﻿958 
  Forty-seventh 
  Report 
  on 
  the 
  State 
  Museum. 
  

  

  crowded, 
  at 
  others 
  distant 
  and 
  lamellose 
  ; 
  occasionally 
  the 
  surface 
  

   is 
  coarsely 
  papillose. 
  Shell 
  substance 
  strongly 
  punctate. 
  

  

  Type, 
  Cyrtina 
  heteroclita, 
  Defrance. 
  Middle 
  Devonian. 
  

  

  Distribution. 
  Silurian 
  — 
  Lower 
  Carboniferous. 
  

  

  Bittnerula, 
  gen. 
  nov. 
  

   Shells 
  small, 
  cyrtinif 
  orm 
  ; 
  exterior 
  smooth, 
  substance 
  highly 
  

   punctate. 
  Umbo 
  of 
  the 
  pedicle-valve 
  deformed 
  or 
  cicatrized, 
  

   evincing 
  attachment 
  in 
  early 
  growth 
  stages. 
  Interior 
  of 
  the 
  

   pedicle- 
  valve 
  with 
  a 
  short 
  median 
  septum, 
  attached 
  to 
  the 
  valve 
  

   for 
  one-fourth 
  the 
  length 
  of 
  the 
  latter, 
  becoming 
  free 
  and 
  

  

  Figs. 
  288-292. 
  Bittnerula 
  Zitteli, 
  Bittner 
  (sp.). 
  (Bittner.) 
  

  

  elevated 
  toward 
  its 
  anterior 
  extremity. 
  This 
  septum 
  rises 
  

   almost 
  to 
  the 
  delthyrium 
  where 
  it 
  joins 
  two 
  greatly 
  abbreviated 
  

   dental 
  plates 
  which 
  thus 
  form 
  a 
  transverse 
  platform 
  beneath 
  

   the 
  deltarium. 
  

  

  Type, 
  Bittnerula 
  Zitteli, 
  Bittner 
  (sp.) 
  

  

  Distribution. 
  Trias. 
  

  

  Spiriferina, 
  D'Orbigny. 
  1847. 
  

   (Plate 
  81, 
  figs. 
  1-7.) 
  

  

  Shells 
  resembling 
  Spirifer 
  in 
  external 
  aspect; 
  interiorly 
  the 
  

   pedicle-valve 
  bears 
  a 
  median 
  septum 
  resting 
  upon 
  the 
  bottom 
  of 
  

  

  Fig. 
  293, 
  The 
  jugum 
  of 
  Spiriferina 
  Kentuckiensis, 
  Shumard. 
  

  

  the 
  valve, 
  its 
  posterior 
  portion 
  lying 
  between, 
  but 
  not 
  united 
  

   with 
  the 
  strong 
  dental 
  lamellae. 
  The 
  process 
  on 
  the 
  primary 
  

  

  16 
  

  

  