﻿954 
  Forty-seventh 
  Report 
  on 
  the 
  State 
  Museum. 
  

  

  Syringothyris, 
  Winchell. 
  1893. 
  

   (Plate 
  30, 
  figs. 
  1-11.) 
  

  

  Shells 
  spiriferoid, 
  usually 
  large, 
  with 
  erect 
  cardinal 
  area 
  and 
  

   broad, 
  multiplicate 
  lateral 
  slopes. 
  Fold 
  and 
  sinus 
  generally 
  non- 
  

   plicate. 
  In 
  the 
  pedicle-valve 
  the 
  delthyrium 
  is 
  covered 
  by 
  a 
  

   convex, 
  imperforate 
  plate, 
  which 
  is 
  frequently 
  absent. 
  The 
  

   dental 
  lamellae, 
  more 
  or 
  less 
  strongly 
  developed, 
  rest 
  on 
  the 
  bot- 
  

   tom 
  of 
  the 
  valve, 
  and 
  at 
  their 
  anterior 
  extremities 
  are 
  produced 
  

   about 
  the 
  broad 
  diductor 
  impressions. 
  They 
  are 
  united 
  beneath 
  

   the 
  deltidium 
  by 
  a 
  transverse 
  plate 
  arising 
  from 
  a 
  testaceous 
  

   callosity 
  in 
  the 
  apex 
  of 
  the 
  delthyrium. 
  This 
  plate 
  is 
  formed 
  by 
  

   the 
  deposition 
  of 
  accretions 
  to 
  the 
  margins 
  of 
  the 
  delthyrium, 
  

   which 
  unite 
  in 
  the 
  median 
  line, 
  the 
  union 
  being 
  marked 
  by 
  a 
  

   raised 
  line 
  less 
  distinct 
  on 
  the 
  upper 
  than 
  on 
  the 
  under 
  side 
  of 
  

   the 
  plate. 
  From 
  just 
  within 
  the 
  lateral 
  margins 
  and 
  on 
  the 
  

   inner 
  side 
  of 
  the 
  plate 
  two 
  processes 
  are 
  given 
  off, 
  which 
  are 
  

   curled 
  toward 
  each 
  other 
  with 
  some 
  irregularity, 
  not 
  meeting 
  

   except 
  where 
  coalesced 
  with 
  the 
  apical 
  callosity, 
  forming 
  a 
  tube 
  

   which 
  is 
  split 
  along 
  its 
  inner 
  surface. 
  This 
  tube 
  is 
  adherent 
  to 
  

   the 
  transverse 
  plate 
  as 
  far 
  as 
  the 
  latter 
  extends, 
  and 
  is 
  frequently 
  

   produced 
  beyond 
  its 
  termination. 
  

  

  Muscular 
  scars 
  as 
  in 
  Spikifek, 
  their 
  anterior 
  portion 
  being 
  

   divided 
  by 
  a 
  short 
  median 
  septum 
  which 
  is 
  an 
  extension 
  from 
  

   the 
  apical 
  calcareous 
  deposit 
  

  

  The 
  brachial 
  valve 
  is 
  spiriferoid 
  in 
  all 
  internal 
  details. 
  The 
  

   cardinal 
  process 
  is 
  broad, 
  multistriate 
  and 
  supported 
  by 
  a 
  short 
  

   median 
  thickening. 
  The 
  spirals 
  are 
  large, 
  the 
  

   primary 
  lamellae 
  bearing 
  a 
  pair 
  of 
  short, 
  dis 
  

   crete 
  spinous 
  processes 
  which 
  represent 
  the 
  

   jugum. 
  The 
  shell 
  structure 
  is 
  more 
  or 
  less 
  

   distinctly 
  and 
  abundantly 
  punctate. 
  It 
  is 
  

   probable 
  that 
  these 
  punctae 
  perforate 
  the 
  

   la^iifof 
  smnTo^wis 
  epidermal 
  layer 
  and 
  extend 
  to 
  the 
  inner 
  

   *yp 
  a 
  ' 
  lamellae 
  of 
  the 
  shell. 
  The 
  exterior 
  is 
  usually 
  

  

  covered 
  with 
  a 
  finely 
  textile 
  ornament 
  which 
  has 
  been 
  compared, 
  

   in 
  appearance, 
  to 
  " 
  twilled 
  cloth." 
  

  

  Type, 
  Syringothyris 
  typa, 
  Winchell. 
  Burlington 
  limestone. 
  

   Distribution. 
  Carboniferous. 
  

  

  12 
  

  

  