"naar den første Fod, 
er der to Høreblærer, 
ere sammensatte af concentriske Ringe, Tab. IL, Fig. 
- Fremstaaenhed, Fig. 
ikke alene til Muskellaget, 
temmelig tyk Gren, 
-hvoraf det -yderste er det korteste, Fig. 18, a. 
Blærer, der indeslutte Otolither, hvilke ligge. en paa hver 
Side af Nerven, netop paa det Sted, hvor Radialmuskelen 
insererer sig, førend Nerven skjules af denne, Fig. 30, d, 
e, f. Hvor de to Rygnerver ligge imellem Længdemusklerne 
og Huden, afgive de en Mengde temmelig tykke Grene 
men ogsaa til Huden, hvori de 
forgrene sig, Fig. 31, anastomosere med hverandre og ende 
i Hpithellagets Celler, Fig. 32. Foruden disse Hud- og 
Muskelgrene sende de ogsaa dels 1, dels 2 Grene til hver 
Rygpapille. i hvis Hud de udbrede sig. 
Den midterste Radialnerve paa Bugfladen løber imel- 
lem Længdemuskelen og Huden og afgiver Grene til begge, 
dog synes Nerveforgreningerne langtfra at være saå rige 
paa Bugen, som paa Ryggen. 
De to Side-Radialnerver løbe, 
skiven, bagtil imellem Radialkarret og Huden. Enhver af 
dem afgiver, lidt bagenfor Længdemusklernes Insertion, 1 
Gren til den første Høreblære, der ligger omtrent midt paa 
Nery estammen, Fig. 30, g, g, og fra nu af, og indtil den 
sender 
anden liggende Høreblærer: Til første Fod afgiver den en 
ligesom til en. Høreblære, der ligger 
I det Rum, som findes imellem Iste og 2den 
ddie og 4de, 4de og dte, dte og Gte, 
Fig. 26, c, ¢, i Rummet mellem de 
øvrige Fødder er der kun en Blære. Enhver af disse Blæ- 
rer forsynes med en Nervegren, og 'desforuden er der ved 
Grunden af hver Fod en Blære, der ligeledes faar sin Nerve 
fra Radialstammen, Fig. 26, d; ialt er der altsaa paa hver 
Side 26 Høreblærer. Radialstammen afgiver 
(irene til Sidepartiets Hud og til Musklerne. 
ved Foden. 
Fod, 2den og 3die, 
fremdeles 
De nævnte Høreblærer ere runde, Fig. 33, a, a, noget 
forskjellige i Storrélse; størst ere de to Par, 
paa Ryggen, omtr. 0. 25 m og mindst ere de, 
-Som findes 
som firides 
paa den forreste og bagerste Ende af Kroppen, omtrent 
0.06—0.087”, Paa Midten af denne ere de fra 0. 16—0,19”™. 
De dannes af en temmelig fast, hyalin Bindevæysmembran, 
Fig, 34, a, der stilkformig forlænger sig hen til Nervestam- 
men; idet den omfatter Nervegrenen, som gaar til Blæren. 
Den indvendige Flade af Blæren er beklædt med et Epi- 
thellag, Fig. 34, b. Imellem dette udbreder Nerven sig, 
Enhver Blære indeholder en Mengde, dels aflange, dels 
runde. Otolither, fra 20—130, Fig. 33, a, 34, c. De runde 
Pde 
de ‘aflange dannes af Lag, der ligge paa hinanden,. og 
Paa: 
ene Ende af disse Otolither sees en liden. rundagtig 
IG, å : 
idet de forlade Mund-.- 
den 5 Grene til 5 efter hin- 
den 
15 
sive of these tegumentary and muscular offshoots, 
trunk, 
behind the oral disk, they furnish that organ 
in its integument. The 
both furnish- 
On passing 
with several offshoots, 
two radial dorsal nerves branch dichotomously, 
‘which ramify 
‘ing an offshoot to each of the large vesicles, enclosing Oto- 
liths, placed one on either side. of the nerve, at the-exact 
point where the radial muscle issues; previous to its con- - 
cealing the nerve; fig. 30, d, e, f.. The two dorsal nerves, 
where they extend between the longitudinal muscles and the 
skin, furnish a number of rather thickish branches not only 
to the muscular layer, but also to the integument, 
they ramify, fig. 51, anastomosing one with the other, and. 
terminating in the cells of the epithelium, fig. 32.  Exclu- 
ramifica- 
sometimes 1. 
in which 
tions proceed to each dorsal: papilla, some- 
_times 2, in the skin of which they spread. 
The medial radial nerve on the surface of the belly 
and. the. 
the nervous ramifica- 
extends between the longitudinal muscle 
ment, furnishing both with branches; 
tions, 
the ventral than on the dorsal surface. . 
The two lateral radial nerves take a’ backward course 
from the oral disk, between the radial vessel and the skin. 
A little posterior to the point of insertion of the longitudinal 
muscles, each of these nerves furnishes’ a branch to the first 
auditory vesicle, placed about midway on the nervous 
fig. 30, g, g; from this point to the first sucker, 
it sends forth 5 separate -offshoots to as many success- 
disposed auditory vesicles. The first sucker, 
at its base, are furnished each 
In the spaces 
however, would appear to be far less numerous on 
trunk, 
ively and 
an auditory vesicle 
a thickish branch. 
with 
intervening . between 
the first | and second, the second and third, the third 
and fourth, the fourth and fifth, and the fifth and Sixth, 
occur two auditory vesicles, fig. 26, cc; in the spaces * 
between the remaining pairs of suckers, only one. Each of 
these vesicles is provided with a nervous branchlet; and at 
the base of every sucker occurs a vesicle, 
proceeds from the radial trunk, fig. 26, d; each side has 
accordingly, all; 26 auditory vesicles.’ Moreover, the 
radial trunk also furnishes the lateral portion of the integu- 
whose nerve 
in 
ment and the muscles with branches. 
The auditory vesicles, which are globular in fom, fig 
33, a, a, vary somewhat in magnitude; the largest, are the 
two pairs on the.back, measuring about 0.25”, the smallest, 
those at the anterior and posterior extremities of the trunk, 
which measure 0.06””—0.087”. In the medial region they are 
from 0.16" to 0.1977 in diameter. They consist of a compara- 
tively firm, hyaline membrane of connective tissue, fig. 34, a, 
which extends as a pedunculate appendage to the nervous 
enclosing the nervous branch that goes to the ves- 
icle. The inner surface of the vesicle ds covered by an 
epithelian layer, fig. 34, b. Throughout the latter the nerve 
spreads. Every vesicle contains a number (20—130) of 
Otoliths; part oval and part circular, figs. 33, a; 34, c. 
The round Otoliths are built up of concentric rings, the 
oval of divers caleareous layers, lying one upon the other, 
the outermost layer being the shortest, fig. 18, a. 
extremity of these Otoliths, is frequently 
roundish prominence, fig. 18, 0. 
At one 
seen a small 
integu- °° 
