302 COLLECTIONS FROM MELANESIA.
The inner ramus of the uropoda is less distinctly triangulate than
in the specimens in the British-Museum collection from the Philippines
and Swan Eiver*. The median lobe of the front is not a t all
prominent.
Eeference to this species is omitted in Air. Has well’s Catalogue.
4. Cirolana schiödtei. (P late X X X III. fig. A.)
Body narrow-oblong, microscopically punctulated, convex and
smooth, as in C. rossii. Head closely encased in the first segment of
the body, transverse, with scarcely any indication of a median inter-
antennulary rostral point, anteriorly bordered with a transverse groove
running parallel to and ju st behind the anterior margin ; there is a
similar groove bordering the posterior margin of the eyes. The
first segment of the body is longer than the following ; the posterolateral
angles of the first four segments are rounded, those of the
fifth to seventh segments are right angles. Five or six postabdominal
segments are visible in a dorsal view ; the first five are very
short, the lateral angles of the second to fourth curve backward and
are much prolonged and acute or suhacute ; the terminal segment
is widest at base, and beyond this subtriangulate, with the lateral
margins converging in a gentle curve to the distal extremity, which is
acute or suhacute ; the margins in their distal half are ciliated and
minutely serrated. The eyes, seen laterally, are oblong (as in C.
rossii) ; they each occupy rather less than one third of the total
length of the front margin of the head, and extend but a short distance
over its inferior surface. The antennules reach nearly to, or
even a little beyond, the posterior margin of the head ; the joints of
the peduncle are short, the first two slightly more dilated than the
third, the fiagellnm composed of a great number of very short joints.
The interantennal plate (“ lamina frontalis ”) lies between the bases
of the antennæ, its sides diverge slightly from the base to a point
situate between the antennules and antennæ, where it hears a strong
tooth ; beyond this its distal extremity is acute, and lies between but
does not completely separate the antennules. The antennæ about
reach to the posterior margins of the fifth body-segment. The
first two joints of the peduncles are very short, the third and fourth
somewhat longer and robust, the fifth yet longer, bnt slenderer than
the preceding ; the flagellum is composed of a great number of joints
(50-65). The three posterior epimera have their postero-lateral
angles prolonged and acute. None of the legs of the body are
ancoral. The ischium- and merus-joints in the first three pairs are
dilated and dorsally produced. The margins of the third to fifth
joints in all the legs are clothed with stiff setæ ; the dactyli in all
are but slightly curved. The bases of the uropoda are prolonged
at their inner and distal angles into a strong spine ; the rami are
ciliated on the margins aud acute at their apices, the outer much
narrower and a little shorter than the inner, which reach a little
* Fide Journ. Linn. Soc. xiii. p. 511, pi. xxiv. figs. 6-11 (1878),
beyond the distal extremity of the terminal segment. Colour (in
spirit) vellowish white. The length of Dr. Coppinger’s largest specimen
is little over 8^ lines (18 millim.) ; but the largest example
in the British-Museum collection is of much greater size, measuring
not less than 1 inch 2 | lines (31 millim.). oo qu r
Two specimens were dredged in the Arafura Sea, 32—oo ims.
(Xo. 160). . , .
There are in the British-Aluseum collection several specimens
collected in Torres Straits {J. B. Juices). All of these appear to be
of the male sex. The terminal segment (only) is slightly pubescent
above. . . ,
The mandible closely resembles th a t of G. hirtipes as figured by
Alilne-Edwards*, in its truncated and strongly dentated apex, sensorial
appendage, and triarticulate palpus ; the rnaxillipede is also
formed on a precisely similar type to th at of C. hirtipes.
The form of the interantennal plate, which somewhat resembles
th at of certain Ægæ (e. g. Æga spongiophila), and of the latei'«! Prolongations
of the second to fourth segments of the postahdomen at
once distinguish this species from Cirolana hirtipes, M.-Edw., and
C. rossii, Aliers, and from Cirolana {Eurydice) swainsonii, Leach, a
Alediterranean and AVest-African form, to which C. schiödtei is very
nearly allied. Æga novizeakmdioe, Dana, and Cirolana latistylis
and orientalis, all of them forms somewhat insufficiently described,
appear to be distinguished by the much more rounded and less
triangulate terminal segment, &c. 0. arabica, Kossmann, to judge
from his f lg u r e s t , is distinguished by the form of the rostrum,
terminal segment, and interantennal plate both from this and the
following species.
5. Cirolana tenuistylis. (P late X X X III. fig. B.)
’ As this species in many particulars nearly resembles the foregoing,
it may suflice here to point out its chief distinctive characters._ The
interantennal process is narrow-linear, as in C. rossii or C. hirtipes,
but the eyes are subquadrate or somewhat rounded, with very large
ocelli and each occupy less than one fourth of the total length of the
front and lateral margins of the head, which has a more prominent
median frontal process. The antennules have the first two joints of
the peduncle more dilated, the second very short, the third robust,
but less dilated than the preceding ; the last two joints of the jieduncle
of the antennæ are shorter than in C. schiodtei. The third and
fourth joints of the ambulatory legs are considerably dilated and
margined with stiff setæ. The inner ramus of the uropoda is much
narrower than in G. schiödtei, with the sides parallel to near the
extremity, which is suhacute. The length of the largest specimen
is about 7 lines (15 millim.). ^ . p •
A single specimen, I think a male, is in the collection from Prince
* Atlas in Eègne Animal de Cuvier, Crust, pi. Eyjj. %•
t Zool. Ergebn. Eeis. roth. Meer. ii. p. 114, pi. vm. figs. 7, 11 (1880).
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