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112
24. Glyptonotus megalurus, G. O. Sars, n. sp.
(Pl. X, Fig. 1—23).
Idotea Sabini. var. (4. O. Sal’s, Prodromus descriptionis Crust, etc.,
No. 60.
Chiridotea mrgalwra, G. O. Sars, Crustacea et Pycnogönida nova etc.,
No. 7.
Artscharacteristik. Legemet af aflang Fonn, ikke
fuldt 4 Gange saa langt som bredt. Forkroppen næsten
overalt af ens Brede. Bagkroppen af samme Længde som
Forkroppen; Endesegmentet særdeles stort og bredt, med
Sidekanterne jevnt convexe og Enden konisk tilspidset,
næsten horizontal. Intet Spor af Øine. 2det Par Folere
med Skaftets 2det Led dannende udad en bred borstebesat
Lap. Svøben af samme Længde som Skaftets 3 sidste Led
tilsammen og bestaaende af 6—8 Led. Farven ensformigt
graalig. Længden indtil 50""".
•
Findesteder. Ståt. 35, 40, 183, 295. 353.
Bemærkninger. Den lier omhandlede kjæmpemæssige
Isopode viser en saa stor habituel Lighed med den af Kröyer
beskrevne Idotea Sabini, at jeg i Begyndelsen kun holdt
den for en Varietet af samme. Efter imidlertid senere at
have undersøgt authentiske Exemplarer af sidstnævnte Art,
finder jeg dog, at begge disse Fornier, omend særdeles
nær-staaende, dog maa adskilles som distincte Arter. Fra CIi.
Sabini kjendes vor Form let ved den langt betydeligere
Størrelse og afvigende Fonn af Bagkroppens Endesegment
samt ved den ensformige graalige Farve.
Beskrivelse. Legemet er (se PI. X, Fig. 1 og 2) af
aflang Fonn, næsten 4 Gange saa langt som bredt, noget
nedtrykt, dog med temmelig stærkt hvælvet Bygflade.
Forkroppen er næsten overalt af ens Brede, medens Bagkroppen
ved Basis viser en stærk Indknibning.
Integumenterne er paa Bygsiden meget haarde og
stærkt incrusterede samt viser under Mikroskopet en fint
granuleret Skulptur.
Hovedet er omtrent 3 Gange bredere end langt, oventil
temmelig stærkt hvælvet, med en utydelig Indtrykning langs
Midten. Det gaar til hver Side ud i en triangulær
plade-dannet Fortsats, der i Kanterne er besat med korte Borster
og fortil ved et lidet Indsnit skilt fra Panderanden. Denne
er i Midten ganske svagt indbugtet, forøvrigt ganske glat.
1ste Forkropssegment har den forreste Band dybt
concav for at kunne optage Hovedet. Dets Sidedele eller
Epimerer, der ikke ved nogen Sutur er skilte fra Segmentet,
er noget fortilboiede, pladeformige og ender med et
tydeligt, næsten retvinklet Hjørne. Den bagre Band er paa
24. Glyptonotus megalurus. G. O. Sars, n. sp.
(Pl. X, figs. 1—23).
Idotea Sabini. var., G. O. Sars. Prodromus descriptionis Crust., etc.
No. 00.
Chiridotea megalura, G. O. Sars, Crustarea et Pycnogonida nova, etc..
No. 7.
Specific Character. — Body oblong in form, not quite
4 times as long as broad. Anterior division almost
everywhere uniform in breadth. Posterior division equal in
length to anterior; terminal segment exceedingly large and
broad, with the lateral margins uniformly convex and the
extremity conicallv pointed, almost horizontal. No trace of
eyes. Second pair of antennæ with 2nd joint of peduncle
forming exteriorly a broad setiferous lobe, flagellum equal
in length to the 3 last joints of peduncle •taken together,
and consisting of from 6 to 8 articulations. Colour a
uniform grey. Length reaching 50""".
Locality. — Stats. 35, 40, 183, 295, 353.
Remarks. — The gigantic Isopod treated of here
exhibits so great a resemblance in its outer habitus to
Kröyer’s Idotea Sabini. that at first I felt disposed to regard
it as a mere variety of that form. Meanwhile, having since
examined authentic specimens of the latter species, I am now
clearly of opinion that the two aforesaid forms, though very
closely approximating! must nevertheless be assigned specific
distinctness. From Cli. Sabini. the form in question is easily
recognized by its far greater size and the deviating shape
characterizing the terminal segment, as also by its uniform
greyish colour.
Description. — The body (see Pl. X, figs. 1, 2)
oblong in form, almost 4 times as long as broad,
somewhat depressed, though with the dorsal surface rather
prominently arched. The anterior division of the body almost
everywhere uniform in breadth, whereas the posterior
division exhibits at the base a deep instriction.
The integuments, on the dorsal side, exceedingly hard
and very considerably- incrusted, as also, when examined
under the microscope, exhibiting a finely granulous
sculpturing.
The head about 3 times broader than long, above
rather prominently arched, with a slight, indistinct
impression along the middle. It juts out on either side as a
triangular, lamelliform projection, beset along the edges
with short bristles, and, anteriorly, separated by a slight
incision from the frontal margin. The latter is very faintly
incurved in the middle; for the rest, quite smooth.
The 1st free segment has the anterior margin deeply
concave, to serve for the reception of the head. Its lateral
portions, or epimera, not separated by any suture from the
segment, are somewhat anteriorly bent, lamelliform, and
terminate in a distinct, well-nigh rectangular corner. The
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