﻿232 
  Scientific 
  Intelligence. 
  

  

  in 
  regard 
  to 
  his 
  epipodites, 
  structures 
  unknown 
  in 
  any 
  other 
  

   trilobites, 
  it 
  is 
  difficult 
  to 
  understand 
  why 
  these 
  are 
  not 
  exopo- 
  

   dites. 
  The 
  other 
  new 
  structures 
  which 
  Walcott 
  calls 
  exites 
  have 
  

   been 
  seen 
  in 
  but 
  a 
  single 
  and 
  very 
  badly 
  crushed 
  specimen, 
  and 
  

   one 
  is 
  at 
  a 
  loss 
  to 
  know 
  what 
  they 
  represent, 
  as 
  there 
  is 
  nothing 
  

   in 
  other 
  trilobites 
  with 
  which 
  to 
  compare 
  them. 
  They 
  do 
  not 
  

   appear 
  to 
  be 
  breathing 
  organs 
  or 
  brood 
  pouches, 
  but 
  because 
  of 
  

   the 
  irregular, 
  prominent 
  spines 
  on 
  the 
  coxopodites, 
  the 
  like 
  of 
  

   which 
  are 
  seen 
  elsewhere 
  only 
  in 
  Neolenus, 
  one 
  is 
  led 
  to 
  speculate 
  

   as 
  to 
  whether 
  these 
  exites 
  are 
  not 
  after 
  all 
  only 
  the 
  basal 
  joints 
  

   of 
  the 
  crawling 
  legs. 
  

  

  Professor 
  Percy 
  E. 
  Raymond, 
  of 
  Harvard 
  University, 
  has 
  

   been 
  engaged 
  for 
  two 
  years 
  on 
  a 
  somewhat 
  similar 
  study 
  of 
  the 
  

   ventral 
  anatomy 
  of 
  the 
  trilobites, 
  which 
  he 
  intended 
  to 
  publish 
  

   last 
  year; 
  upon 
  learning 
  of 
  "Walcott 
  's 
  present 
  study, 
  however, 
  

   he 
  laid 
  his 
  work 
  aside 
  to 
  await 
  its 
  appearance. 
  Through 
  the 
  

   kindness 
  of 
  Walcott, 
  Raymond 
  has 
  had 
  access 
  to 
  the 
  more 
  critical 
  

   specimens 
  of 
  Neolenus, 
  and 
  his 
  results 
  will 
  appear 
  during 
  this 
  

   year 
  in 
  the 
  memoirs 
  of 
  the 
  Connecticut 
  Academy. 
  

  

  The 
  trilobite, 
  Walcott 
  says, 
  "is 
  a 
  primitive 
  crustacean,'' 
  

   originating 
  "far 
  back 
  on 
  the 
  line 
  of 
  descent 
  from 
  the 
  original 
  

   crustacean 
  type 
  which 
  existed 
  in 
  pre-Cambrian 
  or 
  Lipalian 
  

   time. 
  ' 
  ' 
  Their 
  main 
  food, 
  he 
  thinks, 
  was, 
  annelids, 
  and 
  some 
  of 
  

   the 
  trilobites 
  grubbed 
  for 
  them 
  in 
  the 
  mud. 
  He 
  figures 
  many 
  

   tracks 
  and 
  burrows, 
  not 
  all 
  of 
  which, 
  however, 
  appear 
  to 
  have 
  

   been 
  made 
  by 
  trilobites. 
  In 
  conclusion, 
  we 
  must 
  add 
  that 
  no 
  

   greater 
  discovery 
  of 
  fossils 
  ever 
  was 
  made 
  than 
  that 
  of 
  Walcott 
  

   in 
  the 
  Middle 
  Cambrian 
  rocks 
  ' 
  ' 
  on 
  the 
  ridge 
  connecting 
  Mounts 
  

   Wapta 
  and 
  Field," 
  near 
  Field, 
  British 
  Columbia. 
  Walcott 
  's 
  

   recent 
  publications 
  have 
  opened 
  a 
  wonderland 
  in 
  which 
  all 
  

   paleontologists 
  will 
  revel 
  and 
  learn 
  of 
  a 
  host 
  of 
  invertebrate 
  

   organisms 
  such 
  as 
  was 
  expected 
  by 
  no 
  one 
  from 
  these 
  ancient 
  

   rocks. 
  c. 
  s. 
  

  

  2. 
  Mississippian 
  formations 
  of 
  western 
  Kentucky. 
  I. 
  

   Descriptions 
  and 
  correlation 
  of 
  the 
  Mississippian 
  formations 
  of 
  

   western 
  Kentucky; 
  by 
  Charles 
  Butts, 
  pp. 
  7-119, 
  pis. 
  1-28. 
  

   II. 
  The 
  formations 
  of 
  the 
  Chester 
  series 
  in 
  western 
  Kentucky 
  

   and 
  their 
  correlates 
  elsewhere; 
  by 
  E. 
  0. 
  Ulbich, 
  pp. 
  1-272, 
  pis. 
  

   1-11. 
  Kentucky 
  Geological 
  Survey, 
  1917 
  (on 
  the 
  title 
  page 
  the 
  

   date 
  is 
  given 
  as 
  1917, 
  on 
  the 
  cover 
  as 
  1918, 
  but 
  the 
  book 
  was 
  not 
  

   received 
  at 
  New 
  Haven 
  until 
  January 
  30, 
  1919). 
  — 
  This 
  is 
  a 
  

   very 
  comprehensive 
  and 
  detailed 
  report 
  on 
  the 
  Mississippian 
  

   formations 
  of 
  western 
  Kentucky, 
  and 
  more 
  especially 
  those 
  of 
  

   the 
  Chester 
  series 
  of 
  the 
  Mississippi 
  valley. 
  It 
  is 
  a 
  great 
  con- 
  

   Irihulion 
  to 
  American 
  stratigraphy, 
  and 
  is 
  the 
  result 
  of 
  coop- 
  

   eration 
  between 
  the 
  Kentucky 
  Geological 
  Survey 
  and 
  the 
  United 
  

   States 
  Geological 
  Survey. 
  Barring 
  the 
  peculiar 
  title 
  page, 
  

   which 
  gives 
  no 
  idea 
  of 
  the 
  actual 
  content 
  of 
  the 
  volume 
  nor 
  who 
  

  

  