﻿THE 
  " 
  WEISSEK 
  JURA 
  " 
  OF 
  BAVARIA. 
  159 
  

  

  through 
  the 
  middle 
  of 
  the 
  radial 
  towards 
  the 
  upper 
  articular 
  surface. 
  

   At 
  the 
  point 
  where 
  the 
  branches 
  unite 
  is 
  a 
  ring-canal, 
  which 
  joius 
  

   together 
  all 
  the 
  radial 
  canals. 
  The 
  courso 
  of 
  these 
  canals 
  proves 
  

   that 
  basals 
  were 
  originally 
  present, 
  perhaps 
  even 
  in 
  the 
  young 
  stages, 
  

   and 
  that 
  their 
  atrophied 
  remains 
  are 
  perhaps 
  still 
  enclosed 
  within 
  

   the 
  adoral 
  (oberen) 
  portion 
  of 
  the 
  radials." 
  It 
  will 
  be 
  noticed 
  that 
  

   v. 
  Zittel 
  and 
  Beyrich 
  rely 
  on 
  the 
  same 
  major 
  premiss 
  as 
  Carpenter. 
  

   Seeing 
  that 
  Carpenter 
  had 
  omitted 
  to 
  notice 
  v. 
  Zittel's 
  argument, 
  I 
  

   feared 
  that 
  the 
  minor 
  premiss 
  might 
  have 
  broken 
  down, 
  and 
  that 
  

   the 
  arrangement 
  of 
  the 
  canals 
  was 
  not 
  as 
  above 
  described. 
  But 
  

   Professor 
  von 
  Zittel 
  has 
  been 
  kind 
  enough 
  to 
  inform 
  me 
  that 
  his 
  

   account 
  was 
  based 
  on 
  an 
  examination 
  of 
  silicified 
  and 
  weathered 
  

   specimens, 
  in 
  which 
  the 
  canals 
  were 
  clearly 
  preserved, 
  and 
  of 
  a 
  series 
  

   of 
  thin 
  transverse 
  sections 
  ; 
  he 
  is 
  perfectly 
  certain 
  that 
  his 
  account 
  

   is 
  correct, 
  the 
  more 
  so 
  in 
  that 
  it 
  had 
  been 
  verified 
  by 
  Prof. 
  Beyrich. 
  

   The 
  same 
  arrangement 
  of 
  canals 
  obtains 
  in 
  Phyllocrinus 
  * 
  ; 
  here 
  

   too, 
  then, 
  the 
  basals 
  are 
  represented 
  in 
  the 
  calyx. 
  It 
  is 
  true 
  that 
  

   no 
  Eugeniacrinid 
  has 
  hitherto 
  been 
  found 
  that 
  shows 
  clear 
  traces 
  

   of 
  separate 
  basals 
  f 
  , 
  but 
  this 
  does 
  not 
  turn 
  v. 
  Zittel's 
  position. 
  Dr. 
  

   Carpenter 
  tells 
  me 
  that 
  he 
  has 
  never 
  seen 
  the 
  specimens, 
  but 
  still 
  

   considers 
  the 
  structure 
  as 
  described 
  by 
  v. 
  Zittel 
  to 
  be 
  anomalous. 
  

   With 
  all 
  deference 
  to 
  Dr. 
  Carpenter, 
  I 
  submit 
  that, 
  till 
  disproved, 
  

   we 
  are 
  bound 
  to 
  accept 
  the 
  evidence 
  of 
  v. 
  Zittel 
  and 
  Beyrich, 
  even 
  

   though 
  the 
  facts 
  may 
  clash 
  with 
  our 
  own 
  ideas 
  of 
  what 
  is 
  proper 
  for 
  

   a 
  crinoid. 
  

