50
-’IHÈ SEÀS
‘
de'veloped ; thoSe which deposit adheSive spawn— on to
_
stones, sea weed or
andthose inWhich ’eggs
and
young are
”to the body
parent.
the rst division are the sea urchins‘, starsh,
brittlestars,
many '
worms,
‘bàmacles
and? the
bivalve
molluscs.Since the chances or: destruction are eXcessively
f
great, the number ofi'eggïs shed is correspondingly.large, a
striking example of Which»i‘s supplied by oneof the larger
’
American =oysters, which -is said? to produce . roo,ooo,ooo
eggs annually'!
'
If a sea urchin or mussel be Watched when
-
spawning, it Will— be seen to discharge a cloudy uid which;
_
.
.
on microsœpical examination, Will be found toxconsist of
incredible numbers
or sperm.
Yet so great are-the
,
dangers to “=Which=‘-theSe unprotected young are exposed
that -‘the= race 'd0esï rio more than hold its own !
-
-
'
'
If '
Search .be
the rocks during the spring,mahÿ=—kinds of‘-'spawu will be found.
Common on the
,
under side of rocks are 'theegg—c‘apsùles of the dog—whelk
'
(Plate 13), whichlook like grains of corn, and are attached
by short stalks,
groups of fty, a hundredor
even more.
Each consists of a tough case, containing a
number of developing embryOS,—amongst which there is the
'
keenest
competition, the weaker' being eaten by" the
.‘
stronger, so that nally only the
or two strongest emerge.
,
The sea slugs provide the mOSt diverse and ornamental
Spawn, covering the rocks with ribbons of jelly, often
beaùtifülly coloùred, in which he embedded the developing
eggs;
The common sea lemons (Plate 17) lay their eggs
in a broad band of pure
always arranged in a triple
coil, some fteen inches long and about one inch wide, the
-
margin'being unusually .wavy. ©ver half a million eggs
‘
maybe laid in a single ribbori, for the young batch outat a .
'
very early: and unpœtected stage.
The spawn of other
‘
sea slugs‘ shows
peculiarities, some consisting of spirals
-’IHÈ SEÀS
‘
de'veloped ; thoSe which deposit adheSive spawn— on to
_
stones, sea weed or
andthose inWhich ’eggs
and
young are
”to the body
parent.
the rst division are the sea urchins‘, starsh,
brittlestars,
many '
worms,
‘bàmacles
and? the
bivalve
molluscs.Since the chances or: destruction are eXcessively
f
great, the number ofi'eggïs shed is correspondingly.large, a
striking example of Which»i‘s supplied by oneof the larger
’
American =oysters, which -is said? to produce . roo,ooo,ooo
eggs annually'!
'
If a sea urchin or mussel be Watched when
-
spawning, it Will— be seen to discharge a cloudy uid which;
_
.
.
on microsœpical examination, Will be found toxconsist of
incredible numbers
or sperm.
Yet so great are-the
,
dangers to “=Which=‘-theSe unprotected young are exposed
that -‘the= race 'd0esï rio more than hold its own !
-
-
'
'
If '
Search .be
the rocks during the spring,mahÿ=—kinds of‘-'spawu will be found.
Common on the
,
under side of rocks are 'theegg—c‘apsùles of the dog—whelk
'
(Plate 13), whichlook like grains of corn, and are attached
by short stalks,
groups of fty, a hundredor
even more.
Each consists of a tough case, containing a
number of developing embryOS,—amongst which there is the
'
keenest
competition, the weaker' being eaten by" the
.‘
stronger, so that nally only the
or two strongest emerge.
,
The sea slugs provide the mOSt diverse and ornamental
Spawn, covering the rocks with ribbons of jelly, often
beaùtifülly coloùred, in which he embedded the developing
eggs;
The common sea lemons (Plate 17) lay their eggs
in a broad band of pure
always arranged in a triple
coil, some fteen inches long and about one inch wide, the
-
margin'being unusually .wavy. ©ver half a million eggs
‘
maybe laid in a single ribbori, for the young batch outat a .
'
very early: and unpœtected stage.
The spawn of other
‘
sea slugs‘ shows
peculiarities, some consisting of spirals