﻿1028 
  Forty-seventh 
  Report 
  on 
  the 
  State 
  Museum. 
  

  

  dividing 
  the 
  interior 
  shell 
  cavity 
  into 
  two 
  chambers. 
  Crural 
  

   processes 
  long 
  and 
  recurved. 
  Shell 
  substance 
  impunctate. 
  

  

  

  Figs. 
  428-433.— 
  Z>imereZZa 
  Giimbeli, 
  Zittel. 
  (Bittner 
  and 
  Zittel 
  ) 
  

  

  Type, 
  Dimerella 
  Giimbeli, 
  Zittel. 
  

   Distribution. 
  Triassic. 
  

  

  Cryptopora, 
  Jeffreys. 
  1869. 
  

  

  Synonyms; 
  Atretia, 
  Jeffreys, 
  1870; 
  Neatretia, 
  CEhlert, 
  1891. 
  

  

  Diminutive 
  shells 
  with 
  a 
  subtrihedral 
  contour. 
  Beak 
  promi- 
  

   nent 
  and 
  acute 
  ; 
  pedicle-passage 
  large, 
  triangular 
  and 
  without 
  

   deltidial 
  plates. 
  Interior 
  of 
  pedicle- 
  valve 
  with 
  prominent 
  dental 
  

  

  si 
  \ 
  

  

  

  Figs. 
  434-437.— 
  Cryptopora 
  gnomon, 
  Jeffreys. 
  (Davidson). 
  

  

  plates 
  ; 
  brachial 
  valve 
  with 
  a 
  short, 
  but 
  greatly 
  elevated 
  median 
  

   septum. 
  

  

  Type, 
  Cryptopora 
  gnomon, 
  Jeffreys. 
  

  

  Distribution. 
  Recent. 
  

  

  86 
  

  

  