﻿Geology 
  and 
  Mineralogy. 
  337 
  

  

  4. 
  The 
  Relationship 
  of 
  the 
  Tetracoralla 
  to 
  the 
  Ilexacoralla 
  ; 
  

   by 
  W. 
  I. 
  Robinson. 
  Tran?. 
  Connecticut 
  Acad. 
  Arts 
  and 
  Sci., 
  

   vol. 
  xxi, 
  1917, 
  pp. 
  145-200, 
  pi. 
  I, 
  text 
  figs. 
  1-7. 
  — 
  The 
  conclusions 
  

   of 
  the 
  author 
  in 
  this 
  interesting 
  morphologic 
  paper 
  are 
  : 
  " 
  The 
  

   Tetracoralla 
  are 
  a 
  natural 
  group 
  differing 
  in 
  a 
  definite 
  structural 
  

   phenomenon 
  from 
  all 
  Mesozoic 
  and 
  later 
  forms 
  in 
  which 
  the 
  

   ontogeny 
  of 
  the 
  skeleton 
  is 
  known. 
  . 
  . 
  There 
  are 
  no 
  known 
  Hex- 
  

   acoralla 
  in 
  the 
  Paleozoic. 
  . 
  . 
  While 
  the 
  writer 
  does 
  not 
  pretend 
  

   to 
  have 
  settled 
  the 
  question 
  of 
  the 
  origin 
  of 
  the 
  Hexacoralla, 
  it 
  is 
  

   hoped 
  that 
  the 
  evidence 
  here 
  presented 
  will 
  be 
  conclusive 
  in 
  

   showing 
  that 
  there 
  are 
  no 
  known 
  Paleozoic 
  Hexacoralla, 
  and 
  that 
  

   the 
  data 
  furnished 
  by 
  this 
  study 
  of 
  Paleozoic 
  forms 
  favor 
  the 
  

   theory 
  of 
  direct 
  descent 
  of 
  modern 
  hexacorals 
  from 
  tetracorals." 
  

  

  " 
  The 
  Cyathophyllidse 
  and 
  Zaphrentidse 
  approached 
  Meso- 
  

   zoic 
  time 
  as 
  strong 
  stocks 
  capable 
  of 
  important 
  structural 
  varia- 
  

   tion. 
  A 
  marked 
  tendency 
  among 
  Carboniferous 
  forms 
  is 
  the 
  

   widespread 
  development 
  of 
  columellas. 
  Even 
  the 
  conservative 
  

   genus 
  Zaphrentis 
  w 
  r 
  as 
  subject 
  to 
  this 
  change. 
  The 
  columella 
  is 
  a 
  

   far 
  more 
  prominent 
  feature 
  of 
  the 
  Ilexacoralla 
  than 
  it 
  is 
  of 
  the 
  

   Tetracoralla. 
  A 
  correlative 
  tendency 
  is 
  toward 
  an 
  increase 
  in 
  

   the 
  number 
  of 
  septa 
  and 
  a 
  consequent 
  approach 
  to 
  radial 
  symme- 
  

   try." 
  (150, 
  153.) 
  c. 
  s. 
  

  

  5. 
  A 
  new 
  genus 
  and 
  species 
  of 
  the 
  Thecidiinae, 
  Geol. 
  Mag., 
  

   dec. 
  VI, 
  vol. 
  ii, 
  1915, 
  pp. 
  461-464, 
  text 
  fig. 
  1 
  ; 
  The 
  genera 
  of 
  Recent 
  

   and 
  Tertiary 
  rhynchonellids, 
  ibid., 
  pp. 
  387-392, 
  text 
  figs. 
  1, 
  2 
  ; 
  

   Additions 
  to 
  the 
  knowledge 
  of 
  the 
  Recent 
  and 
  Tertiary 
  Brachio- 
  

   poda 
  of 
  New 
  Zealand 
  and 
  Australia, 
  Trans. 
  New 
  Zealand 
  Inst., 
  

   vol. 
  xlviii, 
  1915, 
  1916, 
  pp. 
  41-47, 
  pi. 
  1. 
  By 
  J. 
  Allan 
  Thomson. 
  

   — 
  This 
  author 
  is 
  studying 
  the 
  Cenozoic 
  and 
  Recent 
  molluscs 
  and 
  

   brachiopods 
  of 
  the 
  New 
  Zealand 
  region 
  in 
  a 
  thorough 
  and 
  modern 
  

   manner. 
  In 
  these 
  papers 
  on 
  living 
  and 
  fossil 
  brachiopods 
  he 
  

   defines 
  the 
  following 
  new 
  genera 
  : 
  T/iecidellina, 
  JEtheia, 
  Liothy- 
  

   rella, 
  Neorhynchia, 
  and 
  Murravia. 
  c. 
  s. 
  

  

  6. 
  The 
  Tertiary 
  formations 
  of 
  western 
  Washington; 
  by 
  

   Charles 
  E. 
  Weaver. 
  Wash. 
  Geol. 
  Survey, 
  Bull. 
  13, 
  1916, 
  pp. 
  

   327, 
  pis. 
  30 
  (including 
  7 
  maps 
  in 
  pocket). 
  — 
  This 
  industrious 
  

   author 
  here 
  brings 
  together 
  all 
  that 
  he 
  and 
  others 
  know 
  of 
  the 
  

   topography 
  and 
  drainage, 
  the 
  pre-Tertiary 
  formations, 
  and, 
  in 
  the 
  

   main, 
  the 
  stratigraphy 
  of 
  the 
  Cenozoic 
  formations 
  of 
  western 
  

   Washington. 
  c. 
  s. 
  

  

  7. 
  Pcdeontologic 
  contributions 
  from 
  the 
  New 
  York 
  State 
  

   Museum 
  ; 
  by 
  Rudolf 
  Ritedemann. 
  New 
  York 
  State 
  Mus., 
  

   Bull. 
  189, 
  1916, 
  pp. 
  225, 
  pis. 
  36, 
  text 
  figs. 
  46.— 
  This 
  book 
  is 
  

   replete 
  with 
  much 
  that 
  is 
  new 
  and 
  of 
  considerable 
  importance 
  to 
  

   all 
  paleontologists. 
  Phvosites 
  turbinatus 
  is 
  shown 
  to 
  be 
  opercu- 
  

   late 
  ; 
  Plumalina 
  is 
  not 
  a 
  plant 
  but 
  an 
  alcyonarian 
  like 
  the 
  gor- 
  

   gonians 
  ; 
  the 
  problematic 
  Paropsonema 
  whose 
  structure 
  so 
  many 
  

   of 
  us 
  have 
  tried 
  to 
  guess 
  is 
  here 
  shown 
  to 
  be 
  probably 
  related 
  to 
  

   Porpita 
  and 
  thus 
  to 
  be 
  a 
  siphonophore 
  ; 
  of 
  asterids 
  twenty-two 
  

   species 
  are 
  described 
  and 
  the 
  new 
  genera 
  Clarkeaster, 
  Lepidas- 
  

  

  