﻿Geology 
  and 
  Natural 
  History, 
  83 
  

  

  determined 
  (46 
  new). 
  Of 
  brachiopods 
  there 
  are 
  2 
  new 
  species. 
  

   (5) 
  Miss 
  Rathbun 
  describes 
  31 
  forms 
  of 
  decapods 
  and 
  of 
  these 
  

   22 
  are 
  specifically 
  determined 
  (17 
  new). 
  Much 
  of 
  the 
  material 
  

   is 
  better 
  preserved 
  than 
  is 
  usual 
  for 
  crabs, 
  and 
  is 
  a 
  great 
  addi- 
  

   tion 
  to 
  our 
  knowledge 
  of 
  West 
  Indian 
  Cenozoic 
  crustaceans. 
  

   The 
  illustrations 
  are 
  excellent 
  throughout. 
  c. 
  s. 
  

  

  2. 
  Fossil 
  Bryozoa 
  from 
  the 
  West 
  Indies; 
  by 
  Ferdinand 
  

   Canu 
  and 
  Ray 
  S. 
  Bassler. 
  Carnegie 
  Institution 
  of 
  Washing- 
  

   ton, 
  Pub. 
  No. 
  291, 
  pp. 
  73-102, 
  pis. 
  1-7, 
  1919.— 
  In 
  this 
  little 
  work 
  

   are 
  described 
  and 
  illustrated 
  forty-two 
  species 
  of 
  Oligocene 
  and 
  

   Lower 
  Miocene 
  Bryozoa 
  from 
  the 
  West 
  Indies 
  and 
  Costa 
  Rica. 
  

   Twenty-five 
  species 
  are 
  new 
  to 
  science, 
  along 
  with 
  three 
  genera 
  

   (Cupuladria, 
  Acanthodesia, 
  Corynostylus). 
  Some, 
  of 
  the 
  species 
  

   have 
  a 
  very 
  wide 
  distribution 
  in 
  America, 
  Europe, 
  and 
  else- 
  

   where, 
  and 
  therefore 
  are 
  excellent 
  time 
  markers 
  and 
  checks 
  on 
  

   intercontinental 
  correlation. 
  Here 
  an 
  older 
  Frenchman 
  and 
  a 
  

   younger 
  American 
  are 
  knitting 
  together 
  their 
  knowledge 
  of 
  

   bryozoans 
  for 
  the 
  benefit 
  of 
  American 
  stratigraphers. 
  c. 
  s. 
  

  

  3. 
  The 
  Silurian 
  Geology 
  and 
  Faunas 
  of 
  Ontario 
  Peninsula, 
  

   and 
  Manitoxdin 
  and 
  adjacent 
  Islands; 
  by 
  M. 
  Y. 
  Williams. 
  

   Geol. 
  Survey 
  of 
  Canada, 
  Mem. 
  Ill, 
  195 
  pp., 
  34 
  pis., 
  6 
  text 
  figs., 
  

   2 
  geol. 
  maps, 
  1919. 
  — 
  This 
  is 
  a 
  thorough 
  work 
  describing 
  and 
  

   mapping 
  the 
  various 
  Silurian 
  formations 
  throughout 
  the 
  Prov- 
  

   ince 
  of 
  Ontario, 
  and 
  correlating 
  them 
  with 
  equivalent 
  strata 
  in 
  

   New 
  York, 
  Ohio, 
  Illinois, 
  and 
  Michigan. 
  The 
  Devonian 
  forma- 
  

   tions 
  are 
  also 
  mapped. 
  In 
  chapter 
  six 
  are 
  described 
  the 
  eco- 
  

   nomic 
  products 
  and 
  in 
  chapter 
  seven 
  are 
  discussed 
  or 
  described 
  

   twenty 
  Silurian 
  species 
  of 
  fossils, 
  of 
  which 
  ten 
  are 
  new. 
  The 
  

   characteristic 
  fossils 
  of 
  the 
  various 
  formations 
  are 
  illustrated 
  on 
  

   plates 
  II 
  to 
  XXVII. 
  The 
  author 
  is 
  to 
  be 
  congratulated 
  on 
  this 
  

   good 
  piece 
  of 
  work, 
  begun 
  in 
  1912. 
  c. 
  s. 
  

  

  4. 
  Geology 
  of 
  the 
  Disturbed 
  Belt 
  of 
  southwestern 
  Alberta; 
  

   by 
  J. 
  S. 
  Stewart. 
  Geol. 
  Survey 
  of 
  Canada, 
  Mem. 
  112, 
  71 
  pp., 
  

   5 
  pis., 
  1 
  map, 
  1919. 
  — 
  This 
  interesting 
  report 
  describes 
  the 
  physi- 
  

   ography, 
  geology, 
  and 
  economic 
  products 
  of 
  2000 
  square 
  miles 
  

   at 
  the 
  eastern 
  base 
  of 
  the 
  Rocky 
  Mountains 
  in 
  southwestern 
  

   Alberta. 
  The 
  formations 
  are 
  sedimentary 
  ones, 
  ranging 
  from 
  

   the 
  Lower 
  Cretaceous 
  to 
  the 
  Pleistocene, 
  with 
  a 
  thickness 
  of 
  over 
  

   14,000 
  feet. 
  The 
  great 
  bulk 
  of 
  the 
  deposits 
  are 
  of 
  Cretaceous 
  

   age, 
  five 
  formations 
  making 
  an 
  almost 
  complete 
  sequence 
  of 
  the 
  

   sea 
  of 
  this 
  protracted 
  time. 
  All 
  are 
  now 
  intensely 
  folded 
  and 
  

   faulted. 
  c. 
  s. 
  

  

  5. 
  New 
  Species 
  of 
  Pelecypods 
  from 
  the 
  Cretaceous 
  of 
  North- 
  

   ern 
  Alberta; 
  by 
  F. 
  H. 
  McLearn. 
  Geol. 
  Survey 
  Canada, 
  Mus. 
  

   Bull. 
  29, 
  pp. 
  9-12, 
  pis. 
  3-5, 
  1919. 
  Cretaceous, 
  Lower 
  Smoky 
  

   River, 
  Alberta; 
  by 
  F. 
  H. 
  McLearn. 
  Geol. 
  Survey 
  Canada, 
  

   Summ. 
  Rept. 
  1918, 
  Part 
  C, 
  8 
  pp., 
  1919. 
  — 
  Here 
  are 
  described 
  nine 
  

   species 
  of 
  bivalves, 
  two 
  from 
  the 
  Cretaceous 
  and 
  seven 
  from 
  the 
  

  

  