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  DE. 
  G-. 
  J. 
  HTXDE 
  OX 
  AECF.EOCYATHUS 
  AXD 
  OTHEE 
  GEXEEA. 
  

  

  Fig. 
  10. 
  The 
  same. 
  A 
  portion 
  of 
  a 
  transverse 
  section 
  from 
  the 
  type 
  specimen, 
  

   enlarged 
  ten 
  diameters, 
  showing 
  the 
  characters 
  of 
  the 
  primary 
  and 
  

   supplementary 
  layers 
  of 
  the 
  wall-laminae. 
  

  

  Fig. 
  11. 
  Protopkaretm, 
  sp. 
  A 
  transverse 
  section 
  of 
  a 
  small 
  specimen, 
  enlarged 
  

   ten 
  diameters. 
  From 
  Cambrian 
  strata 
  at 
  Canal 
  Grande, 
  Sardinia. 
  

  

  Fig. 
  12. 
  ArchcBOScyphia 
  minganensis. 
  Bill., 
  sp. 
  A 
  fragment 
  of 
  the 
  type 
  speci- 
  

   men, 
  showing 
  portions 
  of 
  two 
  of 
  the 
  annular 
  platforms 
  and 
  the 
  

   canal-apertures 
  of 
  the 
  outer 
  surface 
  of 
  the 
  wall. 
  Natural 
  size. 
  

   From 
  the 
  Calciferous 
  formation 
  of 
  the 
  Mingan 
  Islands, 
  Lower 
  St. 
  

   Lawrence. 
  The 
  specimen 
  belongs 
  to 
  the 
  G-eological 
  Survey 
  of 
  Canada. 
  

  

  Fig. 
  13. 
  The 
  same. 
  A 
  portion 
  of 
  the 
  inner 
  surface 
  of 
  the 
  same 
  fragment, 
  show- 
  

   ing 
  the 
  inner 
  edges 
  of 
  the 
  longitudinal 
  plates 
  of 
  the 
  skeleton. 
  Natural 
  

   size. 
  

  

  Fig. 
  14. 
  The 
  same. 
  Spicules 
  of 
  the 
  sponge, 
  weathered 
  out 
  on 
  the 
  surface. 
  

   Enlarged 
  sixty 
  diameters. 
  

  

  Fig. 
  15. 
  Kipterella 
  paradoxica, 
  Bill., 
  sp. 
  Spicules 
  of 
  the 
  sponge 
  shown 
  in 
  

   microscopic 
  sections 
  of 
  the 
  interior. 
  Enlarged 
  sixty 
  diameters. 
  

   From 
  the 
  Calciferous 
  Formation 
  of 
  the 
  Mingan 
  Islands. 
  

  

  Discussion. 
  

  

  The 
  President, 
  after 
  remarking 
  that 
  the 
  Author 
  had 
  thrown 
  

   much 
  light 
  on 
  an 
  obscure 
  subject, 
  observed 
  that 
  the 
  paper 
  was 
  

   beyond 
  the 
  criticism 
  of 
  all 
  who 
  had 
  not 
  devoted 
  especial 
  study 
  to 
  

   sponges 
  and 
  corals. 
  The 
  Society 
  could 
  only 
  thank 
  Dr. 
  Hinde 
  for 
  

   his 
  able 
  descriptions. 
  It 
  was 
  satisfactory 
  to 
  have 
  so 
  difficult 
  a 
  

   group 
  cleared 
  up 
  in 
  such 
  a 
  manner, 
  and 
  interesting 
  to 
  find 
  that 
  

   even 
  in 
  these 
  very 
  old 
  rocks 
  there 
  were 
  no 
  forms 
  intermediate 
  

   between 
  corals 
  and 
  sponges, 
  though 
  the 
  corals 
  might 
  be 
  less 
  dif- 
  

   ferentiated 
  than 
  those 
  of 
  later 
  periods. 
  

  

  Mr. 
  E. 
  T. 
  Newton 
  paid 
  a 
  tribute 
  to 
  the 
  readiness 
  Dr. 
  Hinde 
  had 
  

   shown 
  in 
  affording 
  assistance 
  in 
  deciphering 
  certain 
  Durness 
  fossils. 
  

   One 
  of 
  the 
  most 
  obscure 
  of 
  these, 
  which 
  had 
  somewhat 
  the 
  appear- 
  

   ance 
  of 
  a 
  Yentriculite, 
  had 
  been 
  determined 
  by 
  Dr. 
  Hinde 
  to 
  be 
  a 
  

   siliceous 
  sponge, 
  but 
  he 
  wished 
  to 
  know 
  if 
  the 
  Author 
  had 
  seen 
  

   spicules 
  in 
  the 
  Scotch 
  specimens. 
  

  

  The 
  Aeteoe 
  had 
  not 
  found 
  spicules 
  in 
  the 
  Scotch 
  specimens 
  

   themselves 
  ; 
  but 
  they 
  occurred 
  in 
  the 
  same 
  rock. 
  He 
  thanked 
  the 
  

   meeting 
  for 
  the 
  way 
  they 
  had 
  received 
  his 
  paper. 
  

  

  