﻿CYCLOSTOMATOUS 
  BRYOZOA 
  CANU 
  AND 
  BASSLER 
  

  

  65 
  

  

  be 
  salient 
  or 
  not 
  (fig. 
  4), 
  in 
  transverse 
  regular 
  rows 
  (fig. 
  4), 
  irregular 
  

   (fig. 
  5), 
  or 
  oblique 
  (fig. 
  6). 
  On 
  the 
  exterior 
  lamellae 
  the 
  peri- 
  

   stomes 
  are 
  arranged 
  in 
  quincunx 
  (figs. 
  7, 
  8). 
  The 
  facettes 
  are 
  

   visible 
  only 
  on 
  the 
  specimens 
  

   with 
  little 
  salient 
  peristomes 
  

   (figs. 
  4, 
  7). 
  On 
  the 
  basal 
  lamel- 
  

   lae 
  the 
  peristomes 
  are 
  little 
  sali- 
  

   ent 
  and 
  almost 
  orbicular 
  (fig. 
  

   10). 
  The 
  incru 
  sting 
  exterior 
  

   lamellae 
  are 
  enveloping 
  subcolo- 
  

   nies 
  of 
  reenforcement. 
  

  

  The 
  longitudinal 
  section 
  

   shows 
  a 
  central 
  bundle 
  of 
  very 
  

   long 
  cylindrical 
  tubes 
  emitting 
  

   laterally 
  by 
  dorsal 
  gemmation, 
  

   short 
  tubes 
  narrowed 
  at 
  the 
  base 
  

   but 
  much 
  expanded 
  in 
  their 
  re- 
  

   curved 
  terminal 
  part. 
  

  

  In 
  transverse 
  section 
  the 
  cen- 
  

   tral 
  bundle 
  is 
  formed 
  by 
  several 
  

   large 
  tubes 
  around 
  which 
  are 
  

   smaller 
  tubes 
  representing 
  the 
  

   base 
  of 
  the 
  tubes 
  with 
  facettes. 
  

  

  The 
  opercula 
  are 
  very 
  rare. 
  

   We 
  have 
  observed 
  some 
  cases 
  of 
  

   regeneration. 
  

  

  Affinities. 
  — 
  This 
  species 
  re- 
  

   sembles 
  greatly 
  Meliceritites 
  for- 
  

   icula 
  D'Orbigny, 
  1853, 
  of 
  the 
  

   French 
  Turonian. 
  It 
  differs 
  in 
  

   the 
  transverse 
  aperture 
  and 
  in 
  

   the 
  transverse 
  and 
  not 
  elongated 
  

   ovicell. 
  

  

  Occurrence. 
  — 
  Lower 
  Creta- 
  

   ceous 
  (Aptian) 
  : 
  Faringdon, 
  Eng- 
  

   land 
  (very 
  common) 
  . 
  

  

  Cotypes.— 
  Cat. 
  No. 
  69916, 
  

   U.S.N.M. 
  

  

  Fig. 
  33. 
  — 
  Meliceritites 
  transversa, 
  new 
  species 
  

   A. 
  Transverse 
  section, 
  X 
  16, 
  made 
  between 
  the 
  

   orifices. 
  The 
  peristomes 
  were 
  in 
  transverse 
  some- 
  

   what 
  oblique 
  rows 
  which 
  causes 
  the 
  helicoidal 
  

   arrangement 
  of 
  the 
  peripheral 
  tubes. 
  B. 
  Trans- 
  

   verse 
  section, 
  X 
  16, 
  cutting 
  some 
  orifices. 
  C. 
  Lon- 
  

   gitudinal 
  section, 
  X 
  16. 
  The 
  clear 
  tubes 
  are 
  cut 
  

   along 
  the 
  median 
  axis 
  while 
  the 
  shaded 
  ones 
  are 
  

   cut 
  tangentially 
  to 
  their 
  walls, 
  this 
  arrangement 
  

   resulting 
  from 
  the 
  disposition 
  of 
  the 
  peristomes 
  in 
  

   transverse 
  rows. 
  At 
  the 
  center 
  is 
  a 
  long 
  tube 
  which 
  

   may 
  branch. 
  Lower 
  Cretaceous 
  (Aptian): 
  Faring- 
  

   don, 
  England 
  

  

  MELICERITITES 
  CUNNINGTONI 
  Gregory, 
  1899 
  

  

  Plate 
  13, 
  figs. 
  1-8 
  

   1899. 
  Nodelea 
  cunningtoni 
  Gregory, 
  Catalogue 
  of 
  Cretaceous 
  Biyozoa 
  in 
  the 
  

   British 
  Museum, 
  vol. 
  1, 
  p. 
  308, 
  figs. 
  35, 
  36. 
  

  

  Variations. 
  — 
  Gregory, 
  1899, 
  gave 
  an 
  incomplete 
  description 
  of 
  this 
  

   species. 
  The 
  orifices 
  are 
  transverse; 
  the 
  peristomes 
  are 
  thin, 
  adja- 
  

  

  