DISTRIBUTION IN TIME“ AND. SPACE -225
oXus and the Tunicates, belong mainly to the coastal region
within or just beyond the inuence of the tides.
,
'
,
Again, it is also believed that the centre, from which at
any rate the modern shes started, lay somewhere along
the eastern coasts of the Indian Ocean
variety of species occurs. Of the simple form ,Amphioxus,
'
—
for example, one species is found in the Atlantic
'
,
well as in Ceylon, another on the Pacic coast of Arnerica;_«
,
and one more in South Africa, but at least three Species Occur‘
'
in the Indian Archipelago,
'
Of
neighbouring form "
Asymmetron six species occur.in the Indian Archipelago, ;
Australia,and NewZealand, but none
in theAtlantic
(Herdman, 1904).
,
'
'
'
«,
'
I'
'
But wemust get away 00mpletely for the moment from,
,
theSe modern, conditions.
_
We donot know where the poles
were
in the ancient periods_, nor the equator ; that ”the Earth;
’
,
has wobbled a,great deal we ,cantake for granted, andthe— ,'
—
great wealth '
of the ;Indo—Pacicin recent times has ;ÏalmoSt:
_
certainly
fact that it, has-Iain
'
'«
under a . trOpiea‘l chmate
'
,_
million yearsthetorr1dzonemaywellhave ïb€e:
t1mesto
,
_.
cend1tlonsfor theappearanceofshesmayhaV€ been
.
,
morefavourableletussay 1nthe north Certamû1s
,
that thé ,earestzremains;—of;—èhèèïhàvèg“;beerir,gi found1nthe
_,
:“
northern heihisphe‘reî andfar-aaway from ,anîy seaofthe ;i:
present time. The shes may have
'
"
'
therefore, not in salt and nowhere near the Indian
'
'
—
Ferhaps a compromise would come nearest to the truth;
like the
the earliest shes may have been, common;
:,”
fresh water and» probably = arose on
boundarybetween the two and near the shore,
',
“
supply of food_jand oxygen,
'
,
Α:__Î';
_
:
have
_
also a doublenature
'The ïheavin
‘
'
;
water, buttheArthr9duansandAcan‘îh0dldæWeæP10bably ' '
,
marine.
Sièe*
found in thenelghboufh00d0f16g10n8 wher
=
_
.
'
:
,
;
o:
' ,
‘
-
!
oXus and the Tunicates, belong mainly to the coastal region
within or just beyond the inuence of the tides.
,
'
,
Again, it is also believed that the centre, from which at
any rate the modern shes started, lay somewhere along
the eastern coasts of the Indian Ocean
variety of species occurs. Of the simple form ,Amphioxus,
'
—
for example, one species is found in the Atlantic
'
,
well as in Ceylon, another on the Pacic coast of Arnerica;_«
,
and one more in South Africa, but at least three Species Occur‘
'
in the Indian Archipelago,
'
Of
neighbouring form "
Asymmetron six species occur.in the Indian Archipelago, ;
Australia,and NewZealand, but none
in theAtlantic
(Herdman, 1904).
,
'
'
'
«,
'
I'
'
But wemust get away 00mpletely for the moment from,
,
theSe modern, conditions.
_
We donot know where the poles
were
in the ancient periods_, nor the equator ; that ”the Earth;
’
,
has wobbled a,great deal we ,cantake for granted, andthe— ,'
—
great wealth '
of the ;Indo—Pacicin recent times has ;ÏalmoSt:
_
certainly
fact that it, has-Iain
'
'«
under a . trOpiea‘l chmate
'
,_
million yearsthetorr1dzonemaywellhave ïb€e:
t1mesto
,
_.
cend1tlonsfor theappearanceofshesmayhaV€ been
.
,
morefavourableletussay 1nthe north Certamû1s
,
that thé ,earestzremains;—of;—èhèèïhàvèg“;beerir,gi found1nthe
_,
:“
northern heihisphe‘reî andfar-aaway from ,anîy seaofthe ;i:
present time. The shes may have
'
"
'
therefore, not in salt and nowhere near the Indian
'
'
—
Ferhaps a compromise would come nearest to the truth;
like the
the earliest shes may have been, common;
:,”
fresh water and» probably = arose on
boundarybetween the two and near the shore,
',
“
supply of food_jand oxygen,
'
,
Α:__Î';
_
:
have
_
also a doublenature
'The ïheavin
‘
'
;
water, buttheArthr9duansandAcan‘îh0dldæWeæP10bably ' '
,
marine.
Sièe*
found in thenelghboufh00d0f16g10n8 wher
=
_
.
'
:
,
;
o:
' ,
‘
-
!