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21
Irpa1 aby88icola, n. g. 11. sp.
Tab. IV. Fig. 1, 2, X
Den Holothuride. vi nu skulle beskrive, har. som vi
senere skulle paavise, flere vigtige Berøringspunkter med
Slægterne Elpidia og Kolga; men adskiller sig dog
saameget fra dem. at vi have fundet det nødvendigt at danne
en ny Slægt for den. Desto værre maa vi beklage, at vi
kun have havt et enkelt Exemplar til vore Undersøgelser,
og selv dette var temmelig contraheret ved dets Opbevaring
i Spiritus. Det blev optaget fra et meget stort Dyb (1050
Favne), og under et overordentligt stormende Veir, saa det
ikke var muligt at anstille videregaaende Iagttagelser, medens
det levede.
Legemet er 21’"" langt, 6"" bredt, noget smalere
imod den forreste tvertrafskaarne Ende, som er forsynet
med 10 haandformig-fligede Tentakler, som sidde i en Krands
rundt Kroppens forreste Rand. Tab. 4, Fig. 1. 2.
Mundskiven er lidt hvælvet og foldet, og Munden sidder næsten
i Centrum, dog nærmere Bugfladen, Fig. 4". Legemets
bagerste Ende er afrundet, og paa dets Midte, nærmere
Rygsiden er den lidt^aflange Analaabning, Fig. 1. 2, a, a.
Kroppen har en udpræget Bug- og Rygside. Bugsiden
er lidt fladtrykt og glat, Fig. 1. Rygsiden er hvælvet, og
har paa den øverste Trediedel 2 paalangsgaaende Rækker
koniske Papiller, 4 i hver Række, imellem hvilke sees to
paatvers staaende større koniske Papiller. Rækkerne ere
konvergerende forfra bagtil, og hver Rækkes Papiller staa
lige overfor hverandre. De forreste Papiller ere fjernede
omtrent 3"" fra Kroppens forreste Rand, Fig. 2. Strax
bagenfor denne, imellem Grunden af 2 Tentakler, findes en
lille rund Aabning for Kjønsorganernes Udførselsgang, Fig.
2, b. Der, hvor Bug- og Rygsiden støde sammen, dannes
paa hver Side og paa den bagerste Ende en afrundet Rand,
og paa denne iagttages 24 cylindriske, stive Fødder, 9 paa
hver Side, og 6 paa Enden, Fig. 1, 2.
Dyrets Hud er læderagtig, seig og meget kontraktil;
den dannes af en klar, yderst tynd, gjennemsigtig,
strukturløs Cutieula, indenfor hvilken er et enkelt Epitkeüag af
Cylinderceller, der fæster sig til Læderhuden (Corium).
Denne er temmelig fast og bestaar af et stærkt fibrillært
Bindevæv, i hvis ydre Lag forskjelligformede Kalklegemer
ere leirede. Fig. 4, imedens i det indre findes spredte dels
Celler med et kornet Indhold, lig Semper’s Sliraceller, dels
forlængede Bindevævslegemer, og dels yderst smaa
Kalkkorn.
Irpa1 abyssicola, n. g. n. sp.
Pl. IV, figs. 1, 2, X
The Holothurian we are about to describe, exhibits,
as will afterwards be shown, several points of close
resemblance to the genera Elpidia and Kolga, but is on the
other hand so characteristically distinct from both, that we
do not hesitate to establish a new genus for its
reception. We have, we regret to say, been unable to obtain
more than a single specimen of this animal, and this
individual had become a good deal shrunk from being
preserved in spirits. It was brought up from a very
considerable depth (1050 fathoms), and in a heavy gale of
wind, so there was no possibility of instituting
comprehensive observations on the living animal.
The body measures 21"" in length and 6"" in breadth,
but is somewhat slenderer at the anterior truncated
extremity, which is furnished with 10 palmate-lobed tentacula,
encircling the anterior margin of the body, PI. 4, figs. 1, 2.
The oral disk is slightly arcuate, the mouth itself being
almost in the centre, a very little nearer the ventral
surface, flg. 4". The posterior extremity of the body is
rounded, and on the middle portion, slightly
approximating to the dorsal surface, occurs the somewhat ovate
anal aperture, fig. 1, 2, a, a.
The body has a distinct dorsal and ventral surface.
The ventral surface is slightly depressed and smooth, fig. 1.
The dorsal surface is convex, and exhibits on its upper
third two longitudinal series of conic papillæ, 4 in
each series, between which are seen two larger, transversely
placed conic papillæ. The series are posteriorly convergent,
and the papillæ in each opposite one to the other. The
foremost papillæ are removed about 3"" from the anterior
margin of the body, fig. 2. Immediately pQsterior to the
latter, between the bases of 2 tentacula, occurs a small
circular opening, for the genital duct, fig. 2, b. Where
the ventral and dorsal surfaces meet, extends on either
side of the body, and round its posterior extremity, a
continuous convexed margin, disposed along which are seen
24 cylindric, rigid suckers, 9 on each side, and 6
bordering the extremity.
The animal is covered with a tough, coriaceous, and
in a high degree contractile integument, composed of an
exceedingly thin, translucent, structureless cuticle, beneath
which is a single epithelial layer of cylindric cells, webbed
to the corium. The latter is firm in texture, consisting
of strong fibrillous connective tissue, with multiform
calcareous corpuscles dispersed through its outer layer, fig.
4; the inner exhibits a multitude of scattered cells,
containing a granulated substance, like that in Semper’s mucous
cells, and, exclusive these, elongate corpuscles of
connective tissue, and minute calcareous globules.
1 Irpa er en Sagngudinde, tilhørende den nordiske Mythologi.
Hun henregnedes til de onde Aander, som forlangte Menneskeofre
for de Tjenester, hun ydede.
1 A goddess of Northern Mythology. She was classed among
the evil spirits, being a malignant deity, to whom were offered human
sacrifices as the price of her favour.
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