﻿234 
  Scientific 
  Intelligence. 
  

  

  The 
  first 
  four 
  of 
  the 
  submergent 
  stages 
  are 
  shown 
  in 
  the 
  paleo- 
  

   geographic 
  maps. 
  Comparison 
  of 
  these 
  gives 
  an 
  idea 
  of 
  the 
  kind 
  

   of 
  sea-shifting 
  that 
  accompanies 
  these 
  breaks 
  in 
  sedimentation' 
  7 
  

   (pp. 
  197-198). 
  

  

  Unfortunately 
  there 
  is 
  no 
  index 
  to 
  the 
  book, 
  though 
  the 
  two 
  

   tables 
  of 
  contents 
  will 
  in 
  a 
  way 
  help 
  one 
  to 
  find 
  again 
  what 
  he 
  

   has 
  read. 
  c. 
  s. 
  

  

  3. 
  Comanchean 
  and 
  Cretaceous 
  Pectinidae 
  of 
  Texas; 
  by 
  

   Hedwig 
  T. 
  Kniker. 
  Univ. 
  of 
  Texas 
  Bull. 
  No. 
  1817, 
  56 
  pp., 
  

   10 
  pis., 
  1918. 
  — 
  In 
  this 
  dissertation 
  for 
  the 
  master 
  of 
  arts 
  degree 
  

   at 
  the 
  University 
  of 
  Texas, 
  the 
  author 
  describes 
  four 
  new 
  species 
  

   of 
  Pecien, 
  and 
  twelve 
  new 
  and 
  eight 
  old 
  ones 
  of 
  Neithea. 
  The 
  

   work 
  is 
  a 
  revision 
  of 
  the 
  species, 
  but 
  not 
  of 
  the 
  genera. 
  Twenty 
  

   of 
  the 
  forms 
  are 
  from 
  the 
  Lower 
  Cretaceous, 
  and 
  four 
  from 
  the 
  

   Austin 
  chalk. 
  c. 
  s. 
  

  

  4. 
  Decapod 
  crustaceans 
  from 
  the 
  Panama 
  region; 
  by 
  Mary 
  

   J. 
  Rathbun. 
  U. 
  S. 
  Nat. 
  Mus., 
  Bull. 
  103, 
  pp. 
  123-184, 
  pis. 
  54-66, 
  

   1918. 
  — 
  The 
  large 
  collections 
  of 
  Tertiary 
  fossils 
  gathered 
  for 
  the 
  

   United 
  States 
  National 
  Museum 
  in 
  the 
  Panama 
  region 
  and 
  in 
  

   Costa 
  Rica 
  have 
  netted 
  sixty-one 
  forms 
  of 
  decapods. 
  Of 
  these, 
  

   forty-seven 
  are 
  specifically 
  named 
  in 
  the 
  work 
  under 
  review, 
  and 
  

   thirty-nine 
  are 
  new. 
  Of 
  new 
  genera 
  there 
  are 
  Calappella, 
  

   Mursilia, 
  and 
  Oatunia, 
  the 
  latter 
  being 
  the 
  basis 
  of 
  a 
  new 
  family. 
  

   Gatunia 
  proavita 
  is 
  one 
  of 
  the 
  finest 
  fossil 
  decapods 
  ever 
  found. 
  

   In 
  age 
  the 
  species 
  range 
  from 
  the 
  Oligocene 
  to 
  the 
  Pleistocene. 
  

  

  It 
  is 
  not 
  often 
  that 
  so 
  many 
  Tertiary 
  Crustacea 
  are 
  secured 
  

   from 
  any 
  one 
  area, 
  and 
  yet 
  this 
  collection 
  again 
  illustrates 
  the 
  

   imperfection 
  of 
  preservation 
  of 
  fossil 
  decapods, 
  as 
  but 
  four 
  spe- 
  

   cies 
  are 
  based 
  on 
  more 
  or 
  less 
  entire 
  individuals. 
  The 
  imperfec- 
  

   tion 
  of 
  the 
  geological 
  record 
  is 
  also 
  brought 
  out 
  in 
  this 
  collection, 
  

   as 
  eleven 
  living 
  genera 
  are 
  here 
  recorded 
  as 
  fossil 
  for 
  the 
  first 
  

   time. 
  The 
  most 
  remarkable 
  occurrence 
  among 
  these 
  fossils 
  is 
  

   one 
  of 
  the 
  Hexapodinae, 
  crabs 
  that 
  have 
  lost 
  the 
  last 
  pair 
  of 
  legs. 
  

   They 
  are 
  represented 
  in 
  the 
  Indo-Pacific 
  region 
  to-day 
  by 
  iiYe 
  

   genera 
  and 
  eight 
  species, 
  and 
  now 
  the 
  subfamily 
  is 
  carried 
  back 
  

   to 
  the 
  Oligocene. 
  No 
  one 
  other 
  than 
  Miss 
  Rathbun, 
  with 
  her 
  

   life-long 
  studies 
  of 
  recent 
  Crustacea, 
  could 
  have 
  made 
  so 
  much 
  

   of 
  value 
  out 
  of 
  this 
  collection. 
  c. 
  s. 
  

  

  5. 
  The 
  Radiolarian 
  Cherts 
  of 
  the 
  Franciscan 
  Group; 
  by 
  

   E. 
  F. 
  Davis. 
  Bull 
  Dept. 
  Geology, 
  Univ. 
  California, 
  11, 
  No. 
  3, 
  

   1918, 
  pp. 
  235-432, 
  pis. 
  25-36, 
  text 
  figs. 
  1-16.— 
  A 
  thorough 
  study 
  

   not 
  only 
  of 
  the 
  radiolarian 
  cherts 
  of 
  the 
  Jurassic 
  of 
  California, 
  

   but 
  of 
  the 
  Miocene 
  as 
  well. 
  In 
  his 
  search 
  through 
  the 
  literature 
  

   for 
  similar 
  occurrences 
  elsewhere, 
  the 
  author 
  has 
  gone 
  into 
  many 
  

   hinds, 
  and 
  all 
  the 
  evidence 
  which 
  he 
  found 
  is 
  made 
  use 
  of 
  to 
  

   explain 
  the 
  kind 
  of 
  seas 
  in 
  which 
  the 
  radiolarian 
  cherts 
  of 
  Cali- 
  

   fornia 
  were 
  deposited. 
  Some 
  of 
  his 
  conclusions 
  are 
  as 
  follows: 
  

  

  ' 
  'The 
  radiolarian 
  cherts 
  and 
  their 
  associated 
  shale 
  partings 
  

   do 
  not 
  represent 
  abyssal 
  radiolarian 
  ooze 
  and 
  Red 
  Clay, 
  but 
  

  

  