﻿ANNIVERSARY 
  ADDRESS 
  OF 
  THE 
  PRESIDENT. 
  1 
  69 
  

  

  terizes 
  only 
  one 
  zone, 
  that 
  of 
  Am. 
  oocynotus, 
  in 
  which 
  there 
  are 
  

   6 
  species. 
  

  

  The 
  stratigraphical 
  or 
  zonal 
  distribution 
  of 
  the 
  Middle-Lias 
  

   Ammonites, 
  also 
  through 
  the 
  6 
  zones, 
  is 
  as 
  follows 
  : 
  — 
  

  

  Species. 
  

  

  The 
  zone 
  of 
  iEgoceras 
  armatum 
  3 
  

  

  „ 
  Jamesoni 
  4 
  

  

  Amaltheus 
  ibex 
  5 
  

  

  ^Egoceras 
  Henleyi 
  8 
  

  

  Amaltheus 
  margaritatus 
  4 
  

  

  „ 
  spinatus 
  2 
  

  

  26 
  

  

  In 
  the 
  family 
  Lytoceratidae, 
  the 
  genus 
  Phylloceras 
  contains 
  

   2 
  species 
  and 
  Lytoceras 
  2 
  species 
  in 
  the 
  Middle 
  Lias. 
  

  

  The 
  Upper 
  Lias 
  contains 
  36 
  species, 
  Lytoceras 
  4, 
  Phylloceras 
  2, 
  

   Haripoceras 
  24, 
  and 
  Stejohanoceras 
  6 
  species. 
  

  

  The 
  zone 
  of 
  Harpoceras 
  serpentinum 
  .... 
  7 
  species. 
  

  

  „ 
  „ 
  bifrons 
  15 
  „ 
  

  

  „ 
  Lytoceras 
  jurense 
  13 
  ,, 
  

  

  „ 
  Harpoceras 
  opalinum 
  4 
  „ 
  

  

  For 
  lists 
  of 
  some 
  species 
  in 
  the 
  above 
  zones 
  see 
  Dr. 
  "Wright, 
  

   (Monogr. 
  Lias 
  Ammonites, 
  Pal. 
  Soc. 
  part 
  ii. 
  Lias 
  Form. 
  pp. 
  66, 
  113, 
  

   and 
  163). 
  

  

  The 
  zone 
  of 
  Arietites 
  raricostatus 
  has 
  been 
  recognized 
  in 
  the 
  

   British 
  Islands, 
  Switzerland, 
  France 
  and 
  

   Germany, 
  Austria 
  and 
  Italy. 
  

  

  „ 
  Amaltheus 
  oxynotus 
  in 
  England, 
  France 
  *, 
  Switzer- 
  

  

  land, 
  Germany 
  *, 
  and 
  Austria. 
  

  

  „ 
  Arietites 
  obtusus 
  in 
  England, 
  Belgium, 
  France, 
  Swit- 
  

  

  zerland, 
  Germany, 
  Austria, 
  and 
  Italy. 
  

  

  „ 
  „ 
  Turneri 
  in 
  England, 
  Belgium, 
  France, 
  

  

  Switzerland, 
  Germany, 
  and 
  Italy. 
  

  

  „ 
  „ 
  Buclclandi 
  in 
  the 
  British 
  islands, 
  Belgium, 
  

  

  France, 
  Switzerland, 
  Germany, 
  Austria, 
  

   and 
  Italy. 
  

  

  „ 
  uiEgocerus 
  angulatum 
  in 
  the 
  same 
  areas. 
  

  

  „ 
  „ 
  jplanorbis 
  in 
  all 
  but 
  Italy. 
  

  

  Associated 
  with 
  these 
  Lower-Lias 
  Ammonites 
  in 
  their 
  respective 
  

   zones, 
  in 
  all 
  the 
  above 
  regions, 
  occurs 
  nearly 
  the 
  same 
  fauna 
  as 
  

   in 
  the 
  British 
  isles. 
  The 
  Middle 
  and 
  Upper 
  Lias 
  type 
  forms 
  

   exhibit 
  the 
  same 
  constancy 
  in 
  distribution, 
  except 
  that 
  in 
  France 
  

   two 
  more 
  departments 
  possess 
  the 
  Middle-Lias 
  zones, 
  represented 
  

   by 
  a 
  rich 
  fauna. 
  

  

  * 
  France 
  in 
  four 
  departments, 
  and 
  Germany 
  in 
  Hanover 
  and 
  Wiirt 
  

   temberg. 
  

  

  