﻿AND 
  OTHER 
  FAMILIES. 
  31 
  

  

  minent, 
  rounded 
  ; 
  ligament 
  rather 
  short 
  and 
  thick 
  ; 
  epidermis 
  dark 
  

   brown 
  or 
  black 
  ; 
  cardinal 
  teeth 
  wide, 
  striate, 
  but 
  not 
  divided 
  ; 
  lateral 
  

   teeth 
  somewhat 
  curved, 
  serrate 
  and 
  separated 
  from 
  the 
  cardinal 
  teeth 
  

   by 
  the 
  absence 
  of 
  a 
  plate 
  ; 
  anterior 
  cicatrices 
  distinct, 
  posterior 
  cica- 
  

   trices 
  confluent 
  and 
  large 
  ; 
  dorsal 
  cicatrices 
  situated 
  across 
  the 
  cavity 
  

   of 
  the 
  beaks 
  and 
  very 
  distinct 
  ; 
  cavity 
  of 
  the 
  beaks 
  large 
  and 
  rounded 
  ; 
  

   nacre 
  pearly 
  and 
  pink 
  coloured. 
  

  

  Remarks. 
  — 
  This 
  very 
  distinct 
  species 
  is 
  one 
  of 
  the 
  many 
  fine 
  shells 
  

   collected 
  by 
  Mr 
  Stewart 
  in 
  the 
  Bayou 
  Teche. 
  It 
  perhaps 
  most 
  re- 
  

   sembles 
  an 
  inflated 
  specimen 
  of 
  U. 
  cuneatus 
  (Barnes). 
  It 
  may, 
  how- 
  

   ever, 
  at 
  once 
  be 
  distinguished 
  from 
  that 
  species 
  by 
  its 
  peculiarly 
  beau- 
  

   tiful 
  pinky 
  lustre 
  and 
  striate 
  cardinal 
  teeth, 
  as 
  well 
  by 
  its 
  globosity. 
  

   The 
  striae 
  of 
  the 
  cardinal 
  teeth 
  diverge 
  from 
  a 
  point 
  beneath 
  the 
  

   point 
  of 
  the 
  beaks, 
  and 
  in 
  its 
  flatness 
  and 
  absence 
  of 
  a 
  cleft 
  these 
  

   teeth 
  resemble 
  those 
  of 
  the 
  U. 
  rubiginosus 
  (nobis). 
  

  

  Unio 
  capsjeformis. 
  Plate 
  II. 
  fig. 
  4. 
  

  

  Testa 
  elliplicd, 
  transversa, 
  insequilaterali, 
  subinflatd, 
  postice 
  subtriangulatd 
  ; 
  

   valvulis 
  antice 
  crassioribus 
  ; 
  naiibus 
  prominulis 
  ; 
  dentibus 
  utriusque 
  valvulse 
  car- 
  

   dinalibus, 
  elevatis 
  duplicibusque 
  ; 
  lateralibus 
  elevatis 
  et 
  lamellatis 
  ; 
  margaritd 
  

   alba 
  et 
  iridescente. 
  

  

  Shell 
  elliptical, 
  transverse, 
  inequilateral, 
  somewhat 
  inflated, 
  sub-biangulate 
  poste- 
  

   riorly 
  ; 
  valves 
  thicker 
  anteriorly 
  ; 
  beaks 
  slightly 
  elevated 
  ; 
  cardinal 
  teeth 
  elevated 
  and 
  

   double 
  in 
  both 
  valves 
  ; 
  lateral 
  teeth 
  elevated 
  and 
  lamellar 
  ; 
  nacre 
  pearly 
  white 
  and 
  iri- 
  

   descent. 
  

  

  Hab. 
  Cumberland 
  River. 
  W. 
  Cooper. 
  

  

  My 
  Cabinet. 
  

  

  Cabinet 
  of 
  W. 
  Cooper. 
  

  

  Cabinet 
  of 
  the 
  Academy 
  of 
  Natural 
  Sciences 
  of 
  Philadelphia. 
  

  

  Diam. 
  .9, 
  Length 
  1.3, 
  Breadth 
  1.9 
  inches. 
  

  

  Shell 
  elliptical, 
  transverse, 
  inequilateral, 
  somewhat 
  inflated, 
  flattish 
  

  

  before 
  the 
  umbonial 
  slope, 
  sub-biangulate 
  posteriorly 
  ; 
  substance 
  of 
  the 
  

  

  

  