Vol.  49.] 
A  NEW  CARNIVOROUS  DINOSAUR. 
287 
of  Scelidosaurian  affinities,  but  the  absence  of  a  premandibular 
element  in  the  lower  jaw  forming  the  subject  of  this  paper  differ¬ 
entiates  that  specimen  from  all  the  Iguanodonts,  Scelidosaurians, 
and  Stegosaurians  in  which  the  complete  mandible  is  known  ;  and, 
after  all,  the  structure  of  the  teeth  is  so  little  removed  from  the 
Megalosaurian  type  as  not  to  forbid  the  reference  of  both  specimens 
to  the  carnivorous  group  of  Dinosaurs. — May  5th,  1893.] 
EXPLANATION  OF  PLATE  SI. 
Figs.  1,  1  a.  Outer  and  oral  aspects  of  the  imperfect  left  dentary  bone  of 
Sarcolestes  Leedsi,  from  the  Oxford  Clay  of  Peterborough.  ^  nat. 
size.  s= symphysis. 
Fig.  1  b.  A  single  tooth  of  the  former,  f  nat.  size. 
Figs.  2,  2  a.  Outer  aspect  and  quadratic  cavity  of  the  hinder  region  of  the  same 
jaw.  ^  nat.  size. 
O  m  o 
Fig.  3.  A  single  tooth  of  Priodontognathus  Phillipsi,  y  nat.  size,  shown 
for  purposes  of  comparison.  Specimen  in  the  Woodwardian 
Museum,  Cambridge. 
Discussion. 
The  President  was  glad  to  see  that  the  Author  had  been  again 
able  to  make  use  of  the  Leeds  Collection,  which  was  invaluable. 
Prof.  Seeley  said  that  he  had  only  seen  the  specimen  for  a  minute 
or  two  since  entering  the  room,  and  was  not  prepared  to  express  a  final 
opinion  upon  its  relations.  The  mode  of  succession  of  the  teeth,  and, 
so  far  as  he  had  seen,  the  forms  of  the  teeth,  reminded  him  of  Pri¬ 
odontognathus ,  which  the  Society  had  figured  in  1875.  He  had 
founded  that  genus  on  a  maxillary  bone,  which  therefore  could  not 
be  closely  compared  with  this  mandible.  The  form  of  the  dentary 
bone  recalled  Cretaceous  types,  and  among  others  a  bone  from  Gosau, 
which  might  belong  to  Gratoeomus ,  figured  in  the  Society’s  Journal 
for  1881.  He  did  not  recognize  characters  which  would  approximate 
it  to  Megalosaurus,  Anchisaurus ,  or  Thecoclontosaurus ;  and  he  should 
not  expect  a  Triassic  type  to  occur  in  the  Oxford  Clay.  The  specimen 
might  possibly  prove  to  be  a  jaw  of  one  of  the  Oxford  Clay  saurians 
already  known  from  near  Peterborough ;  and,  rather  than  place  it  in 
a  new  genus,  he  would  have  preferred  to  group  it  provisionally  with 
the  remains  which  have  been  affiliated  to  Omosaurus.  Some  time  ago, 
Mr.  Leeds  had  submitted  to  him  some  long,  terminal  caudal  vertebrae, 
which  might  be  a  part  of  the  same  animal  as  the  jaw.  It  was  to  be 
hoped  that  other  remains  between  these  extremities  may  be  found. 
The  Author  briefly  replied. 
