﻿Report 
  of 
  the 
  State 
  Geologist. 
  1027 
  

  

  Norella, 
  Bittner. 
  1890. 
  

  

  Small, 
  smooth 
  rhynchonellids, 
  with 
  conspicuous 
  median]' 
  fold 
  

   and 
  sinus, 
  and 
  sloping 
  hinge-line. 
  Interior 
  unknown. 
  

  

  Figs. 
  425, 
  426.— 
  Norella 
  re 
  fractifrons, 
  Bittner. 
  (Bittner.) 
  

  

  Type, 
  Novella 
  sellaris, 
  Laube 
  (sp.). 
  

   Distribution. 
  Triassic. 
  

  

  Rhynchonellina, 
  Gemellaro. 
  1871. 
  

  

  Shells 
  transverse, 
  unequally 
  convex, 
  the 
  pedicle-valve 
  being 
  

   the 
  deeper. 
  Cardinal 
  margin 
  nearly 
  straight. 
  Beak 
  incurved, 
  

   beneath 
  it 
  lying 
  a 
  concave 
  triangular 
  area, 
  bearing 
  an 
  incipient 
  

   deltarium. 
  Crura 
  long, 
  curved 
  toward 
  the 
  pedicle- 
  valve, 
  their 
  

  

  Fig. 
  427.— 
  Rhynchonellina 
  Suessi, 
  Gemellaro. 
  (Gemellaro). 
  

  

  extremities 
  nearly 
  touching 
  that 
  valve. 
  Near 
  their 
  bases 
  these 
  

   crura 
  give 
  off 
  short 
  jugal 
  apophyses. 
  

  

  Type, 
  ^Rhynchonellina 
  Suessi, 
  Gemellaro. 
  

  

  Distribution. 
  Jurassic. 
  

  

  Dimerella, 
  Zittel. 
  1870. 
  

  

  Shells 
  small, 
  scenidiiform, 
  with 
  high 
  ventral 
  umbo 
  and 
  a 
  

   straight 
  hinge-line 
  which 
  equals 
  the 
  full 
  diameter 
  of 
  the 
  valves. 
  

   Surface 
  plicate. 
  Pedicle-passage 
  large; 
  deltidial 
  plates 
  feebly 
  

   developed. 
  Brachial 
  valve 
  with 
  an 
  elevated 
  median 
  septum 
  

  

  85 
  

  

  