‘Tr, H. Théel har af det Materiale, der fra Challenger- 
expeditionen er overdraget ham til Bearbeidelse, fundet sig | 
foranlediget til, for Holothuridernes Vedkommende, at danne 
en ny Orden, som han kalder Elasmopoda*, og hvortil Fa- 
milien Hlpididæ med flere nye Slegter ere henførte. Til 
denne Familie maa vi føie følgende to Slægter, nemlig 
Kolga og Irpa. 
Kolga® hyalina, n. g. n. sp. 
(Tab. I-II) 
Dyret varierer noget i Størrelse; men de største Exem- 
plarer, vi have havt til vore Undersøgelser, ere 50”” lange, 
15—20"m hoje og 12—15”” brede. Kroppen er udpræget 
bilateral. Paa Legemets forreste, tvers afskaarne Ende 
sees den mod Bugfladen vendende Mundskive, paa hvis 
Midte findes den runde Mundaabning, Fig. 2, a, og hvis 
Rand er forsynet med 10 næsten retraktile Tentakler, Fig. 
2, 0. Disse ere i udstrakt Tilstand 4” lange, ere paa 
deres yderste Ende femlappede. Enhver Lap har 3 Flige, 
hvoraf den midterste er den længste og tykkeste, Fig. 6, 7. 
Bugen er næsten plan; kun naar Dyret er meget ud- 
spændt af Vædske, bliver den lidt convex. 
Ryggen er stærkt hvælvet, og henimod den forreste” 
Ende, omtrent 4”” fra Tentakelranden, findes en paatvers 
p 
gaaende kraveformig Fremstaaenhed, paa hvis buedannede 
Rand sees 6 cylindriske, konisk tilspidsede Papiller, af 
hvilke de 2 midterste ere de tykkeste og længste, omtrent * 
1.5”m lange, de to yderste ere temmelig smaa; men samt- 
lige ere paa deres Spidser hvidglindsende, Fig. 1, a. Disse 
Papiller (Rygfødder?) forkortes og forlænges uden egentlig 
at kunne trækkes ind i Legemet, og naar de ere saavidt 
sammentrukne, at kun Spidserne sees, da kunne de ganske 
skjules, idet Dyret drager en Hudfold (Grunden af Kra- 
ven) over dem ligesom en Kappe. Foran Kraven bliver 
Legemet smalere og mere rundt og danner en Slags Hals, 
idet den forreste Ende af Kroppen er noget bredere, saa 
* Preliminary Report on the Holothuride, of the exploring voyage 
of H. M. S. ‘Challenger.’ Bihang til K. Svenska Vet. Akad. Hand- 
‘lingar, B. 5, No. 19. å 
* En af Havgudindens Døttre i den nordiske Mythologi. 
The researches of Dr! H. Théel in connexion with 
materials from the ‘Challenger’ Expedition submitted to 
that naturalist for revision, have led him to institute a new 
order of Holothwriide, which he designates Elasmopoda, 
classing under it the family Elpididæ, with divers new genera. 
As additional members of that family, the two following 
genera, Kolga and Jrpa, must be referred. 
Kolga” hyalina, n. g. n. sp. 
(Pl. IID). 
This animal varies in size; but the largest specimens 
we have met with did not exceed .50”” in length, 15—20"” 
in height, and 12—15”” in breadth. The trunk is promi- 
nently bilateral. At the anterior, obtuse extremity of the 
body, facing the ventral surface, occurs the oral disk, in 
the centre of which is seen the round buccal aperture, fig. 
2, a, the margin being furnished with 10 almost retractile 
tentacula, fig. 2, b. These tentacula, when extended, are 
4m long, and, at their extremities, five-lobed. Each lobe 
is subdivided into 3 lobules, that in the middle being longest 
and thickest, figs. 6, 7. 
The belly is almost flat; only when the animal blows 
itself out with water, does the ventral surface assume 
some slight appearance of convexity. 
The back is sharply rounded, and near the anterior 
extremity, about 4”” from the tentacular margin, occurs a 
transverse jugal protuberance, along the arcuated border 
of which is seen a series of cylindric, acuminate papille, 
the medial pair thickest and longest, about 1.5”” in length; 
the outermost two are rather short: they are all of them 
tipped at the points with lustrous white, fig. 1, a. These 
papillæ (dorsal suckers?) are contracted and expanded 
at the will of the animal, though not strictly retractile; 
and when shrunk so as to leave the points only visible, 
they admit of being wholly concealed, the animal drawing 
over them a membranous fold (the base of the jugal protuber- 
ance), with which they are covered as with a mantle. 
Anterior to the jugal protuberance, or collar, as we may 
‘ Preliminary Report on the Holothuride, of the exploring voyage 
of H. M. S. Challenger.’ Bihang til K. Svenska Vet. Akad. Hand- 
lingar, B. 5, No. 19. 
2 One of the daughters of Ran, the sea-goddess of Northern Myth- 
ology. 
