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  PROCEEDINGS 
  OP 
  THE 
  GEOLOGICAL 
  SOCIETY. 
  

  

  Oolite, 
  which, 
  with 
  the 
  14 
  in 
  the 
  Lias, 
  gives 
  nearly 
  60 
  appearances. 
  

   Pew 
  species 
  have 
  a 
  long 
  range 
  ; 
  three, 
  however, 
  may 
  be 
  named 
  — 
  

   Serpida 
  mtestinalis, 
  from 
  the 
  Great 
  Oolite 
  to 
  the 
  Coral 
  Eag 
  ; 
  

   Serpida 
  tricarinata, 
  from 
  the 
  Puller's 
  Earth, 
  intermittently, 
  to 
  the 
  

   Coral 
  Eag 
  ; 
  and 
  Serpula 
  lacerata, 
  Great 
  Oolite 
  and 
  Coral 
  Eag. 
  The 
  

   remainder 
  are 
  scattered 
  according 
  to 
  their 
  habitat 
  and 
  the 
  shells 
  &c. 
  

   to 
  which 
  they 
  are 
  attached. 
  

  

  Crustacea. 
  — 
  Of 
  the 
  24 
  genera 
  and 
  64 
  species 
  that 
  are 
  known 
  in 
  

   the 
  Jurassic 
  rocks, 
  14 
  genera 
  and 
  42 
  species 
  occur 
  in 
  the 
  Lias 
  — 
  

   12 
  genera 
  in 
  the 
  Lower 
  Lias, 
  1 
  in 
  the 
  Middle, 
  and 
  6 
  in 
  the 
  Upper 
  ; 
  

   and, 
  respectively, 
  33, 
  1, 
  and 
  12 
  species. 
  No 
  Liassic 
  species 
  passes 
  the 
  

   limits 
  of 
  the 
  Upper 
  Lias 
  : 
  13 
  of 
  the 
  33 
  Lower-Lias 
  species 
  belong 
  to 
  

   the 
  Ostracoda 
  (Bairdia 
  4 
  species, 
  Cytherella 
  1, 
  Gythere 
  7, 
  Polycope 
  1); 
  

   these 
  are 
  of 
  little 
  value 
  in 
  classification. 
  No 
  species 
  is 
  common 
  to 
  both 
  

   the 
  Lower 
  and 
  Middle 
  Lias 
  ; 
  and 
  3 
  species 
  (JSryon 
  antiquus, 
  Glyphea 
  

   Heerii, 
  and 
  Palinurus 
  longipes) 
  are 
  Lower 
  and 
  Upper 
  Lias 
  only, 
  not 
  

   having 
  as 
  yet 
  been 
  found 
  in 
  the 
  intermediate 
  or 
  Middle 
  Lias. 
  The 
  

   chief 
  genera 
  arc 
  Eryon, 
  Eryma, 
  and 
  Glyphea. 
  Eryon 
  is 
  entirely 
  

   confined 
  to 
  the 
  Lias 
  (5 
  species 
  in 
  the 
  Lower 
  and 
  3 
  in 
  the 
  Upper). 
  

   Eryma 
  also, 
  with 
  one 
  exception 
  (E. 
  Babeaiu), 
  is 
  confined 
  to 
  the 
  

   Lias, 
  3 
  species 
  being 
  in 
  the 
  Upper 
  division. 
  Glyphea, 
  with 
  11 
  species, 
  

   is 
  represented 
  by 
  5 
  Lower-Lias, 
  1 
  Upper-Lias, 
  and 
  1 
  Great-Oolite 
  

   species, 
  3 
  Cornbrash, 
  2 
  in 
  the 
  Kellaways 
  Eock, 
  2 
  in 
  the 
  Oxford 
  

   Clay, 
  2 
  in 
  the 
  Coral 
  Eag, 
  and 
  2 
  in 
  the 
  Kimmeridge 
  Clay, 
  making 
  

   18 
  appearances 
  through 
  the 
  same 
  species 
  occurring 
  in 
  different 
  

   horizons. 
  Pour 
  genera 
  (zEger, 
  Scapheus, 
  Pseudoglyphea, 
  and 
  Hefrigd) 
  

   have 
  only 
  1 
  species 
  each. 
  The 
  3 
  former 
  are, 
  however, 
  Lower 
  Lias, 
  

   and 
  the 
  last 
  named 
  is 
  an 
  Upper-Lias 
  genus. 
  It 
  may 
  be 
  said 
  that 
  

   not 
  a 
  single 
  species 
  occurs 
  in 
  the 
  Middle 
  Lias, 
  for 
  only 
  an 
  Ostracod 
  

   {Cytherella 
  crepidula) 
  seems 
  to 
  enjoy 
  the 
  privilege 
  of 
  being 
  alone 
  in 
  

   that 
  division. 
  Nine 
  of 
  the 
  12 
  species 
  that 
  occur 
  in 
  the 
  Upper 
  Lias 
  

   are 
  peculiar 
  to 
  it 
  ; 
  owing 
  to 
  their 
  value 
  as 
  illustrating 
  the 
  Upper 
  

   Lias 
  and 
  not 
  ranging 
  to 
  higher 
  horizons, 
  I 
  name 
  them: 
  — 
  Eryon 
  

   Hartmanni, 
  E. 
  Moorei, 
  Eryma 
  elegans, 
  E. 
  fusiformis, 
  E. 
  Greppini, 
  

   Hefriga 
  Frischmannii, 
  Palinurina 
  pygmwa, 
  Penaius 
  latipes, 
  and 
  

   P. 
  Sharpei. 
  

  

  Bryozoa. 
  — 
  Only 
  3 
  genera 
  and 
  6 
  species 
  are 
  known 
  in 
  this 
  division 
  

   of 
  the 
  Jurassic 
  rocks, 
  although 
  19 
  genera 
  and 
  51 
  species 
  range 
  

   through 
  the 
  entire 
  series. 
  The 
  Great 
  Oolite 
  yields 
  by 
  far 
  the 
  

   greatest 
  number 
  of 
  species 
  (31) 
  ; 
  the 
  Inferior 
  Oolite, 
  next 
  in 
  value, 
  

   has 
  yielded 
  7 
  genera 
  and 
  17 
  species. 
  The 
  Lower- 
  Lias 
  genera 
  are 
  

   Berenicea, 
  Neuropora, 
  and 
  Spiropora, 
  with 
  4 
  species. 
  Spiropora 
  

   liassica 
  is 
  a 
  Middle-Lias 
  form, 
  and 
  the 
  only 
  species 
  occurring 
  in 
  that 
  

   division. 
  Berenicea 
  Archiaci 
  is 
  the 
  only 
  species 
  that 
  has 
  yet 
  appeared 
  

   in 
  the 
  Upper 
  Lias. 
  No 
  form 
  passes 
  to 
  the 
  Inferior 
  Oolite, 
  although 
  

   17 
  species 
  are 
  recorded 
  from 
  that 
  horizon. 
  The 
  single 
  form 
  in 
  the 
  

   Fuller's 
  Earth 
  is 
  Terebellaria 
  ramosissima. 
  The 
  higher 
  beds 
  will 
  be 
  

   described 
  in 
  their 
  turn. 
  

  

  Brachiopoda. 
  — 
  Lower 
  Lias. 
  The 
  Liassic 
  Brachiopoda 
  number 
  16 
  

   genera, 
  with 
  124 
  species, 
  10 
  genera 
  and 
  36 
  species 
  of 
  which 
  occur 
  in 
  

  

  