141 



Colossendeis angttsta, G. 0. Sårs. Pycnogonidea borealia & 

 arctica, No. 43. 



Artscharacter. Legemet meget smalt, lineært, med 

 forholdsvis korte og vidt adskilte Sidefortsatser ; Pande- 

 delen noget udvidet, triangulær. Halesegmentet smalt 

 cylindriskt, \ ;i saa langt som Kroppen. Snabelen lige for- 

 tilrettet, neppe bredere, men noget længere end Kroppen, 

 cylindrisk. lidt fortykket paa Midten. Øieknuden stærkt 

 ophoiet, dannende et koniskt tilspidset. noget foroverbøiel 

 Fremspring. Følerne stærkt forlængede, 3die Led størst, 

 8de Led særdeles kort, skjævt afskaaret i Enden, de 2 

 ydre Led omtrent at' ens Lrengde. De falske Fødder, lige 

 udstrakte, '/. 2 Gang længere end Legemet, -ide og 6te Led 

 at' ens Længde. Gangfodderne særdeles spinkle og forlæn- 

 gede, næsten 3 Gange længere end Legemet, det indbyrdes 

 Forhold af Leddene omtrent som hos foregaaende Art; 

 dog Forskjellen mellem Tarsal- og Fodleddet mindre, og 

 Endekloen betydelig længere. Farven tagstensrod. Lege- 

 mets Længde 19»""; Spandvidde 123""". 



Bemærkninger. Nærværende Art er let kjendelig 



fra foregaaende ved den langt smækrere Kropsform, den 

 smale eylindriske Snabel og de vidt adskilte Sidefortsatser. 

 Derimod kommer den saa særdeles nær en af Hoek fra 

 Challenger-Expeditionen beskreven Form, C. gracilis, at jeg 

 vikle have været tilboielig til at identificere begge med 

 hinanden, hvis ikke denne sidste Forms Forekomst (i det 

 antarktiske Hav) ganske synes at maatte forbyde en saa- 

 dan Identification. 



Beskrivelse. De under Expeditionen tagne Exem- 

 plarer har alle omtrent en Længde af 19""" og en Spand- 

 vidde af 123""". Denne Form opnaar saaledes en ret 

 anselig Størrelse, skjøndt den i saa Henseende staar langt 

 tilbage for foregaaende Art. 



Legemets Form er (se Pl. XV, Fig. 2), i Modsret- 

 ning til hvad Tilfældet er hos foregaaende Art, særdeles 

 spinkel, baade hvad selve Kroppen og Lemmerne angaar. 

 Da Integumenterne er af betydelig Fasthed, faar det hele 

 Legeme ved Siden af sin spinkle Form ogsaa en eiendom- 

 melig Stivhed i alle Dele. 



Selve Kroppen (Fig. 2 a, 2 b, 2 e) er af smal cylin- 

 drisk Form, fuldkommen lige, og, som hos foregaaende 

 Art. nden ethvert Spor af Segmentering. Sidefortsatserne 

 er forholdsvis korte, neppe længere end Kroppen er bred, 

 men - - ligeledes ganske i Modsætning til hvad Tilfældet 

 er hos C. proboscidea — skilte ved meget brede Mellern- 

 rum. Pandedelen er ganske kort, af triangulær Form og 

 noget bredere end den øvrige Krop, uden imidlertid at 

 være skilt fra samme ved nogen egentlig Hals. Haleseg- 

 mentet, der som hos foregaaende Art er skarpt afsat fra 

 Kroppen, er særdeles smalt, horizontalt bagudrettet og 

 af cylindrisk Form, eller ganske lidt fortykket i sit ydre 

 Parti. 



Kroppens Overflade er ganske glat, uden Spor af 

 Haar eller Torner. Under Mikroskopet viser de læder- 



Colossendeis angusta, <t O. Sårs, Pycnogonidea borealia & 

 arctica. No. 43. 



Specific Characters. Body very narrow, linear, with 

 relativcly short and widely separated lateral processes; 

 frontal part somewhat expanded, triangular. Caudal seg- 

 ment narrow. evlindrical. l / 3 of the length of the trunk. 

 Proboscis directed straight forward, scarcely broader, bul 

 somewhat longer tlian the trunk. evlindrical. slightly tume- 

 ficated at the middle. Ocular tubercle strongly protuberant, 

 forming a conical acute prominence bent somewhat forward. 

 Palpi greatly elongated, the 3rd joint largest, the 8th joint 

 particularly short, obliquely truncated at tin- extremity, 

 the 2 outer joints about equal in length. False legs, 

 straightly extendcd. ' ., longer than the body, the 4th and 

 6th joints equal in length. Ambulatory legs particularly 

 slender and elongated, almost 3 times longer than the body, 

 the mutual relations of the joints about the same as in the 

 preceding species; but the difference between the tarsal and 

 propodal joints is less and the terminal claw is consider- 

 ably longer. Colour brick-red. Length of the body 19""". 

 Extent 123'""'. 



Remarks. The present species is easily distinguished 

 trom the preceding one, by its far more slender shape 

 of body, the narrow cylindrical proboscis and the widely 

 separated lateral processes. On the other hand, it ap- 

 proximates so very closely to C. gracilis, a form described 

 by Hoek from the Challenger Expedition. that I would 

 have been disposed to identify them with each other if 

 the occurrence of the last-named form (in the Antarctic 

 Ocean) did not appear to forbid such an identification. 



Deseription. The specimens obtained during the 

 Expedition have all a length of about 19""" and an extent 

 of 123'"'". This form attains, thus. quite a respectable size. 

 although, in this respect, it falls far behind the preceding 

 species. 



Tlie shape of the body (see Pl. XV, fig. 2j is. in 

 opposition to what is the case in the preceding species, 

 particularly slender, both as regards the trunk and the 

 limbs. As the integuments have a considerable consistency 

 the entire body obtains, in addition to its slender form, 

 also, a peculiar rigidity in all its parts. 



The trunk itself (fig. 2 a, 2 b, 2 c) is narrow, cyl- 

 indric in form, perfectly straight and, as in the preceding 

 species, is without the slightest -trace of segmentation. The 

 lateral processes are relativcly short. scarcely longer than 

 the trunk is broad, but — also quite in opposition to what 

 is the case in C. proboscidea — separated by verv broad 

 interspaces. The frontal part is quite short. triangular in 

 form. and somewhat broader than the rest of the trunk. 

 without. however, being separated from it by any real 

 neck. The caudal segment whieh. as in the preceding 

 species, is sharply derined from the trunk, is particularly 

 narrow, horizontally directed backwards and cylindric in 

 form, or quite slightly tumeficated in its outer portion. 



The surface of the trunk is quite smooth, without 

 trace of setæ or aculei. Under the microscope the coriace- 



