﻿art. 
  2i 
  CYCLOSTOMATOUS 
  BRYOZOA 
  CANTJ 
  AND 
  BASSLER 
  79 
  

  

  LEIOSOECIA 
  PROXIMA, 
  new 
  species 
  

  

  Plate 
  17, 
  figs. 
  12-15 
  

  

  Description. 
  — 
  The 
  zoarium 
  is 
  free, 
  subcylindrical, 
  bifurcated. 
  The 
  

   orifices 
  are 
  orbicular 
  or 
  subpolygonal, 
  with 
  salient 
  peristomes. 
  The 
  

   mesopores 
  are 
  polygonal, 
  smaller 
  than 
  the 
  apertures, 
  few 
  in 
  number. 
  

   The 
  ovicells 
  are 
  orbicular, 
  very 
  convex, 
  smooth. 
  

  

  Measurements. 
  — 
  Diameter 
  of 
  aperture, 
  0.10-0.12 
  mm.; 
  diameter 
  

   of 
  mesopores, 
  0.08 
  mm.; 
  diameter 
  of 
  zoarium, 
  4 
  mm. 
  

  

  Affinities. 
  — 
  In 
  its 
  exterior 
  aspect 
  this 
  species 
  is 
  very 
  close 
  to 
  Leio- 
  

   soecia 
  constanti 
  D'Orbigny, 
  1S54. 
  We 
  believe, 
  however, 
  they 
  are 
  dis- 
  

   tinct. 
  The 
  zoarium 
  is, 
  in 
  fact, 
  multilamellar, 
  as 
  the 
  longitudinal 
  and 
  

   transverse 
  sections 
  prove. 
  There 
  are 
  no 
  epithecal 
  lines. 
  Finally, 
  in 
  

   spite 
  of 
  irregularity 
  of 
  the 
  specimens, 
  the 
  gemmation 
  is 
  peripheral 
  

   but 
  more 
  axial 
  and 
  the 
  central 
  bundle 
  of 
  tubes 
  is 
  smaller. 
  

  

  Our 
  longitudinal 
  section 
  is 
  very 
  interesting, 
  as 
  it 
  shows 
  the 
  begin- 
  

   ning 
  of 
  the 
  exterior 
  lamella. 
  This 
  is 
  a 
  tube 
  which 
  is 
  prolonged 
  on 
  

   the 
  surface 
  of 
  the 
  primitive 
  trunk 
  which 
  in 
  turn 
  is 
  covered 
  by 
  the 
  

   proliferation 
  of 
  its 
  successive 
  ramifications 
  by 
  dorsal 
  gemmation. 
  

   The 
  phenomenon 
  is 
  then 
  absolutely 
  identical 
  with 
  that 
  of 
  lamellate 
  

   Reptomvlticrcscis 
  forms. 
  It 
  is 
  thus 
  proved 
  that 
  in 
  such 
  zoarial 
  forms 
  

   as 
  Heteropora, 
  Reptomnlticrescis 
  , 
  and 
  Reptomulticava 
  there 
  are 
  two 
  

   kinds 
  of 
  gemmation, 
  dorsal 
  and 
  peripheral. 
  

  

  Occurrence. 
  — 
  Lower 
  Cretaceous 
  (Valangian) 
  : 
  Sainte-Croix, 
  Swit- 
  

   zerland 
  (rare). 
  

  

  Cotypes.— 
  Cat. 
  No. 
  69931, 
  U.S.N.M. 
  

  

  Family 
  CLAUSIDAE 
  D'Orbigny, 
  1854 
  

  

  Genus 
  CLAUSA 
  D'Orbigny, 
  1854 
  

  

  CLAUSA 
  CRANEI, 
  new 
  species 
  

  

  Plate 
  17, 
  figs. 
  6, 
  7 
  

  

  Description. 
  — 
  The 
  zoarium 
  is 
  free, 
  claviform. 
  The 
  peristomes 
  are 
  

   thin, 
  nonsalient, 
  arranged 
  in 
  interrupted 
  transverse 
  lines, 
  and 
  sepa- 
  

   rated 
  by 
  small 
  numerous, 
  polygonal 
  dactylethrae. 
  

  

  Measurements. 
  — 
  Diameter 
  of 
  orifice, 
  0.08 
  mm.; 
  diameter 
  of 
  peri- 
  

   stome, 
  0.10 
  mm.; 
  diameter 
  of 
  zoarium, 
  1 
  mm. 
  

  

  Affinities. 
  — 
  Only 
  the 
  type 
  specimen 
  has 
  been 
  found, 
  and 
  we 
  have 
  

   figured 
  it 
  not 
  only 
  because 
  of 
  its 
  perfect 
  preservation 
  but 
  in 
  order 
  

   to 
  show 
  that 
  the 
  genus 
  Clausa 
  appears 
  to 
  be 
  well 
  represented 
  in 
  the 
  

   Lower 
  Cretaceous, 
  where 
  it 
  has 
  hitherto 
  never 
  been 
  noted. 
  

  

  The 
  species 
  differs 
  from 
  Clausa 
  zonifera, 
  new 
  species, 
  in 
  its 
  peri- 
  

   stomes 
  not 
  grouped 
  in 
  zones 
  and 
  in 
  its 
  smaller 
  orifices. 
  The 
  specific 
  

   name 
  is 
  in 
  honor 
  of 
  W. 
  E. 
  Crane, 
  who 
  collected 
  the 
  fine 
  bryozoan 
  

   fauna 
  here 
  described 
  from 
  Faringdon. 
  

   53648—26 
  6 
  

  

  