﻿AND 
  OTHER 
  FAMILIES. 
  37 
  

  

  Remarks. 
  — 
  Among 
  the 
  Vhiones 
  there 
  is 
  a 
  group 
  to 
  which 
  this 
  species 
  

   naturally 
  belongs. 
  This 
  group 
  is 
  characterized 
  by 
  the 
  imperfection 
  of 
  

   the 
  hinge, 
  the 
  cardinal 
  teeth 
  being 
  so 
  immature 
  as 
  to 
  present 
  scarcely 
  any 
  

   thing 
  but 
  lobes. 
  Like 
  the 
  soleniformis 
  it 
  lives 
  under 
  stones 
  and 
  other 
  

   protected 
  places. 
  In 
  the 
  present 
  species 
  the 
  tooth 
  of 
  the 
  right 
  valve 
  

   shuts 
  before 
  that 
  of 
  the 
  left, 
  and 
  the 
  lateral 
  teeth, 
  if 
  not 
  entirely 
  want- 
  

   ing, 
  are 
  obsolete. 
  The 
  group, 
  as 
  far 
  as 
  I 
  know 
  it 
  at 
  present, 
  consists 
  

   of 
  the 
  U. 
  oriens 
  (nobis), 
  U. 
  soleniformis 
  (nobis), 
  and 
  the 
  present 
  species. 
  

   In 
  size 
  and 
  outline 
  of 
  the 
  margin, 
  this 
  species 
  resembles 
  the 
  U. 
  iris 
  

   (nobis). 
  It 
  has 
  not, 
  however, 
  the 
  brilliant 
  nacre, 
  nor 
  the 
  fine 
  rays 
  of 
  

   that 
  species, 
  and 
  in 
  the 
  conformation 
  of 
  the 
  teeth 
  it 
  difFers 
  very 
  much. 
  

   Some 
  individuals 
  vary 
  from 
  the 
  cylindrical 
  form, 
  being 
  somewhat 
  com- 
  

   pressed. 
  As 
  a 
  mark 
  of 
  respect 
  for 
  the 
  talents 
  of 
  Dr 
  Hildreth, 
  and 
  his 
  

   assiduity 
  in 
  promoting 
  a 
  knowledge 
  of 
  the 
  natural 
  history 
  of 
  his 
  vici- 
  

   nity, 
  I 
  dedicate 
  this 
  species 
  to 
  him. 
  

  

  Unio 
  Schoolcraftensis. 
  Plate 
  III. 
  fig. 
  9. 
  

  

  Testa 
  subrotundatd, 
  subasquilaterali, 
  compressd, 
  post 
  clivum 
  umboniale 
  subtu- 
  

   berculatd 
  ; 
  valvulis 
  subcrassis 
  ; 
  naiibus 
  prominentibus 
  ; 
  epidermide 
  fulvd, 
  lato- 
  

   radiatd 
  ; 
  deniibus 
  cardinalibus 
  prominentibus, 
  lateralibus 
  laminatis 
  rectisque 
  ; 
  

   margaritd 
  alba 
  et 
  iridescente. 
  

  

  Shell 
  subrotund, 
  nearly 
  equilateral, 
  compressed, 
  slightly 
  tuberculated 
  behind 
  the 
  

   umbonial 
  slope 
  ; 
  valves 
  rather 
  thick 
  ; 
  beaks 
  elevated 
  ; 
  epidermis 
  yellow 
  with 
  broad 
  

   rays 
  ; 
  cardinal 
  teeth 
  elevated 
  ; 
  lateral 
  teeth 
  straight 
  and 
  lamellar; 
  nacre 
  pearly 
  white 
  

   and 
  iridescent. 
  

  

  Hab. 
  Fox 
  River 
  of 
  Green 
  Bay. 
  Mr 
  Schoolcraft. 
  

   Cabinet 
  of 
  the 
  Academy 
  of 
  Natural 
  Sciences 
  of 
  Philadelphia. 
  

   Diam. 
  -7, 
  Length 
  1-1, 
  Breadth 
  1-3 
  inches. 
  

  

  Shell 
  subrotund, 
  somewhat 
  angular 
  at 
  posterior 
  dorsal 
  margin, 
  nearly 
  

   equilateral, 
  compressed, 
  slightly 
  tuberculated 
  posterior 
  to 
  umbonial 
  

   slope 
  ; 
  substance 
  of 
  the 
  shell 
  rather 
  thick 
  ; 
  beaks 
  elevated 
  ; 
  ligament 
  

   short 
  ; 
  epidermis 
  smooth, 
  somewhat 
  yellow, 
  with 
  several 
  broad 
  green 
  

   rays 
  — 
  that 
  over 
  the 
  centre 
  of 
  the 
  disk 
  being 
  broadest 
  ; 
  cardinal 
  teeth 
  

  

  V0E. 
  V. 
  K 
  

  

  