﻿104 
  ON 
  THE 
  NAIADES, 
  

  

  valvuld 
  utrdque 
  duplicibus 
  ; 
  lateralibus 
  longis 
  curvisque 
  ; 
  margaritd 
  purpurea, 
  

   aut 
  salmonis 
  colore 
  tinctd. 
  

  

  Shell 
  trapezoidal, 
  transverse, 
  inequilateral, 
  inflated 
  ; 
  valves 
  rather 
  thick 
  ; 
  beaks 
  

   slightly 
  elevated 
  and 
  transversely 
  wrinkled 
  ; 
  cardinal 
  teeth 
  compressed 
  and 
  double 
  in 
  

   both 
  valves 
  ; 
  lateral 
  teeth 
  long 
  and 
  curved 
  ; 
  nsere 
  purple 
  or 
  salmon. 
  

  

  Hab. 
  Santee 
  Canal, 
  South 
  Carolina. 
  Professor 
  Ravenel. 
  

  

  My 
  Cabinet. 
  

  

  Cabinet 
  of 
  Professor 
  Ravenel. 
  

  

  Diaui. 
  1*1, 
  Length 
  1-3, 
  Breadth 
  2-4 
  inches. 
  

  

  Shell 
  trapezoidal, 
  transverse, 
  inequilateral, 
  inflated 
  ; 
  substance 
  of 
  the 
  

   shell 
  rather 
  thick 
  ; 
  beaks 
  slightly 
  elevated, 
  incurved, 
  transversely 
  wrin- 
  

   kled 
  ; 
  umbones 
  very 
  much 
  swollen 
  ; 
  ligament 
  rather 
  short 
  and 
  thin 
  ; 
  

   epidermis 
  dark 
  brown, 
  shining; 
  cardinal 
  teeth 
  very 
  much 
  compressed; 
  

   lateral 
  teeth 
  long 
  and 
  slightly 
  curved 
  ; 
  anterior 
  cicatrices 
  distinct 
  ; 
  pos- 
  

   terior 
  cicatrices 
  confluent 
  ; 
  dorsal 
  cicatrices 
  on 
  the 
  superior 
  part 
  of 
  the 
  

   cavity 
  of 
  the 
  beaks 
  ; 
  cavity 
  of 
  the 
  shell 
  very 
  deep 
  ; 
  cavity 
  of 
  the 
  beaks 
  

   full 
  and 
  rounded 
  ; 
  nacre 
  purple 
  or 
  salmon. 
  

  

  Remarks. 
  — 
  The 
  confertus, 
  in 
  its 
  general 
  characters, 
  resembles 
  the 
  

   complanatus 
  (Solander). 
  It 
  is, 
  however, 
  much 
  more 
  inflated, 
  and 
  dif- 
  

   fers 
  in 
  having 
  teeth 
  more 
  compressed. 
  The 
  specimens 
  in 
  my 
  cabinet 
  

   I 
  owe 
  to 
  the 
  kindness 
  of 
  professor 
  Ravenel. 
  These 
  are 
  all 
  without 
  

   rays. 
  In 
  young 
  specimens 
  they 
  may 
  exist. 
  

  

  Symphynota 
  Benedictensis. 
  Plate 
  XVI. 
  fig. 
  48. 
  

  

  Testa 
  trapezio 
  simili, 
  inxquilaterd, 
  transversa, 
  subcompressd, 
  margine 
  dorsali 
  

   subrecld 
  ; 
  valvulis 
  pertenuibus 
  ; 
  natibus 
  subprominentibus, 
  apicibus 
  granulatis 
  ; 
  

   cicatricibus 
  vix 
  cernendis 
  ; 
  margaritd 
  cozruleo-albd 
  et 
  iridescente. 
  

  

  Shell 
  trapezoidal, 
  inequilateral, 
  transverse, 
  rather 
  compressed, 
  nearly 
  straight 
  on 
  the 
  

   dorsal 
  margin; 
  valves 
  very 
  thin 
  ; 
  beaks 
  somewhat 
  prominent, 
  and 
  granulate 
  at 
  tip 
  ; 
  

   cicatrices 
  scarcely 
  perceptible 
  ; 
  nacre 
  bluish 
  white 
  and 
  iridescent. 
  

  

  Hab. 
  Lake 
  Champlain. 
  

  

  