nautili
nautilus 的復數形
nautilus 的復數形
Nautilus \
Nau "
ti *
lus \,
n .;
pl .
E . {
Nautiluses },
L . {
Nautili }.
[
L .,
fr .
Gr .
nayti `
los a seaman ,
sailor ,
a kind of shellfish which was supposed to be furnished with a membrane which served as a sail ;
fr .
nay ^
s ship .
See {
Nave }
of a church .]
1 . (
Zool .)
The only existing genus of tetrabranchiate cephalopods .
About four species are found living in the tropical Pacific ,
but many other species are found fossil .
The shell is spiral ,
symmetrical ,
and chambered ,
or divided into several cavities by simple curved partitions ,
which are traversed and connected together by a continuous and nearly central tube or siphuncle .
See {
Tetrabranchiata }.
[
1913 Webster ]
Note :
The head of the animal bears numerous simple tapered arms ,
or tentacles ,
arranged in groups ,
but not furnished with suckers .
The siphon ,
unlike ,
that of ordinary cephalopods ,
is not a closed tube ,
and is not used as a locomotive organ ,
but merely serves to conduct water to and from the gill cavity ,
which contains two pairs of gills .
The animal occupies only the outer chamber of the shell ;
the others are filled with gas .
It creeps over the bottom of the sea ,
not coming to the surface to swim or sail ,
as was formerly imagined .
[
1913 Webster ]
2 .
The argonaut ; --
also called {
paper nautilus }.
See {
Argonauta },
and {
Paper nautilus },
under {
Paper }.
[
1913 Webster ]
3 .
A variety of diving bell ,
the lateral as well as vertical motions of which are controlled ,
by the occupants .
[
1913 Webster ]
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