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67
Ankyroderma1 Jeffreysii, n. g., n. sp.
Tab. X. Fip. 1*2—1’». Tal» XI, XII.
Legemet cylindrisk, successivt afsraalnende mod begge
Ender med en yderst ru Overflade, der ved de 5 Par
Længdemuskler er afdelt i 5 Felter.
Den forreste Ende er tvers afskaaren, og i Midten
af Mundskiven, Fig. 13, sees den ründe Mundaabning, der
er stærk foldet paa langs, naar den er sammentrukket.
Den indre Del af Mundskiven er glat og lidt hvælvet. Fig.
13, a, den ydre Del dannes af 15 rørformige Forlængelser,
der ere bredere udad. smalere indad. Fig. 13, b, og
imellem hvilke sees 15, omtrent 0.5"" lange. 3delte Tentakler.
Fig. 13, c. 25. Strax bagenfor den forreste Kropsrand,
paa Rygsiden og omtrent midt imellem de to
Længdemuskler, findes en stor, enten graalighvid, eller gulagtig
fremragende Papille, i hvis Midte sees en rund Aabning for
Kjønsorganets Udførselskanal, Fig. 12. Fig. 13. d.
Kroppens bagerste Ende har en temmelig lang
hale-•formig Forlængelse, paa hvis Spids tindes den runde
Kloak-aabning, omgivet af 5 Papiller (Tænder), Fig. 12. 14.
Legemets Størrelse varierer noget, i Almindelighed
eidet 40"" langt, 18"" bredt paa Midten; men vi have to
. Exemplarer, der have en Længde af indtil 75"", og en
Bredde af 28"".
Huden er paa yngre Exemplarer tynd. og, naar den
er udspændt, halv gjennemsigtig, uden dog at Indvoldene
tydelig kunne sees; paa ældre Dyr er den fast, næsten
læderagtig og aldeles uigennemsigtig, saa at neppe
Længdemusklerne kunne skimtes. Dens ydre Flade, seet under
Loupen. er overalt forsynet med smaa runde Papiller, i
hvis Midte er en Aabning, hvorigjennem en Kalkstav
stikker frem, og imellem disse Papiller iagttages hist og her
smaa stjerneforinige Legemer, der dannes af et lidt ophøiet
Centrum, fra hvilket udgaar straaleformigt 5—6 Kalknaale.
Huden har som sædvanligt en glasklar, strukturløs
Cuticula, Fig. 24. a. et cellerigt Epithel, Fig. 24, &„ og
den egentlige Corium. bestaaende af fibrillært Bindevæv.
Fig. 24, c, indenfor hvilket Muskellaget med den flimrende
Peritonealbeklædning findes. Fig. 24, </.
Muskellaget bestaar af Tver- og Længdeinuskler.
Tvermusklerne. Fig. 15. a, danne en sammenhængende Hud.
der er afbrudt ved Længdemusklerue. Disse ere 5 Par. der
ere 4—5"" brede, med et Mellemrum af l""’s Bredde,
Fig. 15, 6.
Bindevævslaget (Corium) er meget rigt paa forskjellige
Slags Kalklegemer. der optræde under tre Hovedformer.
De smaa, runde eller elliptiske ere i størst Mængde
til-• stede, og sædvanligvis leirede i Grupper. Fig. 24. e, —
1 ayxvia = Anker, og — Hud.
Ankyroderma’ Jeffreysii, u. g., n. sp.
Pl. X, Hps. 12-1.-.; Pl. XI. XII.
Body cylindric. tapering gradually towards both
extremities, with an exceedingly rough surface, divided
by the 5 pairs of longitudinal muscles into as many
•sections.
Anterior extremity truncate. In the middle of
the oral disk, fig. 13, is seen the round oral aperture,
which, when contracted, exhibits deep longitudinal folds.
The inner portion of the oral disk is smooth and slightly
arcuate, fig. 13, a; the outer portion consists of 15 tubular
prolongations, broader externally, narrower internally, fig. 13,
b, and between which are seen 15 trifid tentacula, about
0.5"" long, figs. 13, c; 25. Immediately posterior to the
anterior margin of the body, on the dorsal surface and about
midway between the two longitudinal muscles, occurs a large
projecting papilla, partly greyish-white, partly yellowish,
in the centre of which is seen a round opening, for the
eferent duct of the generative organ, figs. 12: 13, d.
The posterior extremity of the body has a
comparatively long, caudiform appendage, on the tip of which is
seen the circular cloacal opening, surrounded by 5 papillæ
(teeth, dentelli). tigs. 12 ; 14.
The body varies in size, being however in most
individuals 40"" long and 18"" broad in the middle: but we
have in our possession two specimens with a length of 75""
and a breadth of 28"".
The .skin in young examples is thin and, when much
stretched, semi-transparent; the viscera cannot however be
distinctly seen. In . mature individuals, it is firm, almost
coriaceous in texture, and quite opaque, the longitudinal
muscles even being with difficulty discerned. Its outer
surface, when viewed under a lens, appears everywhere
furnished with small round papillæ, having in the centre
an aperture, through which protends a calcareous rod; and
between these papillæ are seen every here and there
minute stellate corpuscles, consisting of a slightly elevated
centre, from which radiate 5 or 6 calcareous spicules.
As is commonly the case, the skin consists of a
crystalline structureless cuticle, fig. 24, a, a cellular
epithelium, fig. 24. b. and the corium, composed of fibrillous
connective tissue, fig. 24, c, under which extends the muscular
layer with its vibratile peritoneal tunic, fig. 24, d.
The muscular layer is composed of transverse and
longitudinal muscles. The transverse muscles, fig. 15, a,
constitute a continuous integument, intersected by the
longitudinal muscles. The latter, of which there are 5 pairs,
have a breadth of 4""—5"". that of the space between
each pair being 1"". fig. 15, b.
Throughout the layer ol’ connective tissue (corium) occur
in great abundance various kinds of calcareous corpuscles,
comprised under three typical forms. The first is either
round or elliptic, and the corpuscles belonging to this
1 oryxupx. anchor: fitppz. »kiil.
9*
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