﻿The 
  Fauna 
  of 
  the 
  Niagaka 
  Gtkoup. 
  113 
  

  

  apertures 
  .3 
  mm., 
  with 
  a 
  width 
  of 
  .15 
  mm., 
  arranged 
  upon 
  the 
  

   surface 
  in 
  a 
  somewhat 
  quincunx 
  order, 
  being 
  in 
  right 
  lines 
  

   longitudinally, 
  and 
  in 
  a 
  spiral 
  order 
  around 
  the 
  stipe. 
  Mar- 
  

   gins 
  of 
  apertures 
  elevated 
  and 
  strongly 
  granulose 
  ; 
  the 
  spaces 
  

   between 
  being 
  flat 
  or 
  channeled. 
  The 
  borders 
  of 
  the 
  apertures 
  

   are 
  sometimes 
  coalescent, 
  and 
  present 
  no 
  intermediate 
  groove. 
  

  

  TREMATOPORA 
  MPNTTTA. 
  

  

  Plate 
  11, 
  Fig. 
  8. 
  

  

  Trematopora? 
  (Trachypora 
  ?) 
  minuta 
  Hall. 
  Doc. 
  Edit, 
  of 
  28th 
  Rep. 
  St. 
  Mus. 
  

   Nat. 
  Hist. 
  Explanation 
  of 
  pi. 
  11, 
  fig. 
  8. 
  1876. 
  

  

  Bryozoum 
  ramose, 
  very 
  slender 
  ; 
  branches 
  frequent, 
  widely 
  

   diverging, 
  diameter 
  .5 
  mm. 
  Cell-apertures 
  elongate-oval, 
  length 
  

   about 
  .4 
  mm. 
  and 
  width 
  .2 
  mm., 
  distance 
  from 
  each 
  other 
  

   longitudinally 
  about 
  equal 
  to 
  the 
  length 
  of 
  an 
  aperture, 
  ar- 
  

   ranged 
  in 
  spiral 
  rows 
  along 
  the 
  branch. 
  Margins 
  distinctly 
  

   elevated 
  and 
  granulose, 
  and 
  separated 
  from 
  each 
  other 
  by 
  tor- 
  

   tuous 
  lines 
  of 
  nodes. 
  

  

  This 
  species 
  differs 
  from 
  T. 
  macropora* 
  by 
  its 
  more 
  elon- 
  

   gate 
  cell-apertures 
  and 
  the 
  more 
  prominent 
  granulose 
  ridges. 
  

  

  Trematopora 
  variolata. 
  

  

  Plate 
  11, 
  Figs. 
  9, 
  10. 
  

  

  Trematopora 
  variolata 
  Hall. 
  Doc. 
  Edit. 
  28th 
  Rep. 
  St. 
  Mus. 
  Nat. 
  Hist. 
  Explana- 
  

   tion 
  of 
  pi. 
  11, 
  figs. 
  9, 
  10. 
  1876. 
  

  

  Bryozoum 
  ramose, 
  hollow, 
  diameter 
  of 
  the 
  branches 
  from 
  

   1 
  to 
  1.5 
  mm. 
  Cell-apertures 
  oval, 
  margins 
  distinctly 
  elevated, 
  

   length 
  .3 
  mm., 
  width 
  .2 
  mm., 
  sometimes 
  closely 
  arranged, 
  and 
  

   in 
  other 
  cases 
  irregularly 
  scattered 
  ; 
  surface 
  with 
  numerous 
  

   maculae 
  which 
  are 
  quite 
  destitute 
  of 
  cells. 
  

  

  This 
  species 
  can 
  readily 
  be 
  distinguished 
  from 
  any 
  other 
  

   form 
  in 
  this 
  association 
  by 
  the 
  scattered 
  and 
  irregular 
  distri- 
  

   bution 
  of 
  the 
  cell-apertures 
  and 
  the 
  numerous 
  maculae 
  with- 
  

   out 
  cells. 
  

  

  * 
  T? 
  macropora 
  Hall. 
  Transactions 
  of 
  the 
  Albany 
  Institute, 
  vol. 
  x, 
  p. 
  60. 
  

  

  14 
  

  

  