﻿264 
  A. 
  W. 
  WATERS 
  ON 
  EOSSIL 
  CHILOSTOMATOT7S 
  BRYOZOA 
  

  

  19. 
  Membranipora 
  ARTicuLATA,sp.nov. 
  (in 
  Vinculariai 
  forma). 
  Plate 
  

   VIII. 
  figs. 
  15, 
  16. 
  

  

  Zoarium 
  quadrilateral, 
  erect. 
  Zooecia 
  on 
  all 
  four 
  faces, 
  sur- 
  

   rounded 
  by 
  an 
  elongate 
  hexagonal 
  band 
  ; 
  aperture 
  long, 
  rounded 
  

   above, 
  with 
  straight 
  sides 
  and 
  straight 
  on 
  the 
  proximal 
  end. 
  A 
  

   small, 
  acute 
  avicularium 
  on 
  each 
  side, 
  on 
  a 
  line 
  with 
  the 
  top 
  of 
  the 
  

   aperture. 
  Aperture 
  037 
  millim. 
  long, 
  0*14 
  millim. 
  wide. 
  

  

  20. 
  Membranipora 
  perversa, 
  sp. 
  nov. 
  Plate 
  IX. 
  fig. 
  32. 
  

  

  Zoarium 
  in 
  Vincularice 
  forma. 
  Zooecia 
  arranged 
  quincuncially, 
  

   divided 
  by 
  a 
  raised 
  border 
  ; 
  the 
  lower 
  half 
  of 
  the 
  area 
  covered 
  with 
  

   a 
  calcareous 
  plate 
  ; 
  aperture 
  of 
  area 
  nearly 
  the 
  width 
  of 
  the 
  zooecium, 
  

   nearly 
  straight 
  on 
  the 
  distal 
  edge, 
  rounded 
  and 
  contracted 
  below. 
  

   Aperture 
  of 
  area 
  0*23 
  millim. 
  wide, 
  0-23 
  millim. 
  long. 
  A 
  spine 
  or 
  

   avicularium 
  just 
  above 
  the 
  area 
  on 
  each 
  side, 
  and 
  also 
  one 
  on 
  each 
  

   side 
  above 
  the 
  ovicell. 
  The 
  ovicell 
  is 
  small, 
  just 
  above 
  the 
  area 
  ; 
  but 
  

   in 
  the 
  fossil 
  all 
  are 
  broken 
  down. 
  

  

  21. 
  Membranipora, 
  sp. 
  

  

  The 
  cells 
  in 
  shape 
  resemble 
  those 
  of 
  M. 
  radicifera, 
  Hincks, 
  but 
  

   are 
  much 
  smaller, 
  only 
  measuring 
  022 
  millim. 
  by 
  6*11 
  millim. 
  Near 
  

   the 
  upper 
  end 
  there 
  were 
  several 
  spines 
  ; 
  and 
  the 
  broken-down 
  walls 
  

   of 
  the 
  ovicell 
  show 
  that 
  it 
  was 
  rather 
  large. 
  

  

  22. 
  Micropora 
  hippocrepis, 
  Goldf. 
  

  

  Cellepora 
  hippocrepis, 
  Goldf. 
  Petr. 
  i. 
  p. 
  26, 
  Taf. 
  ix. 
  fig. 
  3. 
  Reuss, 
  

   Foss. 
  Polyp, 
  d. 
  Wien. 
  Tert. 
  p. 
  94, 
  pi. 
  xi. 
  fig. 
  14. 
  Hag. 
  Die 
  Bry. 
  der 
  

   Maest. 
  Kreidef. 
  p. 
  91, 
  pi. 
  vi. 
  fig. 
  17. 
  

  

  Membranipora 
  bidens, 
  Busk, 
  Crag 
  Polyz. 
  p. 
  34, 
  pi. 
  ii. 
  fig. 
  4 
  ; 
  Busk, 
  

   Fossil 
  Polyz. 
  near 
  Mt. 
  Gambier, 
  Q. 
  J. 
  G. 
  S. 
  1860, 
  vol. 
  xvi. 
  p. 
  260. 
  

  

  Membranipora 
  RosseUi, 
  Manzoni, 
  Bry. 
  Foss. 
  Ital. 
  4ta 
  cont. 
  p. 
  11, 
  

   pi. 
  iii. 
  fig. 
  15. 
  

  

  Membranipora 
  bidens, 
  Reuss, 
  Die 
  foss. 
  Bry. 
  Ost.-Ung. 
  p. 
  43, 
  

   pi. 
  x. 
  figs. 
  10, 
  11. 
  Manz. 
  Bri. 
  Castrocaro, 
  p. 
  15, 
  pi. 
  ii. 
  fig. 
  4. 
  

   Waters 
  ; 
  Bry. 
  from 
  Bruccoli, 
  Trans. 
  Manch. 
  Geol. 
  Soc. 
  vol. 
  xiv. 
  

   p. 
  467. 
  Seguenza, 
  Le 
  Form. 
  Terz. 
  nell 
  Prov. 
  di 
  Reggio, 
  pp. 
  80, 
  

   128, 
  198, 
  368; 
  Accad. 
  dei 
  Lincei, 
  ser. 
  3a, 
  vol. 
  vi. 
  1877 
  (pub. 
  

   1880). 
  

  

  Membranipora 
  deplanata, 
  Rss. 
  

  

  I 
  formerly 
  followed 
  Mr. 
  Busk 
  and 
  others 
  in 
  considering 
  this 
  the 
  

   M. 
  bidens 
  of 
  Hagenow 
  ; 
  but 
  that 
  would 
  seem 
  to 
  belong 
  to 
  another 
  

   genus, 
  as 
  the 
  aperture 
  does 
  not 
  seem 
  to 
  have 
  been 
  the 
  oral 
  aperture, 
  

   but 
  was 
  covered 
  with 
  a 
  membrane 
  in 
  which 
  was 
  a 
  smaller 
  oral 
  lid, 
  

   resembling 
  Membranipora 
  Rosselii, 
  Aud., 
  and 
  other 
  Membranipora? 
  ; 
  

   whereas 
  in 
  the 
  present 
  species 
  there 
  seems 
  reason 
  for 
  supposing 
  that 
  

   the 
  aperture 
  we 
  see 
  is 
  the 
  oral 
  aperture. 
  On 
  this 
  point 
  the 
  recent 
  

   specimen 
  I 
  have 
  from 
  Capri 
  does 
  not 
  throw 
  any 
  light, 
  as 
  all 
  the 
  

   organic 
  parts, 
  including 
  the 
  opercula, 
  have 
  disappeared. 
  The 
  zooecia, 
  

   in 
  my 
  Mediterranean 
  specimen, 
  are 
  somewhat 
  smaller 
  (nearly 
  a 
  

  

  