﻿Report 
  of 
  the 
  State 
  Geologist. 
  919 
  

  

  Flabelliporella. 
  — 
  Forms 
  which 
  have 
  the 
  branches 
  and 
  dis- 
  

   sepiments 
  similar 
  to 
  Polypora, 
  but 
  having 
  a 
  flabellate 
  mode 
  of 
  

   growth. 
  

  

  Polypoeella. 
  — 
  Forms 
  intermediate 
  between 
  Fenestella 
  and 
  

   Polypora 
  in 
  the 
  number 
  of 
  ranges 
  of 
  cell 
  apertures. 
  

  

  Fenesteapoea. 
  — 
  Forms 
  having 
  pores 
  on 
  the 
  summit 
  of 
  the 
  

   carinae 
  and 
  conspicuous 
  pores 
  on 
  the 
  non-celluliferous 
  face 
  of 
  the 
  

   frond. 
  

  

  Retepoeella. 
  — 
  Forms 
  having 
  branches 
  connected 
  by 
  anas- 
  

   tomosis, 
  and 
  with 
  three 
  or 
  more 
  ranges 
  of 
  apertures 
  on 
  the 
  cel- 
  

   luliferous 
  face. 
  

  

  Retepoeina. 
  — 
  Forms 
  similar 
  to 
  Reteporella, 
  but 
  having 
  only 
  

   two 
  ranges 
  of 
  cell 
  apertures. 
  

  

  PTiLOPOPmA. 
  — 
  Infundibuliform 
  fronds 
  having 
  a 
  general 
  

   resemblance 
  to 
  Fenestella, 
  but 
  with 
  some 
  of 
  the 
  branches 
  

   larger 
  than 
  the 
  others, 
  the 
  ordinary 
  branches 
  proceeding 
  later- 
  

   ally 
  from 
  one 
  or 
  both 
  sides 
  of 
  the 
  larger 
  branches, 
  three 
  or 
  

   more 
  ranges 
  of 
  apertures 
  on 
  a 
  branch. 
  

  

  Ptilopoeella. 
  — 
  Infundibuliform 
  fronds 
  resembling 
  the 
  pre- 
  

   ceding, 
  but 
  having 
  only 
  two 
  ranges 
  of 
  cell 
  apertures. 
  

  

  PistnapofvIna. 
  — 
  Branches 
  and 
  dissepiments 
  similar 
  to 
  Ptilo- 
  

   porina, 
  but 
  having 
  a 
  flabellate 
  mode 
  of 
  growth. 
  

  

  Pinnapoeella. 
  — 
  Forms 
  having 
  a 
  general 
  resemblance 
  to 
  the 
  

   preceding, 
  but 
  having 
  three 
  or 
  more 
  ranges 
  of 
  cell 
  apertures. 
  

  

  Semicoscentctm. 
  — 
  Unitrypa. 
  

  

  Cyclopoeina. 
  — 
  Forms 
  having 
  prominent 
  semi 
  circular 
  projec- 
  

   tions 
  from 
  the 
  carinae 
  over 
  the 
  dissepiments, 
  the 
  opposite 
  ones 
  

   frequently 
  uniting. 
  The 
  forms 
  of 
  this 
  genus 
  have 
  been 
  placed 
  in 
  

   several 
  groups, 
  from 
  the 
  character 
  of 
  the 
  carinae. 
  The 
  groups 
  

   have 
  the 
  same 
  value 
  as 
  the 
  corresponding 
  groups 
  in 
  Fenestella. 
  

  

  Group 
  a. 
  

  

  Group 
  p. 
  

  

  Group 
  y. 
  

  

  Group 
  d. 
  

  

  Group 
  e. 
  

  

  Group 
  C. 
  

  

  