﻿208 
  PROCEEDINGS 
  OF 
  THE 
  GEOLOGICAL 
  SOCIETY. 
  

  

  The 
  special 
  or 
  restricted 
  species 
  are 
  Alaria 
  arsinoe, 
  Oerithium 
  abbre- 
  

   viatum, 
  G. 
  crebrum, 
  Chemnitzia 
  lineata, 
  Patella 
  graphica, 
  Pleuroto- 
  

   maria 
  arenosa, 
  P. 
  guttata, 
  and 
  P. 
  striata. 
  None 
  of 
  these 
  occur 
  out 
  

   of 
  the 
  Kellaways 
  Rock 
  ; 
  and 
  most 
  of 
  them 
  are 
  Yorkshire 
  species. 
  

   4 
  species 
  first 
  appear 
  in 
  the 
  Kellaways 
  and 
  pass 
  to 
  higher 
  horizons. 
  

   They 
  are 
  Pleurotomaria 
  depressa, 
  Alaria 
  armigera, 
  Actceon 
  retusus, 
  

   and 
  Dentalium 
  annidatum. 
  Thus 
  the 
  8 
  restricted 
  forms 
  and 
  these 
  

   4 
  which 
  first 
  appear, 
  or 
  12 
  species, 
  must 
  be 
  considered 
  as 
  con- 
  

   stituting 
  the 
  typical 
  Gasteropoda 
  of 
  the 
  formation. 
  Only 
  5 
  genera 
  

   and 
  (i 
  species 
  out 
  of 
  the 
  }§ 
  unite 
  the 
  Lower 
  and 
  Middle 
  Oolites. 
  

   They 
  are 
  : 
  — 
  Alaria 
  bispinosa, 
  A. 
  trifida, 
  Dentalium 
  entaloideum-, 
  

   Amberlya 
  ornata, 
  Nation 
  punctura, 
  and 
  Pleurotomaria 
  granulata. 
  

   I 
  pass 
  to 
  the 
  Oxford 
  Clay, 
  and 
  f 
  to 
  the 
  Oorallian 
  beds. 
  

  

  Cephalopoda. 
  Ammonites. 
  — 
  No 
  less 
  than 
  41 
  species 
  of 
  Ammonites 
  

   suddenly 
  appear 
  in 
  the 
  Callovian 
  beds. 
  33 
  of 
  these 
  occur 
  in 
  the 
  

   Yorkshire 
  deposits. 
  Our 
  knowledge 
  of 
  these 
  is 
  largely 
  due 
  to 
  the 
  re- 
  

   searches 
  of 
  Professor 
  Phillips 
  and 
  the 
  late 
  Mr. 
  Leckenby*. 
  20 
  of 
  

   the 
  41 
  species 
  pass 
  to 
  the 
  Oxford 
  Clay 
  and 
  4 
  to 
  the 
  Corallian 
  beds. 
  

   The 
  17 
  species 
  actually 
  confined 
  to 
  the 
  Kellaways 
  group 
  are 
  Amm. 
  

   alter 
  nans, 
  Amm. 
  auritulus, 
  Amm. 
  Bakerice, 
  Amm. 
  Baugieri, 
  Amm. 
  

   convolutus, 
  Amm. 
  Eugenii, 
  Amm. 
  jiexicostatus, 
  Amm. 
  jluctuosus, 
  

   Amm.goliathus, 
  Amm. 
  Henrici, 
  Amm. 
  Lalandianus, 
  Amm. 
  Lonsdalei, 
  

   Amm. 
  oculatus, 
  Amm. 
  planula, 
  Amm. 
  tatricus, 
  Amm. 
  raricostatus, 
  

   and 
  Amm. 
  Vernoni. 
  Only 
  1 
  species 
  {Amm. 
  macrocephalus) 
  passes 
  

   from 
  the 
  Cornbrash 
  to 
  the 
  Kellaways. 
  The 
  4 
  species 
  that 
  pass 
  to 
  

   the 
  Corallian 
  beds 
  are 
  Amm. 
  alligatus, 
  Amm. 
  Gulielmi, 
  Amm. 
  perar- 
  

   matus, 
  and 
  Amm. 
  placenta. 
  They 
  range 
  no 
  higher. 
  Scarborough, 
  

   IiedclifF, 
  Hackness, 
  and 
  Gristhorpe 
  are 
  the 
  chief 
  localities 
  from 
  which 
  

   the 
  Kellaways 
  Ammonites 
  have 
  been 
  obtained. 
  

  

  Ancyloceras. 
  — 
  Only 
  2 
  Jurassic 
  species 
  of 
  Ancyloceras 
  are 
  known 
  — 
  

   A. 
  annulatum, 
  in 
  the 
  Inferior 
  Oolite, 
  and 
  A. 
  calloviense, 
  from 
  the 
  

   Kellaways 
  Rock 
  of 
  Wiltshire. 
  

  

  Nautili. 
  — 
  Nautilus 
  calloviensis 
  and 
  N. 
  Jieocagonus 
  are 
  the 
  only 
  

   species 
  yet 
  known. 
  N. 
  Jieocagonus 
  occurs 
  in 
  the 
  Cornbrash 
  (?), 
  

   Kellaways, 
  and 
  Corallian 
  beds. 
  

  

  Belemnitidce. 
  — 
  The 
  Dibranchiata 
  are 
  equally 
  poor 
  in 
  species. 
  We 
  

   only 
  know 
  3 
  species, 
  viz. 
  Belemnites 
  Owcnii, 
  B. 
  hastatus, 
  and 
  B. 
  tor- 
  

   natilis. 
  

  

  Pisces. 
  — 
  Teeth 
  of 
  StropJiodus 
  radiato-punctatus 
  occasionally 
  occur; 
  

   no 
  other 
  forms 
  are 
  known. 
  

  

  Reptilia. 
  — 
  None 
  known. 
  

  

  Mammalia. 
  — 
  None 
  known. 
  

  

  * 
  Quart. 
  Journ. 
  Q-eol. 
  Soc. 
  vol. 
  xv. 
  

  

  