﻿abt.su 
  CYCLOSTOMATOUS 
  BRYOZOA 
  CANU 
  AND 
  BASSLER 
  75 
  

  

  the 
  small 
  tubes 
  is 
  quite 
  considerable. 
  According 
  to 
  these 
  two 
  latter 
  

   observations, 
  it 
  might 
  be 
  concluded 
  that 
  the 
  dimorphism 
  observed 
  in 
  

   Diplocava 
  is 
  more 
  apparent 
  than 
  real 
  and 
  that 
  it 
  occurs 
  only 
  at 
  the 
  

   terminal 
  part 
  of 
  the 
  tubes. 
  

  

  Affinities. 
  — 
  This 
  species 
  differs 
  from 
  Diplocava 
  incondita 
  in 
  its 
  non- 
  

   arborescent 
  zoarium, 
  its 
  smaller 
  micromctric 
  dimensions, 
  and 
  in 
  its 
  

   less 
  apparent 
  dimorphism. 
  

  

  Occurrence. 
  — 
  Lower 
  Cretaceous 
  (Valangian): 
  Sainte-Croix 
  (Vaud), 
  

   Switzerland 
  (very 
  rare) 
  . 
  

  

  Cotype.— 
  Cat. 
  No. 
  69928, 
  U.S.N.M. 
  

  

  Cenus 
  SPIROCLAUSA 
  D'Orbigny, 
  1852 
  

  

  SPIROCLAUSA 
  NEOCOMIENSIS 
  De 
  Loriol, 
  1863 
  

  

  Plate 
  11, 
  fig. 
  14 
  

  

  1863. 
  Spiroclausa 
  neocomiensis 
  De 
  Loriol, 
  Les 
  Invert6br6s 
  du 
  Neocomien 
  in- 
  

   fe>ieur 
  du 
  Mont 
  Saleve 
  pres 
  Geneve, 
  p. 
  137, 
  pi. 
  17, 
  fig. 
  5. 
  

  

  Our 
  figured 
  specimen 
  does 
  not 
  much 
  resemble 
  that 
  of 
  De 
  Loriol, 
  

   but 
  not 
  being 
  able 
  to 
  make 
  sections, 
  we 
  do 
  not 
  believe 
  we 
  ought 
  to 
  

   create 
  a 
  new 
  species 
  for 
  it. 
  

  

  Its 
  relationships 
  seem 
  to 
  us 
  to 
  be 
  with 
  the 
  Diplocava, 
  for 
  the 
  supe- 
  

   rior 
  tubes 
  of 
  the 
  spires 
  are 
  much 
  larger 
  than 
  the 
  others. 
  In 
  each 
  

   spire 
  there 
  is 
  always 
  one 
  or 
  more 
  circles 
  of 
  inclosed 
  zooecia. 
  

  

  Occurrence. 
  — 
  Lower 
  Cretaceous 
  (Valangian): 
  Sainte-Croix 
  (Vaud), 
  

   Switzerland. 
  

  

  Plesiotype.— 
  Cat. 
  No. 
  69929, 
  U.S.N.M. 
  

  

  Family 
  LEIOSOECIIDAE 
  Canu 
  and 
  Bassler, 
  1920 
  

  

  Genus 
  LEIOSOECIA 
  Canu 
  and 
  Bassler, 
  1920 
  

  

  LEIOSOECIA 
  AEQUIPOROSA, 
  new 
  species 
  

  

  Plate 
  16, 
  figs. 
  15-18 
  

  

  Description. 
  — 
  The 
  zoarium 
  is 
  free, 
  cylindrical. 
  The 
  orifices 
  are 
  

   suborbicular 
  and 
  slightly 
  polygonal; 
  the 
  peristomes 
  are 
  thick, 
  non- 
  

   salient, 
  arranged 
  in 
  quincunx. 
  The 
  mesopores 
  are 
  little 
  numerous, 
  

   irregular, 
  polygonal, 
  equal 
  to 
  the 
  apertures. 
  The 
  ovicell 
  is 
  large, 
  

   orbicular 
  or 
  somewhat 
  elliptical, 
  thin, 
  very 
  convex. 
  

  

  Measurements. 
  — 
  Diameter 
  of 
  orifices, 
  0.10 
  mm.; 
  diameter 
  of 
  meso- 
  

   pores, 
  0.08-0.10 
  mm.; 
  diameter 
  of 
  zoarium, 
  2.5 
  mm. 
  

  

  Structure. 
  — 
  In 
  longitudinal 
  section 
  the 
  tubes 
  are 
  cylindrical. 
  The 
  

   mesopores 
  are 
  rare, 
  rather 
  long, 
  with 
  thickened, 
  hollow 
  or 
  moniliform 
  

   walls. 
  

  

  