenderer, more acute, and longer rostrum,'and the
longer carina of the postabdomen ; and from P.palmensis, Haswell,
with which, however, they may prove to be identical, by tbe fewer
rostral teeth, &c.
STOMATOPODA.
1. Gonodactylus cbiragra, Fabricius.
An adult female is in the collection, from Alozamhique, beach
(No. 224), and small specimens from the Seychelles, 4 -12 fms.
(No. 194); Darros Island, 22 fms. (No. 185); and Etoile Island,
13 fms. (No. 191).
* This species cannot be included in Penæus as receiitlj defined by Mr.
Spence Bate (Ann. & Mag. N. II. t. c. p. 173, 1881).
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