GENERAL CHARACTERISTICS
7 '
make sloWer'}arogress.
Ÿ Then it gives upthe eort
faster and takes
along the bottom, where it nds
plenty of scopeêfdf its restricted
and Changes 1ts
shape in various-Ways, according to its mode of fe.':—,.Or{èâgï:.i
it manages to
,
compact body—, and iS_thusable
Way through
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water, iri spite of—_ the greater Weight -,béing at the from end
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Various accidents—, from time to nie, hays also helped to
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change the form of
Ibis high”lyPr0bablethât the
earliést:shes had an air—bladder, —fof
that this
*
had an opening intothe gullet or st0mach,as in the Herririg
‘
andf Salmon of the present,
But the restriction and
:consequen‘c “twisting of the digestive ofgans led tb_»the los”s
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ofthisope‘nig, sometimes
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ï
_
air—bladder; The:
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EË
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,shes couldnolOr‘rgeï r1se andfa1{l
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,
,
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layers Ofjwaœf,,l -
doesandwere
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restnct their actrv1t1es
,to ,particiù1‘ar, zenes;—
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ï
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=
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deyelopmg .1ts,broad head
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,'l$tË'ÇËËËÇî'L;_j'j{lè, ,_ ;;
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:moûth;
Œfe”m‘ McIn—
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Ànmteœsüngthmgm,thatt03h)
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‘she’s havèiostth1sOpencwmumcaüontotheairbïadder! ç
Whilst the freshwater shes have retamed1t,wzhhutfew
,
eXceptions.— And monstrousforms,suchaswendmthe
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depths of the ocean, are not to -be- found iri= freshWàter;
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,
The conditions in the sea, especially of pressure and oxygen—_
_'
supply, present greater extremes, which would aec_0unt for
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…,thegœater
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the '} = “. .
accompanylnggmesand :: otherselsewhere i: m thebook
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AfeW
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b£the sh; 5fäf,l— Ï
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Ii1 thecomm0nestshes,Cod,Herrxngetc,themouthÏ-‘Γ
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from81de tos1de às 1ntheformermotherspœntedasm
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