494 
MR.  S.  S.  BECKMAN  ON  THE  BAJOCIAN  [NOV.  1893, 
Upper  Part. — Sonninia  'patella  (Waag.),  S.  propinquans,  Bayle,  and  allied 
forms.  Species  of  the  Sonninia  Zurcheri- group.  ‘  Stephan l  Sauzei  (d’Orb.), 
Oppelia  aff.  prceradiata  (Douv.),  and  other  species.  Stephanoceras  sp. 
(cf.  Ammonites  Humphriesianus  macer ,  Quenstedt).1  ‘  Witchellia  Icevius- 
cula Strigoceras  sp.,  Acanthothyris  paucispina,  B.  &  W.,  Terehratula  ventri- 
cosa ,’  Zieten.  The  chief  horizon  for  gasteropoda  (mostly  Pleurotomaria } 
is  about  3  to  4  inches  from  the  top  of  this  bed. 
Middle  Part. — ‘  Sonninia  ’  pinguis,  S.  gingensis,  S.  gracililohata,  Quenstedt,2 
Witchellia  sp.,  Sphcsroceras  aff.  Manseli,  S.  Buckm.,  Sph.  Brocchi,  Sph. 
Sauzei ,  and  a  thinner  form.  Lima  prohoscidea  very  abundant.  Various 
species  of  ‘  Sonninia .’ 
Lower  Part. — £  Stephan'  aff.  Sauzei,  Sphcsr.  Brocchi,  1  Sonninia'  Stephani, 
S.  rudis,3  and  allied  forms ;  Sonninia  fissilobata  (Waag.)  and  allied  forms ; 
S.  arenata  (Quenst.)  ;  several  species  of  spinous  Sonninia  allied  to 
‘  Sowerbyi  several  species  of  ‘  mammillate  ’ 4  Sonninice  of  the  Ammo¬ 
nites  mesacanthus- type,  but  not  that  species  itsel  f ;  Witchellia  Sutneri  and 
allied  species. 
The  predominance  of  the  Sonninia  Jissilobata- type  of  Ammonite  in 
the  lower  part  of  the  bed  is  a  feature  sure  to  attract  attention. 
When  the  quarry  was  worked  several  years  ago  (about  1875)  these 
fossils  received  the  appellation  of  the  4  Combe  Ammonites.’  In  the 
middle  of  the  bed  the  most  striking  feature  is  the  large  number  of 
Lima  prohoscidea  or  pectiniformis — at  any  rate  a  species  of  Cteno- 
streon — which  usually  leave  their  shells  with  too  great  readiness. 
Towards  the  top  of  the  bed  the  Pleurotomarice ,  especially  those  of 
the  granulata- type,  the  numerous  examples  of  Acanthothyris  pauci¬ 
spina  ,  and  the  presence  of  true  Sonninice — compressed,  high-keeled 
species  of  the pi'opinquans-type,  very  different  from  the  small-keeled, 
stouter  species  of  the  Jissilobata-series — are  the  most  striking 
features. 
This  section,  placed  on  the  top  of  that  of  Marston  Eoad  Quarry 
— which  is  only  about  5  furlongs  distant, — makes  the  sequence 
apparently  complete ;  yet  for  many  reasons  I  anticipate  that  some 
2  or  3  feet  of  strata  are  wanting  between  the  top  of  Marston  Eoad 
and  the  base  of  Sandford  Lane.  These  strata  would  contain 
Lioceras  concavum  and  allies.  Beds  9  and  10  can  certainly  be 
correlated  with  the  strata  on  Pointington  and  Horethorne  Downs. 
Those  beds  may  be  a  very  considerable  expansion  of  these  horizons 
only,  or  they  may  be  equivalent  to  Beds  8—12  inclusive.  Above 
Bed  8  is  the  4  Fossil  Bed  ’  of  Sandford  Lane — at  a  totally  different 
horizon  from  that  of  Bradford  or  Halfway  House,  and  yielding  a 
totally  different  fauna.  Any  equivalent  of  the  lower  part  of  this 
bed  has  been  wanting  from  the  sections  so  far  given,  and  very 
few  localities  in  this  country  show  the  horizon  at  all.  Broadly 
speaking,  it  may  be  said  that  no  other  locality  in  England  yields 
the  same  fauna  as  the  lower  part  of  this  bed.  Dundry  is  the 
1  Two  forms,  one  much  more  spinous  than  the  other,  are  shown  by  Quen¬ 
stedt  (‘  Amm.  d.  schwabischen  Jura  ’)  under  this  name.  Both  occur  here. 
2  Ammonites  Sowerbyi  gracililobatus,  Quenstedt,  ‘Amm.  d.  schwab.  Jura,’ 
pi.  lxii.  fig.  2. 
3  Ammonites  Sowerbyi  rudis,  ‘  Amm.  d.  schwab.  Jura,’  pi.  lxi.  fig.  12. 
4  This  term  will  be  easily  understood  by  those  who  know  the  adult  of 
Sonninia  mesacanthus ,  with  its  small  pimples  as  shown  in  Waagen’s  work. 
