﻿G4 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol. 
  67 
  

  

  Family 
  ELEIDAE 
  D'Orbigny, 
  1852 
  

  

  Genus 
  MELICERITITES 
  Roemer, 
  1840 
  

  

  MELICERITITES 
  HAIMEANA 
  D'Orbigny, 
  1853 
  

  

  Plate 
  13, 
  figs. 
  18-20 
  

  

  1853. 
  Entalophora 
  haimeana 
  D'Orbigny, 
  Pal^ontologie 
  frangaise, 
  Terrain 
  Cretac6, 
  

  

  vol. 
  5, 
  pi. 
  617, 
  figs. 
  11-14. 
  

   1853. 
  Meliceritites 
  haimeana 
  D'Orbigny, 
  Paldontologie 
  francaise, 
  Terrain 
  Cretace, 
  

  

  vol. 
  5, 
  p. 
  618. 
  

   1889. 
  Meliceritites 
  haimeana 
  Pergens, 
  Revision 
  des 
  Bryozoaires 
  du 
  Cretace 
  figures 
  

  

  par 
  D'Orbigny, 
  Memoires 
  Societe 
  Beige 
  de 
  Geologie, 
  etc., 
  vol. 
  3, 
  p. 
  399. 
  

  

  Pergens, 
  1889, 
  notes 
  that 
  the 
  specimens 
  in 
  the 
  Museum 
  of 
  Paris 
  

   seem 
  worn. 
  This 
  is 
  in 
  effect 
  the 
  habitual 
  aspect 
  of 
  this 
  species 
  and 
  

   such 
  specimens 
  are 
  in 
  reality 
  normal. 
  Those 
  which 
  we 
  have 
  found 
  at 
  

   Faringdon 
  correspond 
  very 
  well 
  with 
  D'Orbigny's 
  figure 
  and 
  descrip- 
  

   tion. 
  The 
  facettes 
  are 
  separated 
  by 
  furrows 
  and 
  not 
  by 
  salient 
  

   threads. 
  Certain 
  specimens 
  seem 
  to 
  be 
  multilamellar. 
  

  

  Measurements. 
  — 
  

  

  Aperture^ 
  = 
  - 
  06 
  mm 
  -}FacettesI 
  h 
  / 
  = 
  - 
  30 
  mm 
  " 
  

   F 
  lla 
  = 
  0.08mm. 
  J 
  llf 
  = 
  0.16 
  mm. 
  

  

  Diameter 
  of 
  branches, 
  1.20 
  mm. 
  

  

  Occurrence. 
  — 
  Lower 
  Cretaceous. 
  Albian, 
  Grandpre 
  (Ardennes), 
  

  

  France; 
  Aptian, 
  Faringdon, 
  England 
  (very 
  common). 
  

  

  Plesioty 
  pes. 
  —Cat. 
  No. 
  69915, 
  U.S.N.M. 
  

  

  MELICERITITES 
  TRANSVERSA, 
  new 
  species 
  

  

  Plate 
  12. 
  figs. 
  1-12 
  

  

  Description. 
  — 
  The 
  zoarium 
  is 
  free, 
  cylindrical, 
  ramified, 
  borne 
  on 
  a 
  

   little 
  expanded 
  base, 
  formed 
  of 
  many 
  superposed 
  lamellae. 
  On 
  the 
  

   central 
  zoarium 
  the 
  peristomes 
  are 
  salient, 
  adjacent 
  laterally, 
  and 
  

   arranged 
  in 
  close 
  transverse 
  rows; 
  the 
  facettes 
  are 
  quite 
  short 
  and 
  

   separated 
  by 
  very 
  short 
  threads. 
  The 
  aperture 
  is 
  triangular, 
  some- 
  

   what 
  transverse. 
  The 
  ovicell 
  is 
  very 
  short, 
  transverse, 
  occupying 
  all 
  

   the 
  zoarial 
  width, 
  quite 
  convex, 
  smooth; 
  the 
  oeciostome 
  is 
  a 
  little 
  

   salient 
  tube. 
  On 
  the 
  exterior 
  lamellae 
  the 
  peristomes 
  are 
  arranged 
  

   in 
  quincunx; 
  on 
  the 
  basal 
  lamella 
  they 
  are 
  little 
  salient 
  and 
  almost 
  

   orbicular. 
  

  

  Measurements. 
  — 
  

  

  Aperturej! 
  ia 
  = 
  - 
  08 
  ^Facettes^ 
  = 
  - 
  20 
  -°- 
  26 
  mm 
  " 
  

   F 
  lla=0.10mm.J 
  llf=0.16mm. 
  

  

  Diameter 
  of 
  zoaria 
  at 
  the 
  extremity, 
  1.5 
  mm.; 
  diameter 
  of 
  zoaria 
  

   at 
  the 
  base, 
  2.1 
  mm.; 
  length 
  of 
  ovicell, 
  0.64 
  mm. 
  

  

  Variations. 
  — 
  When 
  the 
  peristomes 
  are 
  very 
  salient 
  the 
  facettes 
  are 
  

   little 
  visible 
  (figs. 
  2, 
  3). 
  On 
  the 
  same 
  branch 
  the 
  peristomes 
  may 
  

  

  