﻿AND 
  OTHER 
  FAMILIES. 
  91 
  

  

  Lamarck 
  cites 
  Schroeter 
  first. 
  I 
  have 
  not 
  an 
  opportunity 
  to 
  examine 
  

   Schroeter's 
  work. 
  

  

  Unio 
  nodulosa. 
  This 
  is 
  a 
  young 
  individual 
  of 
  the 
  ovata 
  of 
  Dono- 
  

   van, 
  and 
  no 
  doubt 
  the 
  specimen 
  cited 
  never 
  was 
  out 
  of 
  Europe. 
  The 
  

   ovata 
  is 
  emphatically 
  an 
  European 
  shell, 
  and 
  has 
  served, 
  like 
  the 
  pic- 
  

   torum, 
  to 
  which 
  it 
  has 
  some 
  resemblance, 
  to 
  make 
  numerous 
  species. 
  

   Lamarck's 
  habitat 
  (lake 
  Champlain) 
  is 
  certainly 
  an 
  error. 
  

  

  Unio 
  varicosa. 
  The 
  specimen 
  described 
  by 
  Lamarck 
  is 
  still 
  in 
  his 
  

   original 
  cabinet. 
  It 
  is 
  a 
  young 
  and 
  bad 
  specimen 
  of 
  the 
  Masmodonta 
  

   marginata 
  (Say). 
  From 
  the 
  description 
  1 
  formerly 
  supposed 
  it 
  to 
  be 
  

   Jllas. 
  undulata 
  (Say). 
  

  

  Unio 
  granosa. 
  The 
  only 
  specimen 
  of 
  this 
  beautiful 
  and 
  distinct 
  

   species 
  I 
  saw 
  in 
  Europe, 
  is 
  in 
  the 
  Garden 
  of 
  Plants. 
  It 
  is 
  unique 
  in 
  

   the 
  possession 
  of 
  disks 
  completely 
  covered 
  with 
  minute 
  granular 
  ele- 
  

   vations. 
  

  

  Unio 
  depressa. 
  The 
  specimen 
  in 
  the 
  Duke 
  de 
  Rivoli's 
  collection 
  is 
  

   marked 
  "from 
  Peru," 
  and 
  is 
  a 
  very 
  different 
  species 
  from 
  one 
  which 
  

   I 
  procured 
  in 
  Paris, 
  marked 
  by 
  Lesson 
  as 
  depressa 
  from 
  New 
  Holland. 
  

   Lamarck's 
  description 
  is 
  so 
  extremely 
  vague, 
  that 
  it 
  almost 
  equally 
  

   well 
  applies 
  to 
  both. 
  The 
  shell 
  from 
  Peru, 
  of 
  which 
  I 
  have 
  several 
  

   specimens, 
  is 
  more 
  transverse 
  than 
  that 
  from 
  New 
  Holland, 
  which 
  I 
  

   presume 
  should 
  be 
  considered 
  the 
  true 
  depressa. 
  

  

  Unio 
  Virginiana. 
  This 
  is 
  a 
  bad 
  specimen 
  of 
  radiatus, 
  in 
  the 
  Duke 
  

   de 
  Rivoli's 
  collection. 
  

  

  Unio 
  luteola. 
  From 
  the 
  description 
  and 
  locality, 
  I 
  formerly 
  sup- 
  

   posed 
  this 
  to 
  be 
  Say's 
  cariosus. 
  On 
  examining 
  the 
  specimen 
  at 
  the 
  

   Garden 
  of 
  Plants, 
  cited 
  by 
  Lamarck, 
  I 
  found 
  it 
  to 
  be 
  a 
  true 
  siliquoi- 
  

   deus 
  of 
  Barnes, 
  which 
  sometimes 
  approaches 
  the 
  cariosus. 
  There 
  

   must 
  be 
  an 
  error 
  in 
  the 
  locality 
  given 
  by 
  Lamarck, 
  as 
  this 
  species 
  does 
  

   not 
  inhabit 
  the 
  waters 
  east 
  of 
  the 
  Alleghany 
  mountains. 
  Lamarck's 
  

   name 
  has 
  precedence 
  to 
  that 
  of 
  Mr 
  Barnes. 
  

  

  Unio 
  angusta. 
  This 
  is 
  a 
  distinct 
  and 
  interesting 
  species. 
  Its 
  habi- 
  

   tat 
  is 
  unknown, 
  and 
  the 
  only 
  specimen 
  I 
  have 
  seen 
  is 
  in 
  the 
  collection 
  

   at 
  the 
  Garden 
  of 
  Plants. 
  

  

  Unio 
  mimca. 
  I 
  examined 
  the 
  original 
  specimen 
  in 
  the 
  cabinet 
  of 
  

  

  