182
'
,
them by this cloak of invisibility is Very great, and as they
'
are-not very «active animals and
numerous
in the shore waters where they live, they possibly owe
.
their survivalto the factthat they are able to escape any
.
most careful scrutiny.
'
'
Anyone who has ever examined a living squid, or one
that has only very recently died, cannot fail to have been
impressed by the wonderful play of colour which
over the torpedo—shaped body which blushes with delicate
.
colour, and
as quickly blanches.
In this Case also the
colour is controlled by ”tiny pigment cells, or “
chromatophores,Î’ in the skin, but-these are of
different nature
—
from those of the Æsop prawn;
_
Each one«contains one colour
Only and this is not spread into branches or withdrawn—
according to whether or no it is-heeded, but instead the
whole pigment Cell is_ expanded or, contracted by tiny
…muScles attached to the corners and]in this way the area
displaying thatpa‘rticular colour is increased or
(Plate74); In this case the value of=the coloürchangeisfa1*
_
.
frômobviousg‘gis the .,squids are Swiftly movingcanimals Whichsurface bf«the sea with
'
“
which
their bodies—.; 1 As —in; the,
,.-alliedccuttle—sh
Changes lof. colour appear to
_
be, in aÏsense,
._g—
‘
.
: Many sh ”have
Of colour ‘,Ghange.;_ Especially
.,:1sthlste
111
at—sh,suchas ,te,.Sble,
-
habletobe attacked from above Ifthey are exammed
'
.
1tW1ubeseenthatwhereastheunder s1deofthe bodywhmh
.
*
lies on thebettom
i . —_
*
,
.
;
67) Here
—
phgmentcellsm theskmareresponæble