﻿CYCLOSTOMATOUS 
  BRYOZOA 
  CANU 
  AND 
  BASSLER 
  

  

  17 
  

  

  Affinities.- 
  — 
  This 
  is 
  a 
  Multicrescis 
  in 
  which 
  the 
  tubes 
  have 
  neither 
  

   visors 
  nor 
  peristomes. 
  We 
  did 
  not 
  have 
  enough 
  specimens 
  to 
  pre- 
  

   pare 
  thin 
  sections. 
  

  

  The 
  species 
  differs 
  from 
  Semimulticavea 
  variolata 
  Gregory, 
  1909, 
  in 
  

   its 
  much 
  smaller 
  micrometric 
  dimensions. 
  It 
  differs 
  from 
  Heteropora 
  

   subaequiporosa 
  Gregory, 
  1909, 
  in 
  its 
  smaller 
  micrometric 
  measure- 
  

   ments 
  and 
  in 
  its 
  zoarium, 
  which 
  is 
  not 
  free. 
  

  

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

  

  Holotype.— 
  Cat. 
  No. 
  69860, 
  U.S.N.M. 
  

  

  MULTICRESCIS 
  PULCHELLA, 
  new 
  species 
  

  

  Plate 
  21, 
  figs. 
  13-18 
  

  

  Description. 
  — 
  The 
  zoarium 
  is 
  free, 
  subcylindrical, 
  branched, 
  hollow 
  

   in 
  the 
  interior. 
  The 
  orifices 
  are 
  circular, 
  oblique, 
  arranged 
  in 
  quin- 
  

  

  Fio. 
  4.— 
  Multicrescis 
  pulchella, 
  new 
  species. 
  A. 
  Transverse 
  section, 
  X 
  1G, 
  of 
  a 
  hollow 
  zoarium. 
  The 
  ex- 
  

   ternal 
  lamella 
  seems 
  to 
  have 
  had 
  only 
  one 
  tube 
  of 
  origin. 
  B. 
  Longitudinal 
  section 
  through 
  the 
  same 
  

   zoarium, 
  X 
  16, 
  showing 
  the 
  tube 
  of 
  origin 
  which 
  gave 
  rise 
  to 
  the 
  external 
  lamella. 
  Lower 
  Cretaceous 
  

   (Valangian): 
  Sainte-Croix, 
  Switzerland 
  

  

  cunx, 
  ornamented 
  with 
  a 
  tuberose 
  visor 
  placed 
  inferiorily. 
  The 
  meso- 
  

   pores 
  are 
  numerous, 
  polygonal, 
  smaller 
  than 
  the 
  orifices. 
  

  

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

   of 
  mesopores, 
  0.04 
  mm. 
  

  

  Structure. 
  — 
  The 
  zoarial 
  branches 
  are 
  solid 
  at 
  their 
  extremity. 
  

   When 
  the 
  visors 
  are 
  worn 
  the 
  aspect 
  of 
  the 
  surface 
  is 
  that 
  of 
  an 
  ordi- 
  

   nary 
  Heteropora. 
  The 
  base 
  is 
  orbicular, 
  little 
  expanded, 
  garnished 
  

   with 
  a 
  concentrically 
  wrinkled 
  epitheca. 
  The 
  one 
  we 
  figure 
  is 
  not 
  

   53648—26 
  2 
  

  

  