﻿978 
  Forty-seventh 
  Report 
  on 
  tee 
  State 
  Museum. 
  

  

  Amphitomella, 
  Bittner. 
  1890. 
  

  

  Smooth 
  shells 
  with 
  a 
  very 
  strong 
  double 
  cardinal 
  process, 
  and 
  

   a 
  median 
  septum 
  in 
  each 
  valve 
  extending 
  the 
  entire 
  length 
  of 
  

   the 
  shell 
  and 
  dividing 
  the 
  cavity 
  into 
  two 
  chambers. 
  Jugum 
  

  

  Fig. 
  323.— 
  Amphitomella 
  hemisphceroidica, 
  Klipsteln 
  (sp.). 
  (Bittner.) 
  

  

  situated 
  posteriorly 
  ; 
  saddle 
  scarcely 
  developed 
  ; 
  intercalary 
  

   lamellae 
  extending 
  for 
  nearly 
  the 
  entire 
  length 
  of 
  the 
  primary 
  

   lamellae. 
  

  

  Type, 
  Amphitomella 
  hemisphceroidica, 
  Klipstein 
  (sp.). 
  

  

  Distribution. 
  Triassic. 
  

  

  (?) 
  Pomatospirella, 
  Bittner. 
  1892. 
  

   Shells 
  small, 
  unevenly 
  convex, 
  having 
  the 
  contour 
  of 
  Dayia 
  

   and 
  Ctclospiea. 
  Hinge-line 
  straight, 
  cardinal 
  area 
  vabsent 
  

  

  Figs. 
  324-326.— 
  Pomatospirella 
  thecidium,\HittneT. 
  (Bittner.) 
  

  

  Shell 
  smooth, 
  fibrous, 
  the 
  fibres 
  converging 
  toward 
  a 
  median 
  

   line. 
  Interior 
  unknown. 
  

  

  Type, 
  Pomatospirella 
  thecidium, 
  Bittner. 
  

  

  Distribution. 
  Triassic. 
  

  

  (This 
  genus 
  is 
  insufficiently 
  characterized 
  . 
  Its 
  known 
  structure 
  does 
  not 
  

   serve 
  to 
  distinguish 
  it 
  from 
  the 
  other 
  genera 
  mentioned.) 
  

  

  36 
  

  

  