﻿l62 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  tentacles 
  — 
  the 
  lophophore. 
  The 
  colony 
  is 
  commonly 
  attached 
  to 
  

   foreign 
  bodies, 
  which 
  it 
  either 
  incrusts 
  or 
  from 
  which 
  it 
  arises 
  as 
  an 
  

   independent 
  frond. 
  

  

  In 
  the 
  Paleozoic 
  genera 
  the 
  cell 
  apertures 
  are 
  often 
  surrounded 
  by 
  

   elevated 
  rims, 
  or 
  peristomes. 
  In 
  many 
  forms 
  a 
  portion 
  of 
  the 
  pos- 
  

   terior 
  wall 
  of 
  the 
  tube 
  is 
  more 
  or 
  less 
  thickened, 
  and 
  curved 
  to 
  a 
  

   shorter 
  radius, 
  often 
  projecting 
  above 
  the 
  plane 
  of 
  the 
  aperture. 
  

   This 
  forms 
  the 
  lunar 
  ia, 
  and 
  their 
  ends 
  may 
  project 
  into 
  the 
  tubes 
  as 
  

   pseudosepta. 
  In 
  the 
  interapertural 
  space 
  may 
  occur 
  angular 
  or 
  ir- 
  

   regular 
  cells, 
  the 
  mesopores, 
  while 
  on 
  many 
  portions 
  of 
  the 
  surface, 
  

   tubular 
  spines 
  (acanthopores), 
  or 
  nodes 
  (rounded, 
  knob-like 
  eleva- 
  

   tions), 
  may 
  occur. 
  At 
  intervals, 
  in 
  many 
  genera, 
  rounded 
  eleva- 
  

   tions, 
  or 
  monticules, 
  are 
  found, 
  which 
  may, 
  or 
  may 
  not, 
  be 
  destitute 
  

   of 
  cells. 
  Maculae 
  or 
  irregular 
  blotches, 
  destitute 
  of 
  cells, 
  also 
  occur 
  

   in 
  many 
  forms. 
  Some 
  species 
  bear 
  a 
  superficial 
  resemblance 
  to 
  cer- 
  

   tain 
  corals, 
  particularly 
  the 
  monticuliporoids. 
  

  

  Genus 
  diploclema 
  Ulrich 
  

  

  [Ety. 
  : 
  dtnXuu^, 
  double; 
  y^Xrifxa^ 
  twig] 
  

  

  (1890. 
  Geol. 
  sur. 
  Illinois, 
  8:368) 
  

  

  Zoarium 
  dendroid, 
  branches 
  slightly 
  compressed, 
  spreading 
  in 
  

   the 
  same 
  plane 
  ; 
  zooecia 
  tubular, 
  diverging 
  from 
  

   ; 
  1 
  ^ 
  wavy 
  mesial 
  mesotheca; 
  apertures 
  circular; 
  

   prominent.'^ 
  

  

  ,. 
  .J 
  ; 
  Diploclema 
  sparsa 
  (Hall) 
  (Fig. 
  57). 
  T 
  r 
  e 
  - 
  

  

  -I 
  matopora 
  s 
  p 
  a 
  r 
  s 
  a 
  Hall 
  (1852. 
  Pal. 
  N. 
  Y. 
  

   2:155, 
  pi. 
  40A, 
  fig. 
  I2a-d) 
  

   Distinguishing 
  characters. 
  Slender, 
  cylindric 
  

  

  '-ij 
  

  

  enT2geSeSl'"ofTrlsh''S 
  bifurcating 
  Stems; 
  distant 
  cells, 
  opening 
  ob- 
  

  

  worn 
  branches 
  , 
  . 
  , 
  . 
  . 
  - 
  . 
  . 
  

  

  liquely 
  upward; 
  elongated 
  nanform 
  cahcles.. 
  

   Found 
  abundantly 
  in 
  the 
  Rochester 
  shale 
  at 
  Lockport 
  (Hall) 
  

   probably 
  also 
  at 
  Niagara. 
  

  

  Genus 
  ceramopora 
  Hall 
  

  

  [Ety.: 
  z£>a/jio9, 
  a 
  tile; 
  -y^o?, 
  pore] 
  

  

  (1852. 
  Pal. 
  N. 
  Y. 
  2:168) 
  

  

  Zoarium 
  disk-like, 
  free 
  or 
  attached 
  by 
  the 
  center 
  of 
  the 
  base; 
  

   under 
  surface 
  with 
  one 
  or 
  more 
  layers 
  of 
  small, 
  irregular 
  cells; 
  zooe- 
  

  

  ^The 
  generic 
  descriptions 
  of 
  the 
  Bryozoa 
  are 
  adapted 
  or 
  transcribed 
  from 
  

   Nickles 
  & 
  Bassler; 
  Synopsis 
  of 
  American 
  fossil 
  Bryozoa. 
  U. 
  S. 
  geol. 
  sur. 
  

   Bui. 
  173. 
  I 
  have 
  also 
  followed 
  these 
  authors 
  in 
  the 
  synonomy 
  of 
  the 
  species. 
  

  

  