﻿AND 
  OTHER 
  FAMILIES. 
  41 
  

  

  Diam. 
  1-2, 
  Length 
  2, 
  Breadth 
  3-2 
  inches. 
  

  

  Shell 
  elliptical, 
  transverse, 
  inequilateral, 
  somewhat 
  inflated 
  ; 
  substance 
  

   of 
  the 
  shell 
  not 
  thick 
  ; 
  beaks 
  rounded, 
  having 
  short 
  radiating 
  folds 
  ; 
  

   ligament 
  rather 
  short 
  ; 
  epidermis 
  dark 
  brown 
  and 
  wrinkled 
  ; 
  cardinal 
  

   teeth 
  long, 
  oblique, 
  nearly 
  parallel 
  with 
  the 
  margin 
  and 
  double 
  in 
  both 
  

   valves 
  ; 
  lateral 
  teeth 
  long, 
  slightly 
  curved 
  and 
  separated 
  from 
  the 
  car- 
  

   dinal 
  teeth 
  by 
  the 
  absence 
  of 
  a 
  plate 
  ; 
  anterior 
  and 
  posterior 
  cicatrices 
  

   both 
  confluent 
  ; 
  dorsal 
  cicatrices 
  situated 
  across 
  the 
  cavity 
  of 
  the 
  beaks 
  ; 
  

   cavity 
  of 
  the 
  beaks 
  rounded 
  and 
  not 
  deep 
  ; 
  nacre 
  very 
  pearly, 
  milk 
  

   white, 
  iridescent 
  behind. 
  

  

  Remarks. 
  — 
  I 
  am 
  indebted 
  to 
  the 
  kindness 
  of 
  Dr 
  Ward 
  of 
  Salem, 
  for 
  

   a 
  perfect 
  specimen 
  of 
  this 
  species. 
  In 
  outline 
  it 
  approaches 
  the 
  

   U. 
  marginalis 
  (Lam.), 
  but 
  is 
  less 
  transverse. 
  In 
  the 
  characters 
  of 
  

   its 
  teeth 
  it 
  closely 
  resembles 
  that 
  species. 
  It 
  differs 
  from 
  it 
  in 
  being 
  

   more 
  inflated, 
  more 
  wrinkled 
  and 
  in 
  having 
  a 
  thicker 
  nacre. 
  In 
  the 
  

   possession 
  of 
  radiated 
  folds 
  on 
  the 
  beaks 
  it 
  diners 
  altogether. 
  

  

  On 
  the 
  base 
  of 
  the 
  cardinal 
  tooth, 
  near 
  to 
  the 
  great 
  cicatrix, 
  there 
  is 
  

   a 
  small 
  deeply 
  impressed 
  cicatrix, 
  resembling 
  in 
  its 
  characters 
  that 
  of 
  

   the 
  Hyria 
  avicularis 
  (Lam.), 
  mentioned 
  at 
  page 
  67, 
  Vol. 
  IV. 
  

  

  The 
  specimen 
  here 
  figured 
  belongs 
  to 
  the 
  fine 
  cabinet 
  of 
  Mr 
  Hyde. 
  

  

  Symphynota 
  globosa. 
  Plate 
  IV. 
  fig. 
  12. 
  

  

  Testa 
  valde 
  globosa, 
  insequilaterali, 
  pellucidd 
  ; 
  valvulis 
  tenuiculis, 
  natibus 
  ro- 
  

   tundissimis, 
  incurvis 
  ; 
  epidermide 
  luted, 
  Isevissimd 
  ; 
  dentibus 
  cardinalibus 
  lami- 
  

   natis, 
  lateralibus 
  elevatis 
  et 
  laminatis 
  ; 
  margaritd 
  alba 
  et 
  iridescente. 
  

  

  Shell 
  very 
  globose, 
  inequilateral, 
  translucent 
  ; 
  valves 
  rather 
  thin 
  ; 
  beaks 
  very 
  round, 
  

   incurved; 
  epidermis 
  very 
  smooth 
  and 
  pale 
  yellow; 
  cardinal 
  teeth 
  lamellar; 
  lateral 
  

   teeth 
  elevated 
  and 
  lamellar 
  ; 
  nacre 
  pearly 
  white 
  and 
  iridescent. 
  

  

  Hab. 
  River 
  Ohio, 
  150 
  miles 
  below 
  Louisville. 
  Col. 
  Long. 
  

  

  My 
  Cabinet. 
  

   Cabinet 
  of 
  the 
  Academy 
  of 
  Natural 
  Sciences 
  of 
  Philadelphia. 
  

   Cabinet 
  of 
  Peale's 
  Museum. 
  

   vol. 
  v. 
  — 
  L 
  

  

  