﻿210 
  P. 
  E. 
  Raymond 
  — 
  Beecher' 
  s 
  Classification 
  of 
  Trilobites. 
  

  

  near 
  the 
  base 
  of 
  the 
  Opisthoparian 
  pyramid 
  as 
  high 
  in 
  the 
  

   Hypoparia 
  (Protoparia). 
  

  

  Proparia. 
  

  

  Calyrnenidoe. 
  — 
  When 
  I 
  was 
  preparing 
  the 
  revision 
  of 
  the 
  

   families 
  of 
  trilobites 
  for 
  the 
  second 
  edition 
  of 
  the 
  u 
  Eastman- 
  

   Zittel 
  " 
  Textbook 
  I 
  was 
  at 
  first 
  inclined 
  to 
  follow 
  the 
  sugges- 
  

   tion 
  of 
  Pompeckj* 
  and 
  others 
  and 
  place 
  this 
  family 
  near 
  the 
  

   Olenidse 
  in 
  the 
  Opisthoparia, 
  but 
  after 
  considerable 
  study 
  of 
  

   the 
  evidence 
  for 
  and 
  against, 
  left 
  the 
  family 
  where 
  Beecher 
  

   placed 
  it. 
  I 
  remember, 
  as 
  a 
  student, 
  asking 
  Beecher 
  why 
  this 
  

   family 
  was 
  placed 
  in 
  the 
  Proparia 
  rather 
  than 
  in 
  the 
  Opistho- 
  

   paria. 
  He 
  replied 
  that 
  while 
  as 
  a 
  group, 
  the 
  post-ocular 
  por- 
  

   tions 
  of 
  the 
  facial 
  sutures 
  cut 
  the 
  genal 
  angles, 
  in 
  Pharosto?na, 
  

   one 
  of 
  the 
  geologically 
  older 
  and 
  presumably 
  primitive 
  genera, 
  

   (also 
  so 
  considered 
  by 
  Pom 
  peck 
  j) 
  the 
  genal 
  spines 
  were 
  borne 
  by 
  

   the 
  fixed 
  cheeks 
  and 
  the 
  free 
  cheeks 
  were 
  decidedly 
  Proparian. 
  

   This 
  seems 
  a 
  proper 
  reason, 
  and 
  if 
  this 
  Proparian 
  family 
  can 
  be 
  

   derived 
  from 
  an 
  Olenid 
  stock, 
  so 
  much 
  the 
  better 
  for 
  our 
  gen- 
  

   eral 
  knowledge 
  of 
  trilobites. 
  In 
  addition 
  to 
  the 
  statement 
  in 
  

   regard 
  to 
  the 
  condition 
  of 
  the 
  cheeks 
  in 
  P 
  harostoma, 
  it 
  may 
  

   be 
  mentioned 
  that 
  the 
  cheeks 
  in 
  the 
  earlier 
  stages 
  of 
  the 
  develop- 
  

   ment 
  of 
  the 
  common 
  Calymene 
  senaria 
  of 
  the 
  American 
  Tren- 
  

   ton 
  are 
  also 
  distinctly 
  Proparian, 
  so 
  that 
  the 
  parallelism 
  of 
  the 
  

   adult 
  with 
  Triarihrus 
  in 
  this 
  matter 
  is 
  a 
  secondary 
  affair. 
  

  

  With 
  this 
  I 
  shall 
  close 
  my 
  remarks 
  on 
  the 
  objections 
  which 
  

   have 
  been 
  raised 
  to 
  the 
  Beecher 
  classification. 
  I 
  think 
  that 
  

   Professor 
  Swinnerton 
  has 
  sufficiently 
  shown 
  the 
  very 
  inade- 
  

   quate 
  basis 
  of 
  Gurich's 
  classification, 
  and 
  the 
  same 
  remarks 
  

   with 
  which 
  an 
  eminent 
  investigator 
  has 
  dismissed 
  Professor 
  

   Jaekel's 
  suggested 
  classification 
  of 
  the 
  reptiles 
  may 
  be 
  applied 
  

   to 
  the 
  result 
  of 
  his 
  endeavors 
  in 
  behalf 
  of 
  the 
  trilobites. 
  To 
  

   discuss 
  at 
  the 
  present 
  time 
  Professor 
  Swinnerton's 
  proposed 
  

   sub-orders 
  and 
  families 
  would 
  not 
  be 
  appropriate. 
  The 
  sam- 
  

   ples 
  which 
  Dr. 
  Walcott 
  has 
  recently 
  been 
  giving 
  us 
  of 
  his 
  

   wonderful 
  store 
  of 
  Cambrian 
  trilobites 
  indicate 
  clearly 
  the 
  

   futility 
  of 
  proceeding 
  to 
  the 
  refinements 
  of 
  classification 
  until 
  

   that 
  fauna 
  is 
  quite 
  fully 
  described. 
  

  

  Museum 
  of 
  Comparative 
  Zoology, 
  

   Harvard 
  University, 
  

   Cambridge, 
  Mass. 
  

  

  * 
  Ueber 
  Calymmene 
  Brongniart. 
  Neues 
  Jahrb., 
  vol. 
  i, 
  1898, 
  p. 
  187. 
  

  

  