210
THE B‘IOLOGY‘ OF, Frsræs
_
and the fos‘sil was variously placed among;
thedifferent known orders of shes and even outside
A considerable number of speciniens of this form have
'
been discovered and the followirigsummary may be” given
of the principal characters Month terminal:but structuré
Uncertain, the supposéd cirri may have been crushed
Ï_- {
'
—remnants of the palatines and maxillaries ; the skull Very
"
—
br0ad posteriorly, ..narrower anteriorly, and without
.
the ,armoured‘shes ;” no
sign . of
'
4
'
may
been present,} butthéiï
ïpreSence of) any__ other ns is
CaudalfregiQn—_
,
Ï'diphycercal or'turnedupWards
cclumn'c0nsisng
Centra;
,
__
;
Dean;th
mostthorough examination
'
ffrc>m time, »1
a
-
: mghtbbbth(Hly>blgtrn
,
primitive '—Cläss of .Vertebrate.ï Onone1mportantpomt,
"
Dean
_"fïthaïçgthe vertebræ of Palæospondylus Were,“ apparenyofa
-
type—‘UnknoWnamong recent shes.” As a matter of fact,
»
1
thé- safne as the brous rings or tubes
the 1aai Clupeids of the same size as the*fossil specrmens,
naî€ly,froin about 20 to 50 mm., and-.:1si—milar.
=
io'ccçur in othehTeleost‘s_,.hutnevermtheElasmobramhs ? f:£
D1pnmorGavmds
Theverteb1æ0fPaïæ0$Pondusnumberedffomî‘rô %
andBashfordBeanThesearewellknown proportions;
BäsÏhford Dean
;. ,_‘:jpmpèr *ôrig3 ‘;
the tympàijçÿi
bu1111yp…dnmp…
the pecuharpostorbltal Process Of thefrontalbonelsalso