﻿450 
  R. 
  F. 
  TOMES 
  ON 
  LOWER-OOLITE 
  MADREPORARIA. 
  

  

  solid 
  axial 
  columella, 
  and 
  Montlivaltia 
  had 
  not. 
  He 
  was 
  perfectly 
  well 
  

   aware 
  of 
  the 
  difference 
  between 
  calicular 
  gemmation 
  and 
  periodical 
  

   increase 
  of 
  growth 
  ; 
  and 
  he 
  maintained 
  his 
  statement, 
  made 
  in 
  the 
  

   Palseontographical 
  Society's 
  work, 
  that 
  Montlivaltia 
  Holli 
  increased 
  

   by 
  calicular 
  gemmation. 
  He 
  did 
  not 
  consider 
  the 
  specimens 
  

   marked 
  Confusastrcea, 
  the 
  Adelastraa 
  of 
  Eeuss, 
  to 
  belong 
  to 
  that 
  

   genus. 
  After 
  expressing 
  his 
  opinion 
  about 
  the 
  great 
  variability 
  of 
  

   corals, 
  as 
  proved 
  during 
  the 
  late 
  deep-sea 
  researches, 
  he 
  condemned 
  

   the 
  practice 
  of 
  species-making 
  unless 
  there 
  were 
  very 
  wide 
  structural 
  

   distinctions 
  present. 
  He 
  stated 
  that 
  it 
  was 
  wrong 
  to 
  place 
  Tham- 
  

   nastrcea 
  amongst 
  the 
  Perforata 
  ; 
  for 
  it 
  only 
  had 
  perforate 
  septa, 
  a 
  

   feature 
  often 
  seen 
  in 
  aporose 
  corals. 
  Its 
  true 
  position 
  was 
  amongst 
  

   the 
  Fungidse. 
  

  

  The 
  Author, 
  in 
  reply, 
  maintained 
  his 
  views 
  as 
  to 
  the 
  identity 
  of 
  

   the 
  Axosmilia 
  Wrighti 
  and 
  the 
  Montlivaltia 
  Holli 
  with 
  the 
  genus 
  

   Donacosmilia. 
  He 
  insisted, 
  on 
  the 
  grounds 
  pointed 
  out 
  by 
  Milasche- 
  

   witsch 
  on 
  the 
  truly 
  perforate 
  character 
  of 
  Thamnastraia, 
  and 
  insisted 
  

   that 
  the 
  so-called 
  Thecosmilia 
  gregaria 
  always 
  increased 
  by 
  basal 
  

   gemmation, 
  and 
  never 
  by 
  flssiparity. 
  

  

  