﻿AND 
  OTHER 
  FAMILIES. 
  65 
  

  

  the 
  cavity 
  of 
  the 
  beaks 
  ; 
  cavity 
  of 
  the 
  beaks 
  shallow 
  and 
  subangular 
  ; 
  

   nacre 
  white 
  and 
  iridescent. 
  

  

  Remarks. 
  — 
  This 
  beautiful 
  little 
  species 
  I 
  procured 
  from 
  the 
  cabinet 
  

   of 
  the 
  Duke 
  de 
  Rivoli 
  in 
  Paris. 
  It 
  appears 
  to 
  me 
  to 
  be 
  inedited, 
  and 
  

   may 
  perhaps 
  have 
  been 
  considered 
  a 
  transverse 
  variety 
  of 
  the 
  corru- 
  

   gatus 
  (Lam.). 
  It 
  ought 
  not 
  to 
  be 
  confounded 
  with 
  that 
  species, 
  

   being 
  much 
  more 
  transverse, 
  and 
  the 
  folds 
  of 
  the 
  beaks 
  differing. 
  

   Lamarck, 
  in 
  his 
  description 
  of 
  the 
  corrugatus, 
  says, 
  " 
  rugis 
  angulato- 
  

   flexuosis." 
  The 
  folds 
  of 
  the 
  divaricatus 
  are 
  well 
  marked, 
  without 
  an- 
  

   gles, 
  and 
  diverge 
  from 
  the 
  point 
  of 
  the 
  beaks. 
  

  

  Unio 
  Corrianus. 
  Plate 
  IX. 
  fig. 
  25. 
  

  

  Testa 
  angusto-ellipticd, 
  transversissimd, 
  valde 
  insequilaterd, 
  postice 
  subangu- 
  

   latd; 
  valvulis 
  tenuissimis 
  ; 
  natibus 
  vix 
  prominulis 
  ; 
  dentibus 
  cardinalibus 
  tenuibus 
  

   et 
  laminatis 
  ; 
  lateralibus 
  longis, 
  tenuibus, 
  subrectisque 
  ; 
  margaritd 
  albd 
  et 
  irides- 
  

   cente. 
  

  

  Shell 
  narrow-elliptical, 
  very 
  transverse, 
  very 
  inequilateral, 
  subangular 
  behind 
  ; 
  valves 
  

   very 
  thin 
  ; 
  beaks 
  scarcely 
  prominent 
  ; 
  cardinal 
  teeth 
  thin 
  and 
  bladed 
  ; 
  lateral 
  teeth 
  long, 
  

   thin 
  and 
  nearly 
  straight 
  ; 
  nacre 
  pearly 
  white 
  and 
  iridescent. 
  

  

  Hab. 
  India. 
  Mrs 
  Corrie. 
  

  

  My 
  Cabinet. 
  

   Cabinet 
  of 
  the 
  Academy 
  of 
  Natural 
  Sciences 
  of 
  Philadelphia. 
  

   Diam. 
  *6, 
  Length 
  1, 
  Breadth 
  2*1 
  inches. 
  

  

  Shell 
  narrow 
  elliptical, 
  very 
  transverse, 
  very 
  inequilateral, 
  subangu- 
  

   lar 
  behind 
  ; 
  dorsal 
  line 
  nearly 
  straight 
  ; 
  substance 
  of 
  the 
  shell 
  very 
  thin 
  ; 
  

   beaks 
  very 
  slightly 
  elevated 
  and 
  minutely 
  waved 
  at 
  the 
  tip; 
  ligament 
  

   long 
  and 
  slender 
  ; 
  epidermis 
  smooth, 
  dark 
  brown 
  ; 
  rays 
  none 
  ; 
  cardinal 
  

   teeth 
  thin, 
  bladed, 
  single 
  in 
  the 
  left 
  valve 
  and 
  double 
  in 
  the 
  right 
  ; 
  

   lateral 
  teeth 
  long, 
  thin, 
  bladed 
  and 
  nearly 
  straight; 
  anterior 
  cicatrices 
  

   distinct 
  ; 
  posterior 
  cicatrices 
  confluent 
  ; 
  dorsal 
  cicatrices 
  situated 
  nearly 
  

   in 
  the 
  centre 
  of 
  the 
  cavity 
  of 
  the 
  beaks 
  ; 
  cavity 
  of 
  the 
  beaks 
  exceed- 
  

   ingly 
  shallow 
  ; 
  nacre 
  pearly 
  white 
  and 
  iridescent. 
  

   vol. 
  v. 
  — 
  R 
  

  

  