﻿224 
  

  

  PROCEEDINGS 
  OF 
  THE 
  GEOLOGICAL 
  SOCIETY. 
  

  

  

  and 
  H. 
  Davidsoni 
  are 
  the 
  only 
  3 
  species 
  known 
  in 
  the 
  Portlandian 
  

   beds. 
  

  

  Ankelida. 
  — 
  Scrjmla 
  is 
  the 
  only 
  genus 
  known, 
  and 
  is 
  represented 
  

   by 
  4 
  species 
  — 
  S. 
  gordialis, 
  S. 
  quinquangularis, 
  S. 
  triserrata, 
  and 
  

   S. 
  variabilis. 
  The 
  first-named 
  3 
  species 
  are 
  Portland 
  only. 
  S. 
  

   variabilis 
  is 
  also 
  Kimmeridgian. 
  

  

  Cetjstacea. 
  — 
  The 
  Entomostraca 
  only 
  are 
  represented, 
  and 
  these 
  

   by 
  Cythereis 
  interrupta 
  and 
  O. 
  Lonsdaleiana. 
  

  

  Brxozoa. 
  — 
  ISTone 
  known. 
  

  

  Erachiopoda. 
  — 
  Three 
  species 
  of 
  three 
  genera, 
  namely 
  Waldheimia 
  

   boloniensis, 
  Terebratula 
  rex, 
  and 
  JRhynchonella, 
  sp. 
  

  

  The 
  accompanying 
  Table 
  (XLI.) 
  exhibits 
  the 
  numerical 
  value 
  

   and 
  distribution 
  of 
  the 
  whole 
  of 
  the 
  Jurassic 
  Brachiopoda 
  and 
  the 
  

   total 
  number 
  of 
  appearances 
  of 
  the 
  species 
  in 
  each 
  genus. 
  

  

  Table 
  XLI. 
  — 
  Tlie 
  Numerical 
  Distribution 
  of 
  the 
  Jurassic 
  

   Brachiopoda. 
  

  

  

  • 
  3 
  i 
  

  

  .£ 
  o 
  

   S 
  u 
  

  

  

  

  

  

  

  

  

  

  M 
  

  

  

  

  c? 
  

  

  

  CO 
  

  

  CD 
  

   O 
  

  

  | 
  

   CD 
  

  

  Genera. 
  

  

  co 
  m 
  

  

  o 
  g 
  

  

  cc 
  

  

  CO 
  

  

  © 
  

  

  fs 
  

  

  m 
  

  

  t3 
  

  

  o 
  

  

  O 
  

  

  00 
  

  

  6 
  

   O 
  

  

  es 
  

  

  CD 
  

  

  03 
  

  

  — 
  - 
  

   cu 
  

  

  d 
  

  

  O 
  

   O 
  

  

  CO 
  

  

  r 
  

  

  O 
  

  

  c2 
  

  

  1 
  

  

  Q 
  

  

  CD 
  

  

  T3 
  

  

  a 
  

  

  CS 
  

  

  *3 
  

  

  

  * 
  

  

  O 
  

  

  9 
  

  

  £ 
  

  

  

  3 
  

   ft 
  

  

  

  £ 
  

  

  o 
  

   O 
  

  

  

  M 
  

  

  O 
  

  

  o 
  

  

  W 
  

  

  o 
  

   P4 
  

  

  O 
  

   EH 
  

  

  1. 
  Terebratula 
  ... 
  

  

  67 
  

  

  4 
  

  

  10 
  3 
  

  

  31 
  

  

  5 
  

  

  7 
  

  

  4 
  

  

  5 
  

  

  3 
  

  

  2 
  

  

  7 
  

  

  o 
  

  

  1 
  

  

  84 
  

  

  2. 
  Waldheimia 
  ... 
  

  

  44 
  

  

  3 
  

  

  13 
  3 
  

  

  13 
  

  

  4 
  

  

  4 
  

  

  o 
  

  

  o 
  

  

  8 
  

  

  2 
  

  

  3 
  

  

  6 
  

  

  

  1 
  

  

  63 
  

  

  3. 
  Terebratulina... 
  

  

  4 
  

  

  ... 
  

