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5
Randen, ere bladl’ormige meel den smalere Del vendt indad
imod Midtpartiet, og have paa deres Overflade 2—3 Korn,
Fig. 7 a. Skjoldets Centrum derimod dannes at" smaa
næsten runde, og paa den ydre Flade ophøiede Plader,
hvorat’ en sidder i Centrum, Fig. 7, b. Der, hvor Skjoldets
Rand ender, har Kroppen 5—6 Ringe, der ere besatte med
større og mindre Chitinpläder, som dels ere flade, dels
runde og ordnede saaledes, at de runde, der ere meget
smaa, altid sidde imellem de større flade, Fig. 7, c.
Omtrent 3mm foran Endeskjoldet er en Indsnøring
rundt Kroppen, Fig. 5, a, hvorefter denne aftager lidt i
Tykkelse imod Snabelens Grund, hvor der paa Rygsiden
findes det forreste Chitinskjold, Fig. 5, b. Dette er lidt
hvælvet, 4mm langt, 3mm bredt ved Basis, 1.2mn i Spidsen,
Fig. 8.
Skjoldets Rand, der især bagtil er meget ophøiet over
Hudfladen, er kraveformigt sammensat af temmelig
regelmæssige, aflange, hvælvede, fortil tilrundede’Plader, som ere
smalere ved Grunden, Fig. 8, a, og forlænge sig et lidet
Stykke indover Skjoldets Rand. Imellem disse Plader, det
vil sige der, hvor den ene Plade nærmer sig den anden,
er en lille Fure, Fig. 8 b, hvorved Randpladerne blive
saameget desto tydeligere. Den centrale Del af Snabelskjoldet
bestaar af runde, ophøiede Plader, som ere ordnede i
Rækker, der gaa fra Peripherien imod Centrum, Fig. 8 c.
Imellem disse Pladerækker findes ligeledes fine Furer.
Kroppens Overflade er besat med større og mindre
Chitinpläder, der ere grupperede omkring Aabningerne for
Hudkjertlerne, Fig. 11, 12, 13, dog saaledes, at imedens
de paa Kroppens Midtparti ere uregelmæssig leirede, sidde
de i temmelig regelmæssige Ringe strax bagenfor • det
forreste, og foran det bagerste Skjold. Den runde
Analaab-ning findes strax bagenfor det forreste Chitinskjold.
Snabelen er 16"™ lang, Fig. 5, og besat lige fra
Grunden til den^ forreste Ende med en stor Mangfoldighed af
Hager, der sidde paa omtrent 600 Ringe, Fig. 9. Hagerne
ere stærkt krumbøiede, hule langs den krumme" Rand, Fig.
10.1 Basaldelen er 0.028"1"’ og Høiden er 0.020mm, Fig. 10.
Tentaklerne, Fig. 5 c, ere fra 10—12, temmelig smaa
og sidde i Krands omkring den runde Mundaabning.
Hudens Cuticula er tynd, vandklar og strukturløs,
Fig. 12, a, 13, a, og dækker Chitinpladerne, Fig. 12, b, 13, b,
der ere leirede i den cellulære Matrix, Fig. 12, c, hvori’
findes mange Kjertier, som ere lidt langstrakte med en
bred Basis, Fig. 12, d, og en kort Udførselsgang, Fig. 12, é|
som aabner sig paa Kroppens Overflade med en liden Pore,
Fig. 11, a, 13, c, omgivet af uregelmæssig grupperede
Chitinpläder, Fig. 11, 12, 13.
Indenfor Matrix er et tyndt Bindevævslag, Fig. 12, f,
der støder til Muskelhuden, som er sammensat af
Ring-og Længdemuskler. Ringmusklerne Fig. 12, g, bestaa af
slender part turned towards the middle of the plate, and
having on their surface 2 or 3 granules, fig. 7, a. The
centre of the shield consists of exceedingly minute, almost
circular laminæ, raised on the outer surface, one of which occupies
the centre, fig. 7, b. Where the rim of the shield terminates,
the body exhibits 5 or 6 rings, covered with chitinous
plates, varying in magnitude, some flat, some raised, and
so disposed, that the raised plates, which are very minute,
invariably occupy a position between the comparatively
large flat ones, fig. 7, c.
About 3mm in advance of the terminal shield is seen
a constriction of the body, fig. 5, a, from whence the latter
diminishes in thickness to the base of the proboscis, where,
on the dorsal surface, occurs the foremost chitinous shield,
fig. 5, b.
This shield, which is slightly arcuate, measures 4mm
in length, 3mm in breadth, and 1.2mm across at the apex,
fig. 8. The rim of ,the shield, posteriorly projecting to a
considerable extent above the surface of the skin, is jugal
in form, and built up of comparatively uniform, oval, arcuate
plates, rounded off anteriorly, being narrower at the base,
fig. 8, a, they are produced a little within the rim of
the shield. Between these plates, occurs a small groove,
fig. 8 b, by reason of which the rim-plates are easier to
distinguish. The central portion of the shield on the proboscis
is composed of raised circular plates, proceeding in rows
from the circumference to the centre, fig. 8, c. Here, too,
minute furrows extend between the series of plates.
The surface of the body is furnished with chitinous
plates, of varying magnitude, grouped round the apertures
of the glands of the skin, figs. 11, 12, 13, — irregularly
on the medial region of the body, but immediately posterior
to the foremost and anterior to the hindmost shield, in
comparatively uniform annular series. The round anal
opening is placed immediately posterior to the foremost
chitinous shield.
The proboscis measures 16fflm in length, fig. 5, and is
studded from its base to its anterior extremity with a
multitude of chitinous hooks, affixed to aboat 600 annulets,
fig. 9. These chitinous hooks are much bent, and
hollowed out along their curved margins, fig. 10. Width of
basal portion 0.028""", height 0.020""", fig. 10.
The tentacles, fig. 5, c, from 10 to 12, are comparatively
small; they encircle, cincture-like, the round buccal aperture.
The cuticle, thin, translucent, and structureless, figs.
12, a; 13, a, invests the chitinous plates, figs. 12, b; 13, b,
disposed throughout the cellular matrix, fig. 12, c, which is
furnished with numerous glands, somewhat elongate in
form, with the base broad, fig. 12, d, and a short’ excretory
duct, fig. 12, e, opening on the surface of the body through
a small pore, fig. 11, a; 13, c, round which chitinous plates,
figs. 11, 12, 13, are irregularly grouped.
Underneath the matrix extends a thin layer of
connective tissue, fig. 12, f, contiguous to the muscular
integument, which is composed of annular and longitudinal
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