﻿34 
  GEOLOGICAL 
  MEMOIES. 
  

  

  C. 
  The 
  Upper 
  Jura, 
  of 
  relatively 
  small 
  extent 
  in 
  North-western 
  

   Germany, 
  and 
  well 
  opened 
  out 
  by 
  the 
  limestone-quarries, 
  is 
  well 
  

   known 
  in 
  its 
  subdivisions, 
  of 
  which 
  the 
  author 
  makes 
  ten. 
  1. 
  

   The 
  Macrocephalus-beds, 
  with 
  A. 
  macrocephalus, 
  A. 
  Gowerianus, 
  

   A. 
  funatus, 
  A. 
  calvus, 
  and 
  Pleuromya 
  donacina. 
  2. 
  The 
  Ornatus- 
  

   clay, 
  with 
  A. 
  cordatus 
  (?), 
  Nucida 
  Pollux, 
  A. 
  Lamberti, 
  A. 
  

   ornatus, 
  A. 
  Jason, 
  and 
  Gryphcza 
  dilatata 
  (more 
  abundant 
  higher 
  

   up). 
  3. 
  The 
  Hersum 
  beds, 
  with 
  Gryphcea 
  dilatata, 
  A. 
  dicatilis, 
  

   A. 
  cordatus 
  (in 
  lowest 
  part), 
  Belemnites 
  eoccentralis, 
  A. 
  perarmatus, 
  

   Modiola 
  bipartita, 
  Lima 
  pectiniformis, 
  A. 
  mendax, 
  and 
  Terebra- 
  

   tula 
  Galliennei. 
  4. 
  The 
  Coral-beds, 
  with 
  Isastrcea 
  heliantJioides. 
  

   5. 
  The 
  Coral-oolite, 
  with 
  Cerithium 
  limceforme, 
  Cidaris 
  jlorigemma, 
  

   Phynchonella 
  pinguis, 
  Pecten 
  varians, 
  Astarte 
  Icevis, 
  A. 
  plana, 
  and 
  

   Lucina 
  aliena. 
  6. 
  The 
  Nerimea-Yisurgis-beds, 
  with 
  N. 
  Visurgis, 
  

   Cerithium 
  septemplicatum, 
  C. 
  astartinum, 
  Chemnitzia 
  Bronnii, 
  C. 
  

   abbreviata, 
  and 
  Astarte 
  scuteUata. 
  7. 
  The 
  Pteroceras-beds, 
  with 
  

   Terebratula 
  subsella 
  (especially 
  in 
  the 
  higher 
  part), 
  Avicula 
  modio- 
  

   laris, 
  Lucina 
  substriata, 
  Astarte 
  circularis, 
  Trigonia 
  gibbosa, 
  and 
  

   Pteroceras 
  Oceani. 
  8. 
  The 
  Exogyra-virgula-beds, 
  with 
  E. 
  virgida, 
  

   and 
  Plioladomya 
  acuticosta. 
  9. 
  The 
  Ammonites-gigas-beds. 
  10. 
  

   The 
  Purbeck 
  beds, 
  covering 
  the 
  Portland 
  beds, 
  with, 
  1st, 
  more 
  than 
  

   200 
  feet 
  of 
  limestone 
  (the 
  Einbeekhauser 
  Plattenkalk), 
  containing 
  

   coniferous 
  wood, 
  Corbida 
  injiexa, 
  and 
  a 
  little 
  Estheria 
  ; 
  2nd, 
  the 
  red 
  

   Purbeck 
  marls, 
  unfossiliferous, 
  and 
  more 
  than 
  100 
  feet 
  thick 
  ; 
  3rd, 
  

   The 
  Serpula-rock 
  (" 
  Serpulit 
  "), 
  about 
  20 
  feet 
  thick, 
  made 
  up 
  

   largely 
  of 
  Serpula 
  coarcervata, 
  and 
  containing 
  teeth 
  of 
  Pycnodus. 
  

   The 
  true 
  Wealden 
  beds 
  succeed. 
  

  

  General 
  remarks 
  on 
  these 
  groups 
  of 
  strata 
  follow 
  (pp. 
  61-70) 
  ; 
  and 
  

   at 
  page 
  70 
  Yon 
  Seebach 
  says 
  : 
  — 
  The 
  Hanoverian 
  Jura-formation 
  is 
  

   in 
  its 
  lower 
  portion, 
  up 
  to 
  the 
  Cornbrash, 
  most 
  like 
  that 
  of 
  South 
  

   Germany, 
  and 
  was 
  evidently 
  closely 
  connected 
  with 
  it 
  in 
  its 
  origin. 
  

   Contemporaneously 
  with 
  the 
  formation 
  of 
  the 
  Baltic 
  Jura 
  commenced 
  

   an 
  approach 
  to 
  the 
  Franco-English 
  type. 
  This 
  similarity 
  holds 
  good 
  

   for 
  all 
  the 
  Oxfordian 
  Group. 
  The 
  Kimmeridgian 
  Group 
  is 
  in 
  many 
  

   respects 
  peculiar 
  ; 
  but 
  it 
  shows 
  some 
  alliance 
  with 
  that 
  of 
  Northern 
  

   Erance. 
  The 
  Purbeck 
  beds 
  are 
  peculiar, 
  

  

  In 
  the 
  Pakeontological 
  half 
  of 
  the 
  book 
  (pp. 
  71 
  &c), 
  an 
  extensive 
  

   table 
  shows 
  the 
  geological 
  distribution, 
  vertical 
  range, 
  and 
  relative 
  

   abundance 
  of 
  the 
  Liassic, 
  Oolitic, 
  and 
  Purbeck 
  fossils 
  of 
  Hanover, 
  

   373 
  in 
  all— 
  10 
  Corals, 
  7 
  Crinoids, 
  1 
  Starfish, 
  11 
  Echinoids, 
  22 
  Bra- 
  

   chiopods, 
  160 
  Conchifers, 
  52 
  Gasteropods, 
  188 
  Cephalopods, 
  4 
  Eishes, 
  

   4 
  Reptiles, 
  besides 
  a 
  few 
  Annelids, 
  Crustaceans, 
  Plant-remains, 
  and 
  

   other 
  obscure 
  fossils. 
  

  

  The 
  last 
  portion 
  of 
  the 
  volume 
  (pp. 
  85-158) 
  consists 
  of 
  critical 
  

   remarks 
  on 
  known 
  species 
  (66) 
  and 
  description 
  of 
  new 
  species 
  (25), 
  

   and 
  is 
  accompanied 
  with 
  ten 
  well 
  -lithographed 
  plates 
  illustrating 
  

   forty-one 
  old 
  and 
  new 
  species. 
  [T. 
  R. 
  J.] 
  

  

  