  

  1 
  1 
  

  

  2 
  

  

  

  1 
  

  

  

  

  

  

  

  

  

  5 
  

  

  4. 
  Thecidium 
  

  

  15 
  

  

  5 
  

  

  4 
  4 
  

  

  9 
  

  

  1 
  

  

  1 
  

  

  

  

  

  

  2 
  

  

  

  

  26 
  

  

  5. 
  Zelania 
  

  

  6 
  

   5 
  

  

  1 
  

  

  ... 
  1 
  

   1 
  ... 
  

  

  3 
  

  

  

  1 
  

   4 
  

  

  

  

  

  

  1 
  

  

  

  

  7 
  

   5 
  

  

  6. 
  Terebratella 
  ... 
  

  

  7. 
  Suessia 
  

  

  1 
  

  

  

  1 
  

  

  

  

  

  

  

  

  

  

  

  

  

  1 
  

  

  8. 
  Spirif'erina 
  

  

  18 
  

  

  5 
  

  

  12 
  

  

  5 
  

  

  3 
  

  

  

  

  

  

  

  

  

  

  

  25 
  

  

  9. 
  Rhynchonella... 
  

  

  64 
  

  

  9 
  

  

  19 
  

  

  10 
  

  

  23 
  

  

  4 
  

  

  o 
  

  

  3 
  

  

  5 
  

  

  3 
  

  

  2 
  

  

  3 
  

  

  4 
  

  

  i 
  

  

  91 
  

  

  10. 
  Lingula 
  

  

  1? 
  

  

  ?, 
  

  

  3 
  

  

  4 
  

  

  1 
  

  

  

  

  

  

  1 
  

  

  3 
  

  

  1 
  

  

  1 
  

  

  

  15 
  

  

  11. 
  Megerlia 
  

  

  ?, 
  

  

  

  ?, 
  

  

  

  

  

  

  

  

  

  

  

  

  

  2 
  

  

  12. 
  LeptaBna 
  

  

  6 
  

  

  

  3 
  

  

  6 
  

  

  

  

  

  

  

  

  

  

  

  

  9 
  

  

  13. 
  Kingena 
  

  

  1 
  

  

  

  1 
  

  

  

  

  

  

  

  

  

  

  

  

  

  1 
  

  

  14. 
  Discina 
  

  

  18 
  

   4 
  

  

  3 
  

   8 
  

  

  2 
  

  

  8 
  

  

  3 
  

  

  

  T 
  

  

  

  1 
  

  

  1 
  

  

  1 
  

  

  1 
  

  

  3 
  

  

  

  23 
  

  

  4 
  

  

  15. 
  Argiope 
  

  

  16. 
  Crania 
  

  

  8 
  

  

  1 
  

  

  2 
  

  

  2 
  

  

  2 
  

  

  

  2 
  

  

  

  

  

  

  

  

  

  9 
  

  

  

  Total 
  

  

  1 
  s 
  

  

  1 
  

  

  14 
  

  

  1 
  1 
  

  

  10 
  

  

  4 
  

  

  

  

  3 
  

  

  4 
  

  

  5 
  

  

  5 
  

  

  7 
  

  

  4 
  

  

  3 
  

  

  89 
  

  

  

  275 
  

  

  3G 
  

  

  7 
  4 
  | 
  47 
  

  

  30 
  

  

  I 
  4 
  

  

  2G 
  

  

  

  

  1 
  

  

  

  21 
  

  

  

  "1 
  

  

  

  Lamellieeanchiata. 
  Monomyaria. 
  — 
  9 
  genera 
  and 
  19 
  species 
  occur. 
  

   12 
  of 
  the 
  19 
  appear 
  only 
  in 
  the 
  Portlandian 
  rocks, 
  no 
  species 
  pass- 
  

   ing 
  to 
  the 
  Purbecks 
  ; 
  the 
  remaining 
  7 
  species 
  come 
  either 
  from 
  the 
  

   Corallian 
  or 
  Kimmeridgian 
  beds 
  below, 
  and 
  6 
  species 
  actually 
  connect 
  

   the 
  two 
  formations; 
  they 
  are 
  named 
  in 
  the 
  analysis 
  of 
  the 
  Kimme- 
  

   ridge 
  Monomyaria. 
  

  

  