﻿INTERIOR 
  OOLITE 
  OF 
  SHTPTON 
  GORGE, 
  DOESET. 
  571 
  

  

  1. 
  Bisjdmonea 
  tetragona 
  (Lamx.), 
  var. 
  ovalis, 
  nov. 
  (PI. 
  XIX. 
  

  

  figs. 
  7-9.) 
  

  

  Spiropora 
  tetragona, 
  Lamouroux, 
  Exp. 
  Meth. 
  des 
  genres 
  des 
  Pol. 
  

   p. 
  85, 
  pi. 
  82. 
  figs. 
  9 
  & 
  10 
  (1821). 
  

  

  Cricopora 
  tetragona, 
  Michelin, 
  Icon. 
  Zooph. 
  p. 
  235, 
  pi. 
  55, 
  fig. 
  12 
  

   (1845). 
  

  

  EntalopJiora 
  tetragona, 
  d'Orbigny, 
  Pal. 
  Franc., 
  Terr. 
  Cre't. 
  p. 
  779 
  

   (1850-52). 
  

  

  Spiropora 
  tetragona, 
  Haime, 
  Descr. 
  des 
  Bryoz. 
  Foss. 
  Jurass. 
  p. 
  197 
  

   (1854). 
  

  

  EntalopJiora 
  tetragona, 
  Vine, 
  Notes 
  on 
  Polyzoa 
  of 
  Caen 
  and 
  

   Eanville, 
  p. 
  90 
  (1888). 
  

  

  Zoarial 
  width 
  1*4 
  millim. 
  ; 
  zoarial 
  width 
  short 
  axis 
  1*0 
  ; 
  

   zocecial 
  width 
  0*2 
  ; 
  apertures 
  0*13 
  to 
  0*8. 
  

  

  Zoarium 
  erect, 
  ramose 
  ; 
  stem 
  and 
  branches 
  cylindrical 
  and 
  com- 
  

   pressed. 
  Zooecia 
  short 
  (0'3 
  millim. 
  in 
  length), 
  ovoid, 
  arranged 
  in 
  

   irregularly 
  oblique 
  annulations, 
  walls 
  thick 
  and 
  projecting 
  above 
  

   the 
  zocecial 
  surface. 
  The 
  zooecia 
  forming 
  the 
  ridge 
  of 
  the 
  oval 
  stem 
  

   are 
  large 
  as 
  in 
  Idmonea. 
  Apertures 
  elliptical, 
  rarely 
  orbicular, 
  

   with 
  centrally 
  perforate 
  and 
  punctulate 
  closures 
  within 
  the 
  orifice. 
  

   Zoarial 
  surface 
  punctate. 
  Ovicells 
  long, 
  punctulate, 
  leech-like 
  

   swellings 
  along 
  the 
  ridge 
  of 
  the 
  oval 
  stem, 
  between 
  or 
  enveloping 
  

   ten 
  or 
  twelve 
  of 
  the 
  large 
  zocecia. 
  

  

  Vine 
  * 
  prefers 
  to 
  retain 
  Lamouroux's 
  generic 
  name 
  EntalopJiora 
  

   for 
  the 
  Ranville 
  species 
  ; 
  but 
  if 
  mode 
  of 
  reproduction, 
  which 
  is 
  exactly 
  

   similar 
  in 
  some 
  varieties 
  of 
  Idmonea 
  I 
  have 
  described, 
  is 
  of 
  generic 
  

   value 
  when 
  combined 
  with 
  a 
  distinct 
  shape 
  of 
  cell 
  and 
  aperture, 
  

   then 
  d'Orbigny's 
  genus 
  provides 
  a 
  good 
  resting-place 
  for 
  such 
  transi- 
  

   tion 
  forms 
  between 
  Idmonea 
  and 
  EntalopJiora. 
  

  

  Spiropora 
  compressa, 
  Haime, 
  appears 
  to 
  be 
  nearly 
  related. 
  

  

  EnTALOPHORA. 
  

  

  EntalopJiora, 
  Lamouroux, 
  Exp. 
  Meth. 
  des 
  Genres 
  des 
  Pol. 
  p. 
  81 
  

   (1821). 
  

  

  1. 
  Entalophora 
  richmondiense, 
  Vine, 
  var. 
  

  

  EntalopJiora 
  richmondiensis, 
  Yine, 
  Polyzoa 
  found 
  in 
  Boring 
  at 
  

   Richmond, 
  p. 
  791, 
  fig. 
  3, 
  Quart. 
  Journ. 
  Geol. 
  Soc. 
  vol. 
  xl. 
  1884. 
  

  

  Zocecial 
  length 
  0-3 
  to 
  0*5 
  millim., 
  width 
  0*2 
  ; 
  aperture 
  0*07 
  to 
  

   0-1. 
  

  

  The 
  size 
  of 
  zoarium, 
  zocecia, 
  and 
  apertures 
  agrees 
  fairly 
  with 
  

   Vine's 
  Richmond 
  species. 
  The 
  zooecia, 
  however, 
  vary 
  in 
  size 
  of 
  

   apertures, 
  which 
  are 
  frequently 
  furnished 
  with 
  closures. 
  The 
  

   arrangement 
  of 
  the 
  zooecia 
  differs 
  in 
  that 
  the 
  mouths 
  open 
  one 
  above 
  

   the 
  other 
  in 
  each 
  annulation, 
  whereas 
  in 
  E. 
  richmondiense, 
  accord- 
  

  

  * 
  " 
  Notes 
  on 
  the 
  Polyzoa 
  of 
  Caen 
  and 
  Eanville," 
  by 
  G. 
  R. 
  Vine, 
  Journ. 
  

   Northampt. 
  Nat. 
  Hist. 
  Soc. 
  vol. 
  v. 
  p. 
  10 
  (1888). 
  

  

  