—
240
THE BIOLOGY OF FISHES
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(Fig. 58), they extend over the southern parts of Asia, the
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whole of Africa and parts of America, chiey in South
,
America.
In the latter, indeed, they are represented by
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nearly ten times as many species as eISewhere; but they
are not found in the Australian region. From their
rence in Madagascar and South Europe it would appear
that they have arisen earlier than “the Tertiary period, but
after the southern part of South America had separated
from Africa;
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remarkably similar distribution is shown by the
Cichlidæ, also fresh or brackish—water shes, but widely
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âù _ . ’
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Fm_, 58.——Distribution of the Cyprinodonts. (From Boulenger.)
separatedin structure from theCyprinodonts and probably,
.
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for'that reason,
of a distinct and later origih.._
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_-ofthe species belong toïAfrica;
Mada=
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gascargVeryÎflargejï— iiumb‘érÏliye
in
same” regions”.
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ofAmenca
Species,
,
pIUS,OccurmCeylonand
and they»are hardly;
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distinguishable genericallyÇfrom. Paretroplus, Which occurs Ï
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both agene‘fa; are
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different from all .
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the other
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On the -otheriîhand,
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removed‘ffrom
show— f'quite thé reverse”.
parts
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_ÎaSmania;;Î:New Zealand,-