112 
24. Glyptonotus megalurus, G. O. Sars, n. sp. 
(PI. X, Pig. 1—23). 
Idotea Sabini, var. G. 0. Sars, Prodromus descriptions Crust, etc., 
No. 69. 
Chiridotea megalura, G. 0. Sars, Crustacea et Pycnogonida nova etc., 
No. 7. 
Artaeharacteristik. Legemet af a.flang Form, ikke 
fuldt 4 Gauge saa langt som bredt. Forkroppen naesten 
overalt af ens Brede. Bagkroppeu af saramo Lmngde som 
Forkroppen; Endesegmentet saerdeles stort og bredt, med 
Sidekanterne jevnt convexe og Enden konisk tilspidset, 
luestcn horizontal. Intet Spor af 0ine. 2det Par Fqlere 
med Skaftets 2det Led dannende udad en bred bprstebesat 
Lap, Svoben af samme Lsengde som Skaftets 3 sidste Led 
tilsanunen og bestaaende af 6 — 8 Led. Farven ensformigt 
graalig. Lmngden indtil 50“®. 
Findesteder. Stat. 35, 40, 183, 295, 353. 
Bemserkninger. Den her omhandlede kjsempemsessige 
Isopode viser en saa. stor habitnel Lighed med den afKroyer 
beskrevne Idotea Sabini, at jeg i Begyndelsen kun holdt 
den for en Yarietet af samme. Efter imidlertid senere at 
have undersdgt authentiske Exemplarer af sidstiuevnte Art, 
finder jeg dog, at begge disse Former, omend saerdeles nmr- 
staaende, dog maa adskilles som distincte Arter. Fra Ch. 
Sabini kjendes vor Form let ved den langt betydeligere 
Storrelse og afvigende Form af Bagkroppens Endesegment 
samt ved den ensformige graalige Farve. 
Beskrivelse. Legemet er (se PI. X, Fig. 1 og 2) af 
aflang Form, nrnsten 4 Gange saa langt som bredt, noget 
nedtrykt, dog med tennnelig stserkt hvfelvet Rygflade. For- 
kroppen er nrcsten overalt af ens Brede, medens Bagkroppen 
ved Basis viser en stank Indknibning. 
Integumenterne er paa Rygsiden meget haarde og 
stmrkt incrusterede samt viser under Mikroskopet en fint 
granuleret Skulptur. 
Hovedet er omtrent 3 Gange bredere end langt, oventil 
temmelig stmrkt hvaelvet, med en utydelig Indtrykning langs 
Midten. Det gaar til liver Side ud i en triangulser plade- 
dannet Fortsats, der i Kanteme er besat med korte Burster 
og fortil ved et lidet Indsnit skilt fra Panderanden. Denne 
er i Midten ganske svagt indbugtet, forovrigt ganske glat. 
lste Forkropssegment har den forreste Rand dybt 
concav for at kunne optage Hovedet. Dets Sidedele eller 
Epimerer, der ikke ved nogen Sutur er skilte fra Segmentet, 
er noget fortilboiedc, pladeformige og ender med et tyde- 
ligt, nmsten retvinklet Hjorne. Den bagre Rand er paa 
24. Glyptonotus megalurus, G. 0. Sars, n. sp. 
(PI. X, figs. 1—23). 
Idotea Sabini, var., G. 0. Sars, Prodromus descriptions Crust., etc. 
No. 09. 
Chiridotea megalura, G. 0. Sars, Crustacea et Pycnogonida nova, etc., 
No. 7. 
Specific Character. — Body oblong in form, not quite 
4 times as long as broad. Anterior division almost every- 
where 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 conically pointed, almost horizontal. No trace of 
eyes. Second pair of antennae 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 uni- 
form 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 
Kroyer’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 vprv 
closely approximating, must nevertheless be assigned specific 
distinctness. From Ch. 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 PI. X, figs. 1, 2) 
oblong in form, almost 4 times as long as broad, some- 
what depressed, though with the dorsal surface rather prom- 
inently arched. The anterior division of the body almost 
everywhere uniform in breadth, whereas the posterior divi- 
sion 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 sculp- 
turing. 
The head about 3 times broader than long, above 
rather prominently arched, with a slight, indistinct impres- 
sion 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 
