stærke Muskelbundter, som 'sammenbindes ved Bindevæv 
til en sammenhængende Membran, hvilket ogsaa er? Til- 
iældet med Længdemusklerne, hvis Bundter dog staa'læn- 
gere «fra hverandre, hvorved Huden paa enkelte Steder af. 
Kroppen faar ved gjennemfaldende Lys et gittret Udseende, 
18, 13, (0. 
Der, hvor det forreste Skjold danner en Fremstaaenhed 
paa den udvendige’ Flade af Kroppen, er en tilsvarende 
Fordybning paa deu indvendige Flade, Fig. 6, a, og om 
hvilken, (egentlig om Skjoldranden), Ringmusklérne danne 
en temmelig tyk Vold, hvorved Hullieden bliver” dybere, — 
og paa denne Vold teste den Del at Længdemusklerne sig, 
hvilke løbe langs Rygfladen; thi de gaa, ligesaa lidt som 
Ringmusklerne, over Skjoldhulen. Derimod er denné for- 
synet med et: eget Muskelapparat, der bestaar af 20 isole- 
rede Muskler, Fig. 6; 0, 14, a, som have en sølvglindsende 
Farve, og tage deres Udspring lidt udenfor den føromtalte 
Vold, gaar dækket af denne néd i Skjoldhulheden, hvor de 
fæste sig dels paa Midten, dels paa den forreste Trediedel 
af den indre hule Skjoldvæg. De midterste ere de lengste og 
have lige Retning, Fig. 14, 0; men alt eftersom de tage Ud- 
spring ira Sidérne og fortil, Fig. 14, a, c, blive de kortere 
og faa da en skraa Retning, saa at det Hele antager Formen 
af en Glorie, Fix. 14. Disse Muskler synes at være be- 
stemte til at dirigere Skjoldet. Den midterste og forreste 
Del at Skjoldhulen er kun beklædt at Peritoneum, der 
*forresten giver hele Muskelhudens indre Flade, sit Overtræk:. 
hå 
Imod den bagerste Kropsende, ved den tidligere om- 
talte Fure, blive Ringmusklerne noget tykkere og bidrage 
derved til at danne .den iør beskrevne Atdeling, Fig 5, c,. 
paa Kroppens Overflade. 
Saavel Ring- som Længdemusklerne ende ved det ba- 
gerste Skjolds Rand, hvis indvendige Flade er næsten plan. 
Der er kun en Retractor, der tager sit Udspring paa 
Endeskjoldets indre Flade, nærmere Bugsiden, med to Rød- 
der, Fig. 6, c, og følger saa denne lige op til Spiserøret, 
Fig. 6, d, som den forstørstedelen omgiver som en Skede, 
indtil den ester sig strax bagenfor Tentakelkrandsen, 
Hiss OG & 
Spiserøret. Fig.6,f, der er eylindrisk, smalt og tildels 
indesluttet af Retractor, gaar ved en lille Indsuøring: over 
i den lidt bredere Tarm, som spiralformig gaar bag til Krops- 
hulhedens Ende, Fig. 6, g, bøler sig tortil iremdeles i Spi- 
raler, indtil den gaar over i en temmelig kort Rectum, Fig. 
6; h, der aabner sig paa Ryesiden, strax bagentor det for-, 
2 9 ken) Je ? ken) 
reste Skjold. 
Tarmspiralen er fæstet til det bagerste Skjolds indre 
Flade ved enkelte Bindevævstraade, 
sin. forreste Ende bundet til Huden ved mange fine mu- 
skuløse Traade. 
og Rectum er paa 
museles. The former, fig. 12, b, are built up of powerful 
muscular fascicles, webbed together as a continuous mem- 
brane by connective tissue; this is likewise the case with 
the longitudinal muscles, the fascicles of which are, however, 
less closely arranged, giving to the skin, when held up to 
the light, in certain parts of the body a tessellated ap- 
pearance, fig. 12, h. 
On the outer surface of the body, occurs a promi- 
nence, formed by the shield; and on the inner surface, is 
seen a corresponding depression, fig. 6, a, round which (or 
rather, round the rim of the shield) the annular muscles 
constitute a thickish ridge, increasing the depth of the ex- 
cavation: to this ridge are attached such of the longitudinal: 
muscles as extend along the dorsal surface; for neither 
the longitudinal nor the annular’ muscles cross the hollow of 
the shield. The shield is provided with a special muscular 
apparatus, viz. 20 isolated muscles, figs. 6, b; 14, a, of a 
silvery lustre, originating a little without the aforesaid ridge, 
under cover of which they pass down into the hollow of 
the shield, and are’ there attached, either to the middle 
The 
medial muscles are the longest, and’ protend in a right, line, 
or to the anterior third of the hollow innér wall. 
fig. 14,0; but the nearer the point of origin approaches the 
sides or the front part, tig.,14,d, c, the shorter and more 
oblique do the muscles become, causing the whole’ assemblage 
to resemble a halo, fig. 14. These muscles would seem to 
govern the. shield. The middle and tront “part of the 
hollow “is covered by the peritoneum alone, which also 
‘invests the inner suriace of the whole muscular integument. 
Near the posterior extremity of the body, along the 
groove noticed above, the annular muscles slightly increase 
in thickness, and thus contribute towards forming the sec- 
tion of the surtace of the body, fig. 5, ¢, previously de- 
scribed. 
Both the annular and the longitudinal muscles terminate 
at the rim of the posterior shield, the inner surface of which 
is almost flat. 
This animal has but one retractor, which, springing 
from two roots, fig. 6, ¢ takes its origi on the inner 
surface of the terminal shield, nearest the ventral side, 
protending along the latter till it reaches the æsophagus, fig. * 
6, d, which it almost surrounds, in the form of a sheath, , 
being attixed immediately posterior to the cincture of tent: 
acles, fig. 6, e. v å | 
The æsophagus, fig 6, f, eylindrie, slender, and partially 
enclosed by the retractor, passes, with a slight istriction, 
into the somewhat wider intestine, which coils spirally back - 
to the termination of the perivisceral cavity, fig. 6, g, from 
whence, making a bend forwards, it continues on, twisting 
spirally as before, till it enters a comparatively, short rectum, 
fig. 6, h, which opens on the dorsal surface, immediately 
posterior to the foremost shield. | 
The spiral of the intestine is attached to the inner sur- 
face of the hindmost shield by a few filaments of con- 
nective tissue, and the rectum webbed to the skin at its 
anterior extremity by numbers of delicate muscular filaments. . 
