'
THE GENEALOGY 0EFISHES
207
’
not covered with the calcied armour-of the Ganoids1or
Antiarchians.
There is also Lausanias from the same
deposits, regarding which only…thescutes and ,a.
presumed heterocercal tail are
…Lastly,’
some indetermihable remains, with little
'
have been found in the Cambrian layers;ofCânada.
In these forms we are obviously
liinitS
of
sh series.
The calcication
thin, or
_
absent._, There is no
nothing
limb, -and all We can say
that these müstehave been
muscular b0dies
to swini
_thrOugh the TWaœr
a
,
denite direction.
_
were not
forms
,
GànoidS
f
=
,
Th1$1sperhaps a'suicient indication and de$cription of
,
'
Ÿ
,
‘u…_ __ .;
_
,
,
:
-‘\\\\\\ \\\\\.
-
°
—
,
thidt1Thplg fmmnugm1ar
fofmsl of
D1pn01arecommonmle
Devonian
bùt sorhé rmlhonsofyeaisearherthanthe
…
'Î;
rst probable shark We have these SiIUrian
;}
brian forms which are _neither Ganoid nor Dipnôah nor
CÏDSS€S. between these and Tele03ts_. , When we sàÿ__that
,
theywerepelagrcfœms, the nearest comparison lies with the
—,
Turningnow
development
fif,
ntutm1fmth mp1…hmp1
"
complex; nthyf ar … w11d1pdvml
if