﻿Report 
  of 
  the 
  State 
  Geologist 
  959 
  

  

  lamellae 
  are 
  continuous, 
  forming 
  a 
  simple 
  transverse 
  or 
  subacute 
  

   jugum. 
  

  

  Fig. 
  294. 
  Spiriferina 
  Walcotti. 
  Sowerby; 
  showing 
  muscular 
  scars 
  on 
  walls 
  of 
  median 
  septum 
  

  

  of 
  pedicle-valve. 
  

  

  Shell 
  substance 
  strongly 
  punctate 
  throughout. 
  

   Type, 
  Spiriferina 
  rostrata, 
  Schlotheim 
  (sp.). 
  Lias. 
  

   Distribution. 
  Devonian 
  (?) 
  Jurassic. 
  

  

  Thecocyrtella, 
  Bittner. 
  1862. 
  

   Synonym 
  ; 
  Cyrtotheca, 
  Bittner, 
  1890. 
  

  

  Minute 
  shells 
  similar 
  to 
  Cyktina 
  in 
  exterior 
  and 
  interior, 
  but 
  

   attached 
  by 
  the 
  apex 
  of 
  the 
  pedicle-valve. 
  Surface 
  smooth. 
  

  

  Fios. 
  295-298. 
  — 
  Internal 
  casts 
  of 
  Thecocyrtella 
  ampezzana, 
  Bittner, 
  sp. 
  (Bittner.) 
  

  

  Type, 
  Thecocyrtella 
  ampezzana, 
  Bittner. 
  

   Distribution. 
  Trias 
  sic. 
  

  

  Suessia, 
  Deslongchamps. 
  1854. 
  

  

  Shells, 
  cyrtiniform, 
  with 
  high, 
  often 
  arched 
  cardinal 
  area; 
  

  

  deltidial 
  covering 
  absent 
  or 
  lost. 
  Surface 
  plicate, 
  with 
  median 
  fold 
  

  

  and 
  sinus 
  on 
  brachial 
  and 
  pedicle-valves 
  respectively. 
  On 
  the 
  

  

  interior 
  of 
  the 
  pedicle- 
  valve 
  are 
  two 
  small 
  dental 
  plates 
  which 
  do 
  

  

  17 
  

  

  