112 



24. Glyptonotus megalurus, G-. 0. Sårs, n. sp. 



Pl. X. Fig. 1—23). 



Idotea Sabini, var. (i. 0. Sårs. Prodromus descriptionis ('rust. etc, 



No. ti". 

 Chiridotea ra, G. 0. Sårs. Crustacea et Pycnogonida nova etc., 



No. 7. 



Artscharaeteristik. Legemet af aflang Form. ikke 

 fuldt 4 Gange saa. langt som bredt. Fortroppen næsten 

 overalt af ens Brede. Bagkroppen af summe 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 udåd en bred børstebesat 

 Lap. Svøben af samme Længde som Skaftets 3 sidste Led 

 tilsammen og bestaaende af 6 — 8 Led. Farven ensformigt 

 graalig. Længden indtil 50""". 



Findesteder. Stat. 35. 40, 183, 295, 353. 



Bemærkninger. Den her omhandlede kjæmpemæssige 

 Isopode viser en saa stor habituel Lighed med den af Kroyer 

 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. 

 linder jeg dog. at begge disse Former, omend særdeles nær- 

 staaende, dog maa adskilles som distincte Arter. Fra CJi. 

 Sabini kjendes vor Form let ved den langt betydeligere 

 Størrelse og afvigende Form af Bagkroppéns Endesegraent 

 samt ved den ensformige graalige Farve. 



Beskrivelse. Legemet er (se Pl. X, Fig. 1 og 2) af 

 aflang Form, næsten 4 Gange saa langt som bredt, noget 

 nedtrykt, dog med temmelig stærkt hvælvet Rygflade. For- 

 kroppen er næsten overalt af ens Brede, medens Bagkroppen 

 ved Basis viser en stærk Indknibning. 



Integumenterne er paa Rygsiden 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. 



Iste Forkropssegment har den forreste Rand dybt 

 concav for .-it kunne optage Hovedet. Dets Sidedéle eller 

 Epimerer, der ikke ved nogen Sutur er skilte fra Segmentet, 

 er noget fortilbøiede, pladeformige og ender med et tyde- 

 ligt, næsten retvinklet Hjørne. Den bagre Rand er paa 



24. Glyptonotus megalurus, G. 0. Sårs, n. sp. 



(Pl. X. nus. 1—23). 



Idotea Sabini, var., G. O. Sårs, Prodromus descriptionis Crust., etc. 



No. 69. 

 Chiridotea megalura, Gr. 0. Sårs, 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 conieallv pointed, almost horizontal. No trace of 

 eves. 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 -tåken together. 

 and consisting of from 6 to 8 articulations. Colour a uni- 

 form grev. Lensth 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 niere variety of that form. Meanwhile, having sincé 

 examined authentic specimens of the latter speeies, I am novv 

 clearly of opinion that the tvvo aforesaid forms, though very 

 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 Pl. 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 niieroscope, 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 niiddle. It juts out on either side as a 

 triangular, lamelliforin 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 niiddle; for the rest. quite smooth. 



The Ist 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 



