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2. Gonodactylus graphurus, Aliers.
A series of specimens Avas obtained at the Seychelles (No. 194)
Avitb tbe preceding species.
Eoth G. chiragra and G. graphurus are referred to at p. 298 of
this Iteport.
3. Gonodactylus elegans. (P late L II. fig. B.)
T b e body is smooth, n o t lo n g itu d in a lly c o s ta te d ; carapace n e a rly
oblong, Avithout spines a t th e an te ro -la te ra l angles. P o s tr a l plato
smooth and somoAvbat tran sv e rse , Avitb its a n te rio r m a rg in reg u la rly
a rcu a ted , an d th e poste rior m a rg in s tra ig h t, its d is ta l e x trem ity n o t
acute. A n tep en u ltim a te an d p e n u ltim a te tho rac ic segments ro u n d ed
on tb e sides, an d tb e forme r b u t little la te ra lly p ro d u c e d ; th e la s t
th o ra c ic segm en t is overlapped on th e sides by th e produced an d
ro u n d ed a u te ro -la te ra l lobes of th e first p ostabdomina l segment.
T b e p o ste ro -la te ral angles of tb e fo u rtb to s ix th postab d omin al segm
en ts are acute ; tb e th ird to fifth segments bave each on th e dorsal
surfac e five small p its ; th e s ix th segment h a s its p o ste rio r m a rg in
a rm ed AA’itb fo u r small spines (in c lu d in g tb e produced and spiniform
p o ste ro -la te ral a n g le s ); tho te rm in a l segment is ab o u t as lo n g as
b ro ad , dorsally n e a rly smooth, Avitb an a cu te lo n g itu d in a l med ian
c arin a, Avbicb te rm in a te s poste rio rly , behind tb e d is ta l m a rg in , in a
sm a ll spinule ; th e po sterio r m a rg in is armed AA’ith six stro n g spines,
of Avbich tb e submedian p a ir a re tip p ed Avitb a small mobile spinule,
a n d bave betAveen th em about tAventy-six m in u te sp in u le s ; betAveen
th e submcdian au d th e n e x t la rg e spines a re tAvo sma lle r te e th , an d
betAveen th e second an d tb ird la rg e r spines one smaller to oth. The
eye-peduncles are ro b u st, an d ab o u t re a ch to tb e d ista l end of tb e
p e n u ltim a te jo in t of th e a n ten n u le s, one of whose th re e fiagella is
mucb sh o rte r th a n th e o th e rs. Tb e antennse a re ab o u t as long as
th e a n te n n u le s ; tb e a n te p e n u ltim a te p ed u n cu la r jo in t is armed w ith
a sh o rt s p in u le ; th e b a sa l scale is very mucb n a rrow ed a t base, an d
ro u n d ed an d c iliated a t its d is ta l e x trem ity . The ra p to ria l limbs
bave tb e m e ru s -jo in ts th ick en ed th ro u g h a b o u t two th ird s of tb e ir
le n g th , an d th en ce n a rrow in g d is ta lly ; carpus an d p e n u ltim a te
jo in t slen d er an d u n a rm e d ; dactylus slen d e r and b u t little ventricose
a t base, a rm ed on th e p ro x im a l h a lf of its in n e r m a rg in w itb two
te e th , and w itb th e d is ta l e x trem ity slende r an d acute. Tbe appendage
to tb e a n te p en u ltim a te jo in t of tb e th re e p o ste rio r th o ra c ic
limbs is_ styliform, slender, and ve ry n e a rly as long as th e p e n u ltim
a te jo in t. The postahdominal uropoda a re ab o u t as long as tb e
te rm in a l segment, th e ir basal processes te rm in a te in tAvo s tro n g an d
n e a rly eq u al spines,^ an d th e re is a small spine above tb e o u te r
ram u s, Avhicb la tte r is a little longer th a n tb e in n e r ram u s, b ia r ti-
culate, tb e b a sa l jo in t a rmed on its o u te r m a rg in Avith a series of
s tro n g s p in u le s ; th e in n e r ram u s is ovate, c iliated, an d u n a rm ed .
L en g th of tb e la rg e s t specimen ab o u t 11 lin e s (23 millim.).
A specimen was obtained at Providence Island or He des Poches,
13-20 fms. (No. 183), and also one at Providence Peef, 24 fms.
(No. 215). Botb are apparently females.
The form of the rostrum, together A v ith tbe armature of the te rmina/
segment, distinguish tbis species from all witb which I am
acquainted.
Kossmann {t. c. zweite Hälfte, p. 100) mentions a species of tbis
gcmm, Gonodactylus hrevisquamatus, Paulson, occurring in the Bed
Sea, witb which G. elegans may possibly be identical ; but as I bave
never seen Paulson’s work, I can say nothing of the true affinities
of G. hrevisquamatus.
There is in tbe collection a small male from Providence Island,
19 fms. (No. 217), wbicb is allied in many points to tho preceding ;
but the rostrum is transverse, witb its distal extremity defiexed, so
th a t in a dorsal view it appears transversely oblong, AAuth a straight
anterior margin, which does not project beyond the anterior margin
of the lateral divisions of the carapace. The penultimate postabdominal
segment is ai’med witb six teeth, including those of tho
postero-lateral angles. The terminal segment has a smaller longitudinal
carina on each side of tbe median longitudinal dorsal carina.
The terminal joint of tbe large raptorial limbs (second maxillipedes)
is even less distinctly ventricose at base, and its inner margin is
armed with about eight teeth. These characters may be peculiar to
tbe male sex; but if tbe specimen should prove, on further study,
to belong to a distinct species, I would propose to designate it G.
brevirostris (see Plate L II. fig. C).
Pseudosquilla empusa (De Haan)* is perhaps tbe species most
nearly allied to our new Gonodactylus ; it has tbe transverse tru n cated
rostrum of the male above described, witb the few-spined
dactyl of the female ; it is distinguished not merely by the non-
vcntricose dactyl of tbe raptorial limbs witb its longer spines, but
also (if tbe figure be correct) by tbe distinctly costated sixth postabdominal
segment, the shghtly divergent lateral dorsal carinæ of
tbe terminal segment, &c.
AMPHIPODA.
1. Mcera diversimanus. ( P late LII. fig. D.)
Tbe body is slender, witb the coxæ not so deep as their respective
segments; tho bead is about as long as deep, Avith a small triangular
median rostral lobe, and witb its antero-lateral angles rounded ; tho
coxæ of tbe first segment of the body have their antero-lateral angles
acute and produced below the lateral margins of tho head ; in the
succeeding pairs tbe antero-lateral angles aro rounded. Tbe first
* Fauna Japónica, Crust, p. 224, pi. li. fig. 6 (1849).
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