  

  I 
  therefore 
  maintain 
  that 
  in 
  previously 
  known 
  Eugeniacrinidse 
  

   the 
  " 
  article 
  basal 
  " 
  is 
  a 
  top 
  stem-joint 
  J, 
  and 
  that 
  the 
  basals 
  are 
  

   represented 
  on 
  the 
  inner 
  side 
  of 
  the 
  radials 
  ; 
  and 
  I 
  infer 
  that 
  the 
  

   top 
  stem-joint 
  is 
  absent 
  from 
  our 
  specimens 
  of 
  Trigonocrinus, 
  and 
  

   that 
  the 
  " 
  basal 
  ring" 
  does 
  represent 
  fused 
  basals. 
  It 
  may 
  further 
  

   be 
  observed, 
  in 
  support 
  of 
  this 
  conclusion, 
  that 
  this 
  basal 
  ring 
  is 
  totally 
  

   unlike 
  the 
  solid 
  top 
  stem-joints 
  of 
  other 
  forms, 
  that 
  it 
  is 
  closely 
  

   attached 
  to 
  the 
  radials, 
  and 
  that, 
  in 
  accordance 
  with 
  v. 
  Zittel's 
  explan- 
  

   ation, 
  it 
  partly 
  projects 
  within 
  them. 
  

  

  Accepting 
  v. 
  Zittel's 
  argument, 
  we 
  shall 
  by 
  no 
  means 
  consider 
  it 
  

   odd 
  to 
  find 
  a 
  genus 
  of 
  the 
  Eugeniacrinidse 
  displaying 
  basals. 
  What 
  

   is 
  odd 
  is 
  that 
  these 
  basals 
  should 
  be 
  manifested 
  in 
  a 
  primitive 
  posi- 
  

   tion 
  by 
  a 
  genus 
  that 
  in 
  all 
  other 
  respects 
  seems 
  nearer 
  to 
  the 
  end 
  of 
  

   the 
  series, 
  and 
  therefore 
  further 
  away 
  from 
  the 
  primitive 
  basal- 
  

   bearing 
  form 
  — 
  a 
  genus, 
  too, 
  in 
  which 
  not 
  only 
  anchylosis, 
  but 
  actual 
  

   atrophy 
  of 
  calycal 
  elements 
  has 
  proceeded 
  to 
  a 
  far 
  greater 
  extent 
  

   than 
  in 
  any 
  other 
  crinoid, 
  except 
  Gymnocrinus 
  Moeschi, 
  de 
  Loriol. 
  

  

  * 
  V. 
  Zittel, 
  'Handb. 
  d. 
  Palaont.' 
  p. 
  386. 
  

  

  t 
  One 
  might 
  refer 
  to 
  E. 
  F. 
  von 
  Schlotheim, 
  ' 
  Nachtrage 
  zur 
  Petrefactenkuncle,' 
  

   2 
  Abth. 
  p. 
  102 
  (Grotha, 
  1823), 
  and 
  Atlas, 
  Versteinerungen, 
  &c., 
  pi. 
  xxviii. 
  f. 
  6. 
  b, 
  

   von 
  der 
  Seite, 
  c, 
  von 
  oben, 
  und 
  d, 
  von 
  unten, 
  eines 
  abweichendes 
  Kronenkopfs. 
  

   Apparently 
  Eug. 
  Moussoni 
  ; 
  6 
  d 
  shows 
  an 
  inner 
  circlet 
  of 
  5 
  plates, 
  of 
  which 
  the 
  

   radial 
  position 
  is 
  possibly 
  due 
  to 
  an 
  artist's 
  error. 
  

  

  \ 
  " 
  I 
  cannot 
  help 
  thinking 
  that 
  the 
  name 
  'article 
  basal' 
  is 
  an 
  unfortunate 
  

   one, 
  as 
  being 
  calculated 
  to 
  mislead." 
  — 
  P. 
  H. 
  Carpenter, 
  ' 
  Absence 
  of 
  Basals,' 
  &c.,. 
  

   he. 
  cit. 
  pp. 
  331-2. 
  It 
  certainly 
  has 
  nothing 
  to 
  do 
  with 
  basals. 
  

  

  