﻿AND 
  OTHER 
  FAMILIES. 
  61 
  

  

  Unio 
  Cooperianus. 
  Plate 
  VIII. 
  fig. 
  21. 
  

  

  Testa 
  suborbiculatd, 
  nonnihil 
  obliqud, 
  inequilaterd, 
  dimidio 
  postico 
  tuberculatd 
  ; 
  

   valvulis 
  crassis 
  ; 
  natibus 
  prominentibus 
  ; 
  dentibus 
  cardinalibus 
  subgrandibus 
  ; 
  

   lateralibus 
  subbrevibus, 
  crassis 
  rectisque 
  ; 
  margariid 
  alba 
  et 
  carnis 
  colore 
  tinctd. 
  

  

  Shell 
  suborbicular, 
  somewhat 
  oblique, 
  inequilateral, 
  tuberculated 
  on 
  posterior 
  half 
  ; 
  

   valves 
  thick; 
  beaks 
  elevated 
  ; 
  cardinal 
  teeth 
  rather 
  large; 
  lateral 
  teeth 
  rather 
  short, 
  

   thick 
  and 
  straight 
  ; 
  nacre 
  flesh 
  coloured 
  and 
  white. 
  

  

  ■&■ 
  

  

  Hab. 
  River 
  Ohio. 
  T. 
  G. 
  Lea. 
  

  

  My 
  Cabinet. 
  

  

  Cabinet 
  of 
  Mr 
  Cooper. 
  

  

  Diam. 
  1-9, 
  Length 
  2-8, 
  Breadth 
  3-2 
  inches. 
  

  

  Shell 
  suborbicular, 
  somewhat 
  oblique, 
  inequilateral, 
  irregularly 
  

   tuberculated 
  on 
  the 
  posterior 
  half; 
  substance 
  of 
  the 
  shell 
  thick 
  ; 
  beaks 
  

   thick 
  and 
  elevated; 
  ligament 
  rather 
  short 
  and 
  thick; 
  epidermis 
  wrin- 
  

   kled, 
  dark 
  rusty 
  brown 
  ; 
  rays 
  scarcely 
  visible 
  ; 
  cardinal 
  tooth 
  rather 
  

   large 
  and 
  widely 
  cleft 
  in 
  the 
  left 
  valve, 
  single 
  and 
  emerging 
  from 
  a 
  

   pit 
  in 
  the 
  right 
  valve 
  ; 
  lateral 
  teeth 
  rather 
  short, 
  thick 
  and 
  straight 
  ; 
  

   anterior 
  and 
  posterior 
  cicatrices 
  both 
  distinct 
  ; 
  dorsal 
  cicatrices 
  situated 
  

   on 
  the 
  under 
  part 
  of 
  the 
  cardinal 
  tooth 
  ; 
  cavity 
  of 
  the 
  beaks 
  deep 
  and 
  

   angulated 
  ; 
  nacre 
  flesh 
  coloured 
  and 
  white, 
  the 
  white 
  usually 
  forming 
  

   a 
  broad 
  border 
  between 
  the 
  palleal 
  cicatrix 
  and 
  the 
  margin. 
  

  

  Remarks. 
  — 
  This 
  species 
  very 
  closely 
  resembles, 
  in 
  most 
  of 
  its 
  char- 
  

   acters, 
  both 
  the 
  verrucosus 
  (Barnes) 
  and 
  pustulosus 
  (nobis). 
  It 
  diners 
  

   from 
  the 
  first 
  in 
  never 
  being 
  chocolate 
  coloured. 
  It 
  is 
  rarely, 
  I 
  believe, 
  

   entirely 
  white 
  like 
  the 
  latter. 
  The 
  epidermis 
  is 
  dark, 
  and 
  when 
  rays 
  

   can 
  be 
  seen 
  on 
  it, 
  they 
  will 
  be 
  found 
  to 
  be 
  pencilled, 
  and 
  not 
  one 
  broad 
  

  

  this 
  I 
  found 
  a 
  character 
  not 
  perceptible 
  in 
  the 
  eroded 
  one 
  from 
  which 
  the 
  description 
  was 
  

   made, 
  the 
  beaks 
  being 
  furnished 
  with 
  radiated 
  folds 
  nearly 
  similar 
  to 
  those 
  of 
  the 
  lacteolus 
  

   and 
  Burroughianus 
  described 
  herein. 
  This 
  character 
  seems 
  to 
  prevail 
  very 
  much 
  in 
  the 
  

   South 
  American 
  Uniones. 
  Among 
  the 
  numerous 
  species 
  described 
  from 
  North 
  America, 
  none 
  

   yet 
  have 
  been 
  observed 
  to 
  possess 
  this 
  character. 
  

   VOL. 
  V. 
  Q 
  

  

  