﻿AND 
  OTHER 
  FAMILIES. 
  95 
  

  

  SECOND 
  SUPPLEMENT. 
  

  

  Read 
  before 
  the 
  American 
  Philosophical 
  Society, 
  February 
  7th, 
  1834. 
  

  

  Unio 
  Shepardianus. 
  Plate 
  XIII. 
  fig. 
  38. 
  

  

  Testa 
  sublanceolatd, 
  transversissimd, 
  valde 
  insequilaterali, 
  antice 
  rotundatd, 
  

   postice 
  obtuso-angulatd, 
  inferue 
  emarginatd. 
  ad 
  latera 
  plamdatd 
  ; 
  clivo 
  umboniali 
  

   elevato 
  ; 
  valvulis 
  subcrassis 
  ; 
  natibus 
  parvis, 
  prope 
  marginem 
  anteriorem 
  positis 
  : 
  

   epidermide 
  tenebroso-fuscd, 
  obsolete 
  radiatd; 
  dente 
  cardinali 
  obliquo, 
  in 
  valvuld 
  

   dextrd 
  unico, 
  in 
  sinistra 
  duplici 
  ; 
  dente 
  laterali 
  longissimo 
  rectoque 
  ; 
  margaritd 
  

   purpurea 
  et 
  iridescente. 
  

  

  Shell 
  sublanceolate, 
  very 
  transverse, 
  very 
  inequilateral, 
  rounded 
  before, 
  obtusely 
  

   angular 
  behind, 
  emarginate 
  at 
  base, 
  flattened 
  on 
  the 
  sides; 
  umbonial 
  slope 
  elevated 
  ; 
  

   valves 
  somewhat 
  thick 
  ; 
  beaks 
  small 
  and 
  placed 
  near 
  the 
  anterior 
  margin 
  ; 
  epidermis 
  

   dark 
  brown 
  with 
  obsolete 
  rays 
  ; 
  cardinal 
  teeth 
  oblique, 
  single 
  in 
  the 
  right 
  and 
  double 
  

   in 
  the 
  left 
  valve 
  ; 
  lateral 
  teeth 
  very 
  long 
  and 
  straight 
  ; 
  nacre 
  purple 
  and 
  iridescent. 
  

  

  Hab. 
  Hopeton, 
  near 
  Darien, 
  Georgia. 
  Professor 
  Shepard. 
  

  

  My 
  Cabinet. 
  

  

  Cabinet 
  of 
  Professor 
  Shepard. 
  

  

  Diam. 
  1, 
  Length 
  1-4, 
  Breadth 
  5 
  inches. 
  

  

  Shell 
  sublanceolate, 
  very 
  transverse, 
  very 
  inequilateral, 
  rounded 
  be- 
  

   fore, 
  obtusely 
  angular 
  behind, 
  emarginate 
  at 
  base, 
  flattened 
  over 
  the 
  

   umbones 
  and 
  sides 
  ; 
  umbonial 
  slope 
  forming 
  an 
  oblique 
  ridge 
  ; 
  substance 
  

   of 
  the 
  shell 
  rather 
  thick 
  ; 
  beaks 
  small 
  and 
  placed 
  near 
  to 
  the 
  anterior 
  

   margin 
  ; 
  ligament 
  thin 
  and 
  long 
  ; 
  epidermis 
  dark 
  brown, 
  almost 
  black, 
  

   with 
  obsolete 
  rays 
  on 
  the 
  more 
  perfect 
  individuals 
  ; 
  cardinal 
  teeth 
  erect, 
  

   single 
  in 
  the 
  right 
  valve 
  and 
  double 
  in 
  the 
  left 
  ; 
  lateral 
  teeth 
  very 
  long 
  

   and 
  straight 
  ; 
  anterior 
  cicatrices 
  distinct 
  ; 
  posterior 
  cicatrices 
  confluent 
  ; 
  

   dorsal 
  cicatrices 
  in 
  the 
  centre 
  of 
  the 
  cavity 
  of 
  the 
  beaks 
  : 
  cavity 
  of 
  the 
  

   beaks 
  very 
  shallow 
  ; 
  cavity 
  of 
  the 
  shell 
  deep 
  under 
  the 
  umbonial 
  slope 
  : 
  

   nacre 
  beautifully 
  purple 
  and 
  iridescent. 
  

  

  