﻿art. 
  2i 
  CYCLOSTOMATOUS 
  BRYOZOA 
  CANU 
  AND 
  BASSLER 
  33 
  

  

  NEUROPORA 
  MICROPORA, 
  new 
  species 
  

  

  Plate 
  25, 
  figs. 
  4-8; 
  Plate 
  30, 
  fig. 
  20 
  

  

  Description. 
  — 
  The 
  zoarium 
  is 
  free, 
  hemispherical 
  or 
  pyriform; 
  the 
  

   base 
  is 
  always 
  narrower. 
  The 
  orifices 
  are 
  very 
  small, 
  polygonal, 
  

   irregular, 
  surrounded 
  by 
  short 
  points. 
  The 
  veinules 
  arc 
  rare 
  and 
  

   irregular. 
  

  

  Measurements. 
  — 
  Diameter 
  of 
  orifice, 
  0.08 
  mm.; 
  length 
  of 
  large 
  

   zoaria, 
  20 
  mm. 
  

  

  Structure. 
  — 
  This 
  species 
  is 
  very 
  well 
  characterized 
  by 
  the 
  smal 
  

   diameter 
  of 
  its 
  orifices. 
  

  

  The 
  longitudinal 
  section 
  is 
  quite 
  identical 
  with 
  that 
  of 
  the 
  geno- 
  

   type 
  admirably 
  figured 
  by 
  Hennig 
  in 
  1893. 
  It 
  is 
  quite 
  complicated 
  

   by 
  the 
  very 
  large 
  number 
  of 
  diaphragms. 
  A 
  certain 
  number 
  of 
  the 
  

   latter 
  are 
  simultaneous 
  and 
  form 
  a 
  kind 
  of 
  zonal 
  line. 
  The 
  walls 
  

   are 
  thick 
  and 
  formed 
  by 
  a 
  very 
  finely 
  vesicular 
  tissue. 
  Gemmation 
  

   is 
  peripheral. 
  

  

  In 
  tangential 
  sections 
  the 
  tubes 
  are 
  polygonal, 
  not 
  adjacent, 
  sepa- 
  

   rated 
  by 
  a 
  vesicular 
  tissue. 
  A 
  second 
  orbicular 
  tube 
  is 
  placed 
  in 
  

   their 
  interior. 
  

  

  Occurrence. 
  — 
  Lower 
  Cretaceous 
  (Aptian) 
  : 
  Faringdon, 
  England. 
  

  

  Coty 
  pes. 
  —C 
  fit. 
  No. 
  G9877, 
  U.S.N.M. 
  

  

  NEUROPORA 
  TENUINERVOSA, 
  new 
  species 
  

  

  Plate 
  25, 
  figs. 
  16-19 
  

  

  Description. 
  — 
  The 
  zoarium 
  is 
  free, 
  cylindrical, 
  branched, 
  borne 
  on 
  

   a 
  base 
  of 
  less 
  diameter. 
  The 
  orifices 
  are 
  small, 
  polygonal, 
  arranged 
  

   in 
  quincunx, 
  separated 
  by 
  little 
  salient 
  tuberosities. 
  The 
  centers 
  of 
  

   convergence 
  of 
  the 
  veinules 
  are 
  large 
  smooth, 
  salient 
  tuberosities. 
  

   The 
  veinules 
  are 
  numerous, 
  very 
  narrow, 
  often 
  little 
  visible, 
  arranged 
  

   in 
  radiating 
  lines 
  around 
  the 
  zoarial 
  tuberosities. 
  

  

  Measurements. 
  — 
  Diameter 
  of 
  orifices, 
  0.06-0.08 
  mm.; 
  diameter 
  of 
  

   zoarium, 
  5 
  mm. 
  

  

  Affinities. 
  — 
  Neuropora 
  tenuinervosa 
  differs 
  from 
  N. 
  micropora 
  in 
  its 
  

   branched 
  zoarium 
  and 
  in 
  the 
  presence 
  of 
  salient 
  centers 
  of 
  convergence. 
  

   It 
  differs 
  from 
  Neuropora 
  arbuscula 
  in 
  its 
  smaller 
  orifices, 
  in 
  its 
  less 
  

   salient 
  visors, 
  and 
  in 
  the 
  presence 
  of 
  salient 
  centers 
  of 
  convergence 
  

   of 
  the 
  veinules. 
  

  

  The 
  veinules 
  are 
  very 
  narrow, 
  quite 
  transitory, 
  as 
  they 
  disappear 
  

   upon 
  weathering, 
  so 
  that 
  certain 
  specimens 
  lack 
  them 
  entirely, 
  thus 
  

   exhibiting 
  the 
  aspect 
  of 
  Spinopora. 
  

  

  Occurrence. 
  — 
  Lower 
  Cretaceous 
  (Aptian) 
  : 
  Faringdon, 
  England 
  

   (rare) 
  . 
  

  

  Coty 
  pes. 
  —Cut. 
  No. 
  69878, 
  U.S.N.M. 
  

   53648—26 
  3 
  

  

  