﻿252 
  

  

  NEW 
  YORK 
  ST'ATE 
  MUSEUM 
  

  

  margin 
  oval; 
  ventral 
  margin 
  sloping 
  inward 
  toward 
  the 
  posterior 
  

   end; 
  muscle 
  impressions 
  deep, 
  anterior 
  adductor 
  muscle 
  scar-pitted; 
  

  

  cardinal 
  teeth 
  large 
  and 
  heavy; 
  laterals 
  

   strong 
  and 
  straight 
  or 
  nearly 
  so, 
  with 
  

   deep, 
  wide 
  impressions; 
  beaks 
  large 
  and 
  

   prominent, 
  showing 
  no 
  sculpture. 
  

  

  Locality. 
  From 
  excavations 
  in 
  Pros- 
  

   pect 
  park. 
  

  

  Quadrula 
  coccinea 
  (Conrad) 
  Simpson 
  

   1900 
  (Fig. 
  190). 
  Unio 
  coccineus 
  

   Conrad 
  (1836. 
  Monograph, 
  3:29) 
  

   Quadrula 
  coccinea 
  Simpson 
  

   (1900. 
  U. 
  S. 
  nat. 
  mus. 
  Proc. 
  22:788) 
  

  

  Shell 
  quadrate, 
  oval, 
  thick 
  and 
  heavy, 
  somewhat 
  compressed 
  pos- 
  

   teriorly; 
  anterior 
  end 
  oval; 
  posterior 
  end 
  produced, 
  angulated; 
  dor- 
  

   sal 
  margin 
  oval; 
  ventral 
  margin 
  rounded 
  anteriorly, 
  produced 
  and 
  

   pointed 
  at 
  the 
  posterior 
  end; 
  the 
  anterior 
  adductor 
  muscle 
  impres- 
  

   sion 
  deep, 
  pitted 
  above, 
  triangular, 
  showing 
  radiating 
  lines; 
  pos- 
  

  

  Fig. 
  189 
  Quadrula 
  solida 
  

  

  Fig. 
  190 
  Quadrula 
  coccinea 
  

  

  terior 
  adductor 
  impression 
  somewhat 
  indistinct; 
  cardinal 
  teeth 
  large 
  

   and 
  strong, 
  double 
  in 
  each 
  valve; 
  laterals 
  strong, 
  blade-like, 
  two 
  

   in 
  the 
  left 
  valve 
  and 
  one 
  in 
  the 
  'right 
  ; 
  beaks 
  large, 
  produced, 
  show- 
  

   ing 
  no 
  sculpture, 
  and 
  widely 
  incurving; 
  dorsal 
  margin 
  excavated 
  at 
  

   the 
  umbones; 
  surface 
  marked 
  by 
  heavy, 
  regular 
  growth 
  lines, 
  re- 
  

   sembling 
  concentric 
  waves. 
  

  

  Locality. 
  Found 
  in 
  nearly 
  all 
  the 
  deposits. 
  

  

  