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  DESCRIPTIONS 
  OF 
  NEW 
  SPECIES 
  OF 
  FOSSILS 
  

  

  FROM 
  THE 
  TRENTON 
  LIMESTONE. 
  

  

  O 
  By 
  C. 
  D. 
  WALCOTT. 
  

  

  COJSTULARIA 
  Miller 
  MS. 
  (1818). 
  

  

  CONULARIA 
  QUADRATA 
  71. 
  Sp. 
  

  

  Slender, 
  pyramidal, 
  quadrate; 
  angles 
  sulcate; 
  surface 
  marked 
  

   by 
  oblique 
  transverse 
  ridges 
  which 
  alternate 
  upon 
  opposite 
  

   sides 
  of 
  a 
  central 
  longitudinal 
  ridge; 
  the 
  transverse 
  ridges 
  

   are 
  sharp 
  near 
  the 
  apex, 
  growing 
  broader 
  at 
  the 
  mouth, 
  

   toward 
  which 
  they 
  incline; 
  each 
  side 
  is 
  slightly 
  depressed 
  

   along 
  the 
  central 
  ridge. 
  

  

  Formation 
  and 
  locality. 
  — 
  Upper 
  third 
  Trenton 
  Limestone, 
  

   Prospect 
  Bridge, 
  Oneida 
  Co., 
  N. 
  Y. 
  

  

  CONCHOPELTIS 
  Gen. 
  nov. 
  

  

  {KoyxV 
  — 
  *h 
  e 
  tt 
  > 
  rfsfoy 
  — 
  shield.) 
  

  

  Shell 
  univalve, 
  patelliform, 
  more 
  or 
  less 
  conical, 
  apex 
  cen- 
  

   tral 
  or 
  subcentral; 
  surface 
  vertically 
  striated, 
  in 
  older 
  speci- 
  

   mens 
  marked 
  by 
  concentric 
  lines 
  of 
  growth. 
  

  

  The 
  shell 
  was 
  of 
  a 
  membraneous 
  character. 
  A 
  crushed 
  

   individual 
  shows 
  two 
  sides 
  doubled 
  at 
  an 
  acute 
  angle, 
  while 
  a 
  

   split 
  extends 
  nearly 
  to 
  the 
  apex. 
  The 
  substance 
  of 
  the 
  shell 
  

   is 
  not 
  preserved 
  in 
  any 
  specimens 
  found.* 
  

  

  CONCHOPELTIS 
  ALTERNATA 
  n. 
  Sp. 
  

  

  Margin 
  undulated, 
  nearly 
  equally 
  four-lobed, 
  margin 
  of 
  

   each 
  lobe 
  slightly 
  contracted 
  at 
  the 
  center, 
  height 
  one-fifth 
  

   the 
  diameter. 
  Surface 
  marked 
  by 
  concentric 
  lines 
  of 
  growth, 
  

  

  ♦Associated 
  Lamellibranchiates, 
  and 
  Gasteropods, 
  Bellcrophon 
  bilobatus, 
  Bucania 
  }>idor 
  

   %ata 
  y 
  etc., 
  have 
  the 
  shelly 
  structure 
  preserved. 
  

  

  