﻿The 
  Fauna 
  of 
  the 
  Niagara 
  Group. 
  165 
  

  

  RHTNCHOlSrELLA 
  StRICKLANDII 
  % 
  (SOWEKBY). 
  

   Plate 
  26, 
  Figs. 
  84-40. 
  

  

  Terebratula 
  Stricklandi 
  J. 
  deC. 
  Sow. 
  Sil. 
  Syst., 
  pi. 
  13, 
  fig 
  19. 
  1839. 
  

  

  Terebratula 
  crispata 
  Id., 
  pi. 
  12, 
  fig 
  11. 
  1839. 
  

  

  Terebratula 
  Stricklandi 
  Da 
  v. 
  Bull. 
  Soc. 
  Geol. 
  France, 
  2d 
  Ser., 
  vol. 
  5, 
  p. 
  329. 
  1848. 
  

  

  Hypothyris 
  Stricklandi 
  d'Orbigny. 
  Podrome, 
  vol. 
  i, 
  p. 
  37. 
  1849. 
  

  

  Hypothyris 
  Stricklandi 
  McCoy. 
  Brit. 
  Pal. 
  Foss., 
  p. 
  206. 
  1855. 
  

  

  Rhynchonella 
  Stricklandi 
  Morris. 
  Catalogue 
  of 
  British 
  Fossils, 
  p. 
  146. 
  1854. 
  

  

  Rhynchonella 
  Stricklandi 
  Salter. 
  Siluria, 
  2d 
  ed 
  ; 
  pp. 
  250, 
  544, 
  pi. 
  22, 
  fig. 
  11. 
  1859. 
  

  

  Bhynchonella 
  Stricklandi 
  Lindstrom. 
  Of 
  v. 
  K. 
  Vet. 
  Akad. 
  Forhaudl., 
  p 
  . 
  366. 
  1860. 
  

  

  Compare 
  Rhynchonella 
  Tennesseensis 
  Roemer. 
  Sil. 
  Faun. 
  West]. 
  Teun., 
  p. 
  72, 
  pi. 
  

   5, 
  fig. 
  14. 
  i860. 
  Hall. 
  Trans. 
  Alb. 
  Inst., 
  vol. 
  iv, 
  p. 
  228. 
  Abstract, 
  p. 
  34; 
  May, 
  

   1863. 
  Hall. 
  Doc. 
  Edit, 
  28th 
  Rep. 
  St. 
  Mus. 
  Nat. 
  Hist., 
  pi. 
  26, 
  figs. 
  34-40. 
  1876. 
  

  

  The 
  individuals 
  belonging 
  to 
  this 
  species 
  were 
  originally 
  

   identified 
  with 
  M. 
  Tennesseensis 
  Roemer, 
  a 
  species 
  described 
  

   from 
  the 
  middle 
  Silurian 
  of 
  Tennessee. 
  The 
  specimens 
  from 
  

   Waldron, 
  in 
  their 
  prevailing 
  forms, 
  are 
  much 
  larger 
  than 
  the 
  

   figures 
  of 
  Dr. 
  Roemer, 
  and 
  the 
  plications 
  less 
  angular 
  than 
  

   represented. 
  The 
  species 
  now 
  under 
  consideration 
  occurs 
  in 
  

   Tennessee, 
  but 
  is 
  always 
  smaller, 
  and 
  in 
  that 
  respect 
  corre- 
  

   sponds 
  with 
  the 
  figures 
  cited 
  above. 
  There 
  is, 
  however, 
  another 
  

   form, 
  occurring 
  with 
  those 
  of 
  the 
  Tennessee 
  locality, 
  which 
  

   is 
  shorter 
  and 
  comparatively 
  broader, 
  with 
  more 
  angular 
  pli- 
  

   cations 
  and 
  abrupt 
  thread-like 
  transverse 
  striae, 
  a 
  more 
  abrupt 
  

   sinus 
  and 
  more 
  acute 
  beak. 
  This 
  form 
  corresponds 
  with 
  the 
  

   figures 
  of 
  Dr. 
  Roemer, 
  but 
  it 
  is 
  quite 
  unlike 
  the 
  specimens 
  

   from 
  Waldron. 
  

  

  A 
  comparison 
  of 
  the 
  Waldron 
  specimens, 
  and 
  of 
  the 
  similar 
  

   Tennessee 
  form, 
  with 
  the 
  figures 
  of 
  Mr. 
  Davidson 
  in 
  his 
  mon- 
  

   ograph 
  of 
  the 
  Fossil 
  Brachiopoda 
  of 
  Great 
  Britain, 
  indicates 
  

   the 
  specific 
  identity 
  of 
  the 
  specimens 
  from 
  these 
  three 
  locali- 
  

   ties. 
  The 
  Waldron 
  specimens 
  differ 
  from 
  those 
  of 
  Dudley, 
  

   England, 
  in 
  being 
  less 
  gibbous, 
  proportionally 
  longer, 
  the 
  

   beak 
  slightly 
  more 
  extended, 
  the 
  ventral 
  valve 
  nearly 
  flat 
  in 
  

   a 
  transverse 
  direction 
  across 
  the 
  upper 
  half 
  of 
  the 
  shell, 
  the 
  

   plications 
  larger 
  and 
  more 
  rounded, 
  the 
  sinus 
  wider 
  and 
  less 
  

   abrupt. 
  The 
  same 
  diflerences 
  are 
  observed 
  in 
  comparison 
  with 
  

   the 
  original 
  figures 
  of 
  Sowerby 
  (cited 
  above,) 
  in 
  the 
  Silurian 
  

   System. 
  In 
  both 
  the 
  works 
  cited, 
  however, 
  the 
  figures 
  agree 
  

   much 
  more 
  nearly 
  with 
  the 
  Waldron 
  specimens 
  than 
  those 
  

   of 
  Dr. 
  Roemer. 
  

  

  