File:The Quarterly Journal Of The Geological Society Of London (13960031433).jpg
2. On ^Remains and Affinities of five Genera of Mesozoic R,ep-
tiles. By R. Lydekker, Esq., B.A., E.G.S. (Head November 21,
188S.)
.Plate II..
Introductory.
The following communication treats of certain remains referred to
four species of English Mesozoic Reptiles, some of which were first
described or named by Professor H. G. Seeley, and also includes
a discussion as to the affinities of a fifth form. The substance of
that portion of the paper relating to Peloneustes pTiilarchus was pre-
viously brought under the notice of the Society at the Meeting held
on May 23rd as a separate communication, entitled " On the Skeleton
of a Sauropterygian from the Oxford Clay near Bedford "
- ,
but,
on
account
of
a
change
of
view
on
the
part
of
the
Author,
it
was
con-
sidered
advisable
that
it
should
be
again
presented
in
a
revised
form.
I.
Vertebra
of
an
Ornithopobous
Dinosaur
from
the
Cambridge
Greensand.
On
page
621
of
a
memoir
on
the
remains
of
Dinosaurs
from
the
Cambridge
Greensand,
published
in
the
35th
volume
of
the
Society's
'
Journal,'
Professor
Seeley
applied
the
name
Si/ngonosaurus
macro-
cercus
to
a
series
of
nineteen
vertebras
from
the
cervical,
dorsal,
sacral,
and
caudal
regions,
which
were
said
to
be
associated,
and
indicate
a
medium-sized
species.
At
the
conclusion
of
the
descrip-
tion
of
these
vertebras
mention
is
also
made
of
certain
dermal
scutes,
which
it
was
suggested
might
also
be
associated.
I
have
no
intention
of
entering
into
the
question
whether
the
alleged
associa-
tion
of
all
these
remains
is
absolutely
certain,
and
I
shall
accord-
ingly
confine
my
remarks
to
the
one
cervical
and
eight
dorsal
vertebras,
which,
as
being
the
first
described
(although
not
figured),
may,
I
presume,
be
regarded
as
the
types.
All
the
dorsals
are
amphiccelous,
and
characterized
by
their
compressed
centra
to
which
the
arches
are
firmly
united,
the
absence
of
rib-facets
on
the
arches,
and
the
height
of
the
neural
canal.
In
the
four
anterior
dorsals
the
centrum
is
comparatively
short,
with
triangular
terminal
faces
and
a
sharp
hasmal
ridge
while
in
the
four
later
ones
the
centrum
is
longer,
the
haemal
ridge
disappears
more
or
less
completely,
being
represented
by
a
tubercle
at
either
end
f
,
and
the
terminal
faces
are
less
triangular.
In
the
anterior
dorsals
the
length
of
the
centrum
varies
from
1*5
to
1*7
inch
while
in
the
first
of
the
four
later
ones
this
length
is
1*75,
and
the
height
from
the
base
of
the
centrum
to
the
summit
of
the
neural
platform
2"
5
inches.
Prof.
Seeley
makes
no
attempt
to
determine
the
serial
position
of
Proc.
Geol.
Soc.
1888,
p.
89.
t
I
take
the
character
from
page
621
of
Prof.
Seeley's
memoir
there
is
some
discrepancy
with
this
on
p.
- The Quarterly journal of the Geological Society of London. v. 45 (1889).
- Geology
- Periodicals
- Smithsonian Libraries
- bhl:page 36939782
- dc:identifier https://www.biodiversitylibrary.org/page/36939782
- smithsonian libraries
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