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141
Colossendeis augusta, G. O. Sars, Pycnogonidea borealia &
arctica, No. 43.
Artscharaeter. Legemet meget smalt, lineært, med
forholdsvis korte og vidt adskilte Sidefortsatser;
Pandedelen noget udvidet, triangulær. Halesegmentet smalt
cylindriskt, l/3 saa langt som Kroppen. Snabelen lige
fortilrettet, neppe bredere, men noget længere end Kroppen,
cylindrisk, lidt fortykket paa Midten. Øieknuden stærkt
ophøiet, dannende et koniskt tilspidset, noget foroverbøiet
Fremspring. Folerne stærkt forlængede, 3die Led størst,
8de Led særdeles kort, skjævt afskaaret i Enden, de 2
ydre Led omtrent af ens Længde. De falske Fødder, lige
udstrakte, ’j-, Gang længere end Legemet, 4de og lite Led
af ens Længde. Gangfødderne særdeles spinkle og
forlængede, 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 tagstensrød.
Legemets Længde 19™"; Spandvidde 123’"".
Bemærkninger. Nærværende Art er let kjendelig
fra foregaaende ved den langt smækrere Kropsform, den
smale cylindriske Snabel og de vidt adskilte Sidefortsatser.
Derimod kommer den saa særdeles nær en af Hoek Ira
Challenger-Expeditionen beskreven Fonn, C’, gracilis, at jeg
vilde have været tilbøielig til at identificere begge med
hinanden, hvis ikke denne sidste Forms Forekomst (i det
antarktiske Hav) ganske synes at maatte forbyde en
saadan Identification.
Beskrivelse. De under Expeditionen tagne
Exemplarer har alle omtrent en Længde af 19™"’ og en
Spandvidde 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 PI. XV, Fig. 2), i
Modsætning 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 Fonn ogsaa en
eiendommelig Stivhed i alle Dele.
Selve Kroppen (Fig. 2 a, 2 b, 2 c) er af smal
cylindrisk Fonn, fuldkommen lige, og, som hos foregaaende
Art. uden 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
Mellemrum. 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 Turner. Under Mikroskopet viser de læder-
Colossendeis augusta, G. O. Sars, Pycnogonidea borealia &
arctica, No. 43.
Specific Characters. Body very narrow, linear, with
relatively short and widely separated lateral processes;
frontal part somewhat expanded, triangular. Caudal
segment narrow, cylindrical, */3 of the length of the trunk.
Proboscis directed straight forward, scarcely broader, but
somewhat longer than the trunk, cylindrical, 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 the extremity,
the 2 outer joints about equal in length. False legs,
straightly extended. ’/„ longer than the body, the 4th and
Uth 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
considerably longer. Colour brick-red. Length of the body 19™’".
Extent 123™".
Remarks. The present species is easily distinguished
from 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
approximates 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.
Description. 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.
The shape of the body (see Pl. XV, fig. 2) 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,
cylindric in form, perfectly straight and, as in the preceding
species, is without the slightest-trace of segmentation. The
lateral processes are relatively short, scarcely longer than
the trunk is broad, but — also quite in opposition to what
is the case in C. proboscidea — separated by very 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 which, as in the preceding
species, is sharply defined from the trunk, is particularly
narrow, horizontally directed backwards and cylindric in
form, or quite slightly tumefieated in its outer portion.
The surface of the trunk is quite smooth, without
trace of setæ or aculei. Under the microscope the coriace-
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