Fam. Siipunculidæ, Baird. 
* Phascolosoma Lilijeborgii, n. sp. 
Tab. I., Fig. 1—4. 
Hele Legemets Længde udgjør paa de største Hxem- 
plarer 80””. Kroppen, Fig. 1, a, der er eylindrisk, 40” 
lang! 2” tyk, med en lidt konisk tilspidset Bagende, har 
en glat perlemorglindsende, næsten vandklar Hud, som kun 
sparsomt er besat med Papiller, der ere saa smaa, at de van- 
skeligen kunne sees med stærk Loupe, dog staa disse Pa- . 
piller noget tættere mod Snabelens Grund og paa den ba- 
gerste Del at Kroppen. 
Snabelen, Fig. 1, b, som neppe kan trækkes tuldkom- 
men ind i Kroppen, er 40”” lang, ligeledes glat, perlemor- 
mere . tætstaaende yderst 
glindsende,, forsynet "ned smaa 
Papiller, og har paa Enden en Krands af 8—10 korte, tem- 
"melig brede Tentakler, Fig. 1, c, der omgiver den runde 
Mundaabning. 
Aselbauningen rund ‘ved Snabelens Grund, Fig. il, å 
Huden dannes af et meget tykt, finstribet aimee 
(Cuticula), Fig. 3, a, 4,a, indenfor hvilket Epithelet (Matrix) 
findes, Fig. 3, D, 4, b, der bestaar af-et Lag temmelig store 
Cylinderceller. 
I Hpithellaget sees fornemmelig 
Mengde Kjertler, have en bred Grunddel, Fig. 
4, c, og en afsmalnende Udførselskanal, Fig. 3, d, 4, d, 
paa Snabelen en 
3, G; 
. som 
gaar igjennem den tykke chitinøse Cuticula, paa hvis Over- 
flade den aabner sig i en tragtformig Fordybning, Fig. 3, e, 
4, e.  Kjertelen dannes af en temmelig tynd Bindevævs- 
kapsel, Fig. 3, f, der påa den indvendige Flade er be- 
klædt med Epithel, som ogsaa beklæder Udførselsgangen, 
Fig. 3, 9,4 f. Flere af Kjertlerne indeholdt en Samling 
af klare Molekiler (Slim). Til Matrix støder et meget tyndt 
Bindevævslag, Fig. 3, h, 4, g, hvortil ‘den sædvanlige Mu- 
ssdlme er bunden, Fig. 4, h. LØ ' 
Der ér kun en ‘Retractor? som tager sit Udspring lige 
fargar Kroppens Midtpunkt med to temmelig lange it 
der, Fig. 2, a, følger Bugfladen, Fig. 2, 0, og fester sig 
fortil strax bagenfor Tentakelkrandsen. 
7 
der 
Fam. Sipunculidee, Baird. | 
Phascolosoma Lilljeborgii, ». sp. 
PI. I, figs. 1—4. 
The trunk, 
fig. 1, a, measuring 40"”” in length and 2”” in thickness, is 
Total length of the largest specimens 80”. 
cylindrical, with the posterior extremity slightly acuminate ; 
it has a smooth, nacrous, almost hyaline skin, sparingly 
furnished with papillæ, so minute as to be with difficulty 
of the 
the 
perceptible under a strong magnifier; on the base’ 
proboscis, and on the posterior portion of the trunk, 
disposition of these papillæ is somewhat closer. 
The proboscis, fig. 1, b., which can hardly admit of 
being wholly retracted within the trunk, is 40”” long, smooth, 
måerous, studded with exceedingly minute papillæ, and bears 
at its extremity a cincture of short and Jather broad ten- 
tacula, fig. 1, c, encircling the round buccal aperture. 
Anal opening circular at the base of the proboscis, 
Ie Ga 
The skin is composed of an extremely thick, finely 
fig 
striated chitinous layer (the .cuticle), figs. 3, a; 4, a, under- — 
neath which lies the epithelium (the matrix), figs. 3, b; 4,0, 
consisting of a layer of rather large cylindrical cells. 
In the epithelial layer — more especially on the pro- 
boscis — occur numerous glands, Broad at the base, figs. 3, c; 
4, c, and with a tapering excretory canal, figs. 3, d; 4, d,' 
which pierces the thick chitinous cuticle, on the surface of 
4, e. 
capsule of con- 
which it opens into a'funnel-shaped cavity, figs. 3, e; 
Each gland consists of a somewhat thin 
nective tissue, fig. 3, f, covered on its inner surface by the 
epithelium, which also invests the exeretory duct, figs. 3, g; 
4, f. glands contained an aggregation of 
pellucid molecules (mucus). to the 
extends {a very thin layer of connective tissue, figs. 3, hj 
4, g, to which is webbed the ordinary muscular integu- 
4, h. 
Several: of the 
C 5 * 
Contiguous: matrix 
ment, fig. 
There is only one retractor,, which takes its origin 
immediately posterior to. the medial point ot the trunk, with 
two longish raots, fig. 2, a, protends along the ventral sur- 
face, fig. 2, b, and is attached to the proboscis, in close 
to .the cincture of 
proximity tentacles. 
i 
