The  original  or  type  specimen  of  Trogontherium  has  been  described
and  figured  by  Dr.  C.  Kouillier,  in  his  "  Jubilaeum  Fischeri,"  p.  35,
Tab.  5.     It  was  discovered  at  Tagtmrog,  Sea  of  Azoff.
In  the  "  Quarantine  Kavine,"  near  Odessa,  in  a  yellow  argillaceous
deposit,  beneath  a  thick  stratum  of  "  Calcaire  d'Ossessa,"  the  '*  Old
Caspian  Deposit "  of  Murchison,  various  mammalian  fossils^  wore

1  Catal.  of  OstcoL  in  Surgeon's  College,  4to,  No.  2193,  p.  392.
'  Elcphas,  Rhinoceros,  Ceryns,  Equus,  Hyaena,  Ursua.
56         Dakyns — Geological  Notes  on  the  Lake  District.
diJMiovered  in  1846,  among  which  were  *'  parties  separees  de  sqnelette
(not  specified)  d'un  animal  resemblant  an  Castor  {Trog<mtherium).^*^

DESCEIPTION  OF  THE  DOUBLE  PLATE  IIL
Trogonthirium  Ouvuri,
Fig.  L  Front  yiew  of  left  femur.
2.  Back  view  of  ib,'

3.  Distal  articular  surface,  or  cond^rles,  ih,

4.  Outer  side  view  of  femur  and  tibia  (the  latter  drawn  without  rerening.)
6.  Front  view  of  right  tibia  and  confluent  part  of  fibula.
6.  Back  view  of  t^.
7.  Distal  articular  end  of  ib.
8.  Calcaneum.
9.  „         of  the  recent  Caitmrjibtr  (for  comparison).
All  the  figures  are  of  the  natural  size.
n. ^NOTES   ON   THE   GeOLOGT   OF   THE   LaKE  .  DiSTBICT.
*"     By  J.  R.  Dakyns,  of  the  Geological  Survey.
I  WISH,  through  the  medium  of  your  pages,  to  call  the  attention
of  Geologists  to  an  important  point  in  the  Geology  of   the
English  Lake  District

I  made  a  short  tour  in  that  district  early  in  December  of  last
year,  when  I  thought  I  discovered  evidence  of  an  "  unconformity  "
between  the  beds  of  the  Greenslates  and  Porphyry  series  and  the
Skiddaw  Slates.
