﻿92 
  ON 
  THE 
  NAIADES 
  

  

  Baron 
  de 
  Ferussac, 
  which 
  Lamarck 
  described, 
  and 
  I 
  convinced 
  the 
  

   Baron 
  that 
  it 
  was 
  only 
  a 
  pictorum. 
  

  

  Unio 
  cariosa. 
  The 
  two 
  specimens 
  described 
  are 
  both 
  in 
  the 
  cabi- 
  

   net 
  of 
  the 
  Duke 
  de 
  Rivoli. 
  The 
  first 
  is 
  a 
  bad 
  specimen 
  of 
  Say's 
  cario- 
  

   sus. 
  The 
  other 
  (Var. 
  2) 
  is 
  a 
  bad 
  specimen 
  of 
  the 
  Alasmodonta 
  mar- 
  

   ginata 
  (Say). 
  „ 
  One 
  of 
  the 
  habitats, 
  Lake 
  Erie, 
  is 
  an 
  error 
  ; 
  it 
  is 
  found 
  

   only 
  in 
  our 
  waters 
  east 
  of 
  the 
  Alleghany 
  mountains. 
  

  

  Unio 
  spuria. 
  This 
  species 
  is 
  mentioned 
  by 
  Lamarck 
  as 
  being 
  in 
  the 
  

   museum 
  of 
  the 
  Garden 
  of 
  Plants. 
  I 
  did 
  not 
  see 
  it 
  there, 
  nor 
  do 
  I 
  

   know 
  it 
  to 
  be 
  in 
  any 
  other 
  collection. 
  

  

  Unio 
  australis. 
  The 
  same 
  remarks 
  apply 
  to 
  this 
  species. 
  

  

  Unio 
  anodontina. 
  I 
  examined 
  the 
  individual 
  described 
  under 
  this 
  

   name 
  in 
  the 
  collection 
  of 
  the 
  Duke 
  de 
  Rivoli. 
  It 
  proved 
  to 
  be 
  a 
  spe- 
  

   cimen 
  of 
  U 
  marginalis, 
  which 
  species 
  is 
  yet 
  known 
  to 
  inhabit 
  only 
  the 
  

   fresh 
  waters 
  of 
  India. 
  Lamarck 
  says 
  it 
  comes 
  from 
  Virginia, 
  which 
  is 
  

   certainly 
  an 
  error. 
  

  

  Unio 
  suborbiculata. 
  This 
  is 
  only 
  a 
  rotundata, 
  as 
  mentioned 
  before 
  

   in 
  my 
  observations 
  on 
  that 
  species. 
  % 
  

  

  Hyria 
  avicularis. 
  This 
  is 
  the 
  Mya 
  syrmatophora 
  of 
  Gronovius, 
  

   Gmel., 
  Dill., 
  &c. 
  : 
  avicularis 
  should 
  therefore 
  be 
  abandoned. 
  Lamarck 
  

   is 
  not 
  certain 
  of 
  the 
  habitat 
  of 
  his 
  specimen, 
  but 
  believes 
  it 
  to 
  be 
  from 
  

   Brazil. 
  I 
  have 
  seen 
  in 
  Paris 
  a 
  specimen 
  brought 
  by 
  Spix 
  from 
  that 
  

   country.* 
  

  

  Hyria 
  corrugata 
  is 
  remarkable 
  for 
  the 
  folds 
  on 
  the 
  umbones, 
  and 
  is 
  

   a 
  very 
  distinct 
  species. 
  — 
  They 
  are 
  both 
  in 
  my 
  cabinet. 
  

  

  Anodonta 
  cygnea. 
  The 
  well 
  known 
  Mytilus 
  cygneus 
  of 
  Linnaeus 
  

   and 
  others. 
  Of 
  the 
  various 
  forms 
  of 
  this 
  there 
  have 
  been 
  created 
  per- 
  

   haps 
  a 
  dozen 
  different 
  species. 
  

  

  Anodonta 
  anatina 
  resembles 
  very 
  closely 
  the 
  cygnea, 
  but 
  is 
  most 
  

   probably 
  a 
  distinct 
  species. 
  Poiret 
  asserts 
  that 
  this 
  species 
  is 
  ovipa- 
  

  

  * 
  This 
  traveller 
  brought 
  also 
  the 
  Castalia 
  ambigua, 
  whrch, 
  Lamarck 
  says, 
  seems 
  to 
  be 
  flu- 
  

   viatile, 
  but 
  which 
  he 
  nevertheless 
  separates 
  from 
  the 
  Naiades, 
  to 
  which 
  it 
  naturally 
  belongs, 
  

   and 
  not 
  to 
  the 
  family 
  Trigoniana. 
  Both 
  the 
  shells 
  are 
  figured 
  in 
  Spix's 
  beautiful 
  work, 
  but 
  

   described 
  with 
  too 
  little 
  attention 
  to 
  previous 
  writers. 
  

  

  