﻿Report 
  of 
  the 
  State 
  Geologist. 
  

  

  899 
  

  

  The 
  forms 
  observed 
  have 
  three 
  ranges 
  of 
  cell 
  apertures. 
  Others 
  

   will 
  undoubtedly 
  occur 
  which 
  have 
  but 
  two 
  ranges 
  of 
  cell 
  

   apertures 
  and 
  for 
  these 
  the 
  generic 
  name 
  Pinnaporina 
  is 
  

   suggested. 
  

  

  SEMICOSCLNIUM, 
  Prout. 
  

  

  (Prout, 
  Trans. 
  Acad. 
  St. 
  Louis, 
  1858, 
  p. 
  443, 
  pi. 
  17, 
  figs. 
  1-lf.) 
  

  

  "Bryozoum, 
  a 
  leaf-like 
  expansion, 
  somewhat 
  penniform, 
  with- 
  

   out 
  a 
  shaft 
  ; 
  sole 
  formed 
  of 
  longitudinal 
  and 
  parallel 
  ridges, 
  sur- 
  

  

  44 
  

  

  /, 
  

  

  a/. 
  % 
  

  

  wmti 
  

  

  mounted 
  by 
  [a 
  cellular 
  tissue, 
  divided 
  perpendicularly 
  by 
  thin 
  

   longitudinal 
  septa, 
  corresponding 
  to 
  the 
  ridges 
  and 
  supporting 
  par- 
  

   allel 
  lines 
  of 
  moderately 
  large 
  tortuous 
  tubes, 
  alternately 
  approx- 
  

   imating 
  and 
  receding 
  from 
  each 
  other; 
  covered 
  by 
  a 
  dense 
  stony 
  

   crust, 
  divided 
  into 
  a 
  more 
  or 
  less 
  regular 
  net-work, 
  representing 
  

   irregular 
  longitudinal 
  rays 
  (obliquely 
  lateral 
  here), 
  and 
  dissepi- 
  

   ments, 
  which 
  bound 
  rhomboidal 
  or 
  oval 
  fenestrules, 
  giving 
  

   passage 
  to 
  cells 
  originating 
  in^the 
  cellular 
  tissue 
  of 
  the 
  sole, 
  and 
  

  

  