﻿34 
  PROCEEDINGS 
  OP 
  THE 
  NATIONAL 
  MUSEUM 
  vol.67 
  

  

  Genus 
  NEUROPORELLA 
  Hennig, 
  1894 
  

  

  1894. 
  Neuroporella 
  Hennig, 
  Studies 
  ofver 
  Bryozoerna; 
  Sveriges 
  Kritsystem. 
  

   II 
  Cyclostomata 
  Lunds 
  Universitets 
  Arsskrift, 
  vol. 
  30, 
  No. 
  8, 
  p. 
  26. 
  

  

  The 
  zoarium 
  is 
  formed 
  of 
  irregular 
  incrusting, 
  uni 
  or 
  multi 
  lamellar 
  

   masses. 
  The 
  centers 
  of 
  convergence 
  of 
  the 
  veinules 
  form 
  smooth 
  

   salient 
  points. 
  The 
  internal 
  structure 
  is 
  identical 
  with 
  that 
  of 
  

   Neuropora. 
  

  

  Genotype. 
  — 
  Neuroporella 
  ignabergensis 
  Hennig, 
  1894. 
  Cretaceous. 
  

   This 
  genus 
  is 
  only 
  a 
  zoarial 
  form 
  of 
  Neuropora, 
  but 
  we 
  maintain 
  it 
  

   provisionally 
  in 
  order 
  to 
  facilitate 
  determination 
  and 
  because 
  our 
  

   sections 
  are 
  not 
  numerous 
  enough 
  for 
  a 
  more 
  detailed 
  study. 
  

  

  NEUROPORELLA 
  HEMISPHERICA, 
  new 
  species 
  

  

  Plate 
  26, 
  figs. 
  1-5; 
  Plate 
  31, 
  figs. 
  5, 
  6 
  

  

  Description. 
  — 
  The 
  zoarium 
  is 
  massive, 
  hemispherical, 
  with 
  a 
  con- 
  

   cave 
  and 
  somewhat 
  narrower 
  base; 
  it 
  is 
  formed 
  of 
  many 
  superposed 
  

   lamellae. 
  The 
  orifices 
  are 
  polygonal, 
  separated 
  by 
  small 
  salient 
  

   tubercules. 
  The 
  veinules 
  are 
  broad, 
  sailient, 
  smooth, 
  and 
  bifurcated. 
  

  

  Measurements. 
  — 
  Diameter 
  of 
  orifice, 
  0.12-0.16 
  mm.; 
  diameter 
  of 
  

   large 
  zoarium, 
  17 
  mm. 
  

  

  Affinities. 
  — 
  This 
  species 
  differs 
  from 
  Neuroporella 
  ignabergensis 
  

   Hennig 
  1894, 
  in 
  the 
  absence 
  of 
  centers 
  of 
  convergence 
  of 
  the 
  very 
  

   salient 
  veinules 
  and 
  in 
  its 
  much 
  larger 
  orifices. 
  

  

  In 
  longitudinal 
  sections 
  the 
  tubes 
  are 
  cylindrical 
  with 
  peripheral 
  

   gemmation, 
  traversed 
  by 
  numerous 
  diaphragms. 
  A 
  large 
  number 
  of 
  

   the 
  diaphragms 
  are 
  formed 
  simultaneously 
  and 
  form 
  the 
  zonal 
  lines. 
  

  

  In 
  tangential 
  sections 
  the 
  tubes 
  are 
  polygonal 
  and 
  their 
  walls 
  are 
  

   very 
  thick 
  and 
  opaque. 
  

  

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

   (rare) 
  . 
  

  

  Cotypes.— 
  Cut. 
  No. 
  69879, 
  U.S.N.M. 
  

  

  Genus 
  SPINOPORA 
  Blainville, 
  1830 
  

  

  The 
  zoarial 
  surface 
  bears 
  very 
  salient, 
  smooth 
  tuberosities, 
  but 
  

   veinules 
  are 
  not 
  present. 
  The 
  tubes 
  have 
  internal 
  spines. 
  The 
  

   orifices 
  and 
  the 
  internal 
  structure 
  are 
  identical 
  with 
  Neuropora. 
  

  

  Genotype. 
  — 
  Spinopora 
  (Ceriopora) 
  mitra 
  Goldfuss, 
  1827. 
  Creta- 
  

   ceous. 
  The 
  large 
  tuberosities 
  correspond 
  to 
  the 
  solidified 
  tubes 
  like 
  

   the 
  centers 
  of 
  convergence 
  in 
  Neuropora. 
  This 
  genus 
  appears 
  to 
  us, 
  

   therefore, 
  as 
  a 
  Neuroporella 
  without 
  veinules. 
  The 
  genotype 
  from 
  

   the 
  Campanian 
  of 
  Sweden 
  and 
  the 
  Island 
  of 
  Riigen 
  is 
  the 
  only 
  species 
  

   heretofore 
  known. 
  

  

  