﻿102 
  ON 
  THE 
  NAIADES, 
  

  

  or 
  some 
  of 
  its 
  tributaries. 
  This 
  species 
  has 
  somewhat 
  the 
  characters 
  

   of 
  the 
  obesus 
  (nobis), 
  and 
  the 
  complanatus 
  (Solander). 
  It 
  is 
  not 
  so 
  

   much 
  inflated 
  as 
  the 
  former, 
  and 
  is 
  more 
  so 
  than 
  the 
  latter. 
  My 
  oldest 
  

   specimen 
  is 
  subemarginate 
  on 
  the 
  basal 
  margin. 
  In 
  all 
  those 
  procured 
  

   by 
  Dr 
  Blanding, 
  the 
  beaks 
  were 
  much 
  eroded. 
  

  

  Unio 
  camelus. 
  Plate 
  XV. 
  fig. 
  45. 
  

  

  Testa 
  subtriangulari, 
  insequilaterali, 
  complanatd 
  per 
  umbones 
  a 
  natibus 
  usque 
  

   ad 
  marginem 
  inferior 
  'em 
  ; 
  valvulis 
  crassis 
  ; 
  radiis 
  sparsis 
  capillaribusque 
  ; 
  dente 
  

   cardinali 
  parvo, 
  laterali 
  magno, 
  crasso, 
  curvato 
  ; 
  margarita 
  albd. 
  

  

  Shell 
  subtriangular, 
  inequilateral, 
  flattened 
  over 
  the 
  umbones 
  from 
  the 
  beaks 
  to 
  the 
  

   basal 
  margin; 
  valves 
  thick; 
  rays 
  scattered 
  and 
  capillary; 
  cardinal 
  teeth 
  small; 
  lateral 
  

   teeth 
  large, 
  thick 
  and 
  curved 
  ; 
  nacre 
  white. 
  

  

  Hab. 
  Ohio 
  river. 
  T. 
  G. 
  Lea. 
  

  

  My 
  Cabinet. 
  

   Diam. 
  1-4, 
  Length 
  2-3, 
  Breadth 
  3-4 
  inches. 
  

  

  Shell 
  subtriangular, 
  inequilateral, 
  angular 
  behind, 
  flattened 
  over 
  the 
  

   umbones 
  from 
  the 
  beaks 
  to 
  the 
  basal 
  margin 
  ; 
  substance 
  of 
  the 
  shell 
  

   thick 
  : 
  ligament 
  thick 
  ; 
  epidermis 
  yellow 
  brown, 
  with 
  capillary 
  rays 
  ; 
  

   cardinal 
  teeth 
  small 
  ; 
  lateral 
  teeth 
  very 
  large, 
  thick 
  and 
  curved 
  ; 
  ante- 
  

   rior 
  and 
  posterior 
  cicatrices 
  both 
  distinct 
  ; 
  dorsal- 
  cicatrices 
  situated 
  on 
  

   the 
  inferior 
  part 
  of 
  the 
  cardinal 
  teeth; 
  cavity 
  of 
  the 
  shell 
  shallow, 
  

   welted 
  ; 
  cavity 
  of 
  the 
  beaks 
  very 
  shallow. 
  

  

  Remarks. 
  — 
  This 
  species 
  seems 
  to 
  possess 
  partly 
  the 
  characters 
  of 
  

   the 
  gibbosus 
  (Barnes), 
  and 
  partly 
  those 
  of 
  the 
  planulatus 
  (nobis). 
  It 
  

   may 
  be 
  distinguished 
  from 
  them 
  by 
  its 
  high 
  dorsal 
  margin, 
  its 
  very 
  

   remarkably 
  thick 
  lateral 
  tooth 
  and 
  its 
  capillary 
  rays. 
  

  

  