﻿110 
  ON 
  THE 
  NAIADES, 
  

  

  Cyrena 
  Woodiana. 
  Plate 
  XVIII. 
  fig. 
  55. 
  

  

  Testa 
  subtrigond, 
  subinflatd, 
  micante, 
  subsequilaterali, 
  transversim 
  rugatd 
  ; 
  val- 
  

   vulis 
  crassis 
  ; 
  natibus 
  magnis 
  et 
  rotundatis 
  ; 
  dentibus 
  cardinalibus 
  sub-bifidis, 
  

   lateralibus 
  longis, 
  serratis, 
  rectisque; 
  margaritd 
  alba. 
  

  

  Shell 
  subtriangular, 
  somewhat 
  inflated, 
  shining, 
  nearly 
  equilateral, 
  transversely 
  wrin- 
  

   kled 
  ; 
  valves 
  thick 
  ; 
  beaks 
  large 
  and 
  rounded 
  ; 
  cardinal 
  teeth 
  disposed 
  to 
  be 
  bifid 
  ; 
  late- 
  

   ral 
  teeth 
  long, 
  straight, 
  serrulate 
  ; 
  nacre 
  white. 
  

  

  Hab. 
  Canton. 
  W. 
  W. 
  Wood. 
  

  

  My 
  Cabinet. 
  

   Diam. 
  1-4, 
  Length 
  2-4, 
  Breadth 
  2-9 
  inches. 
  

  

  Shell 
  subtriangular, 
  obtusely 
  angular 
  behind, 
  somewhat 
  inflated, 
  

   shining, 
  nearly 
  equilateral, 
  transversely 
  and 
  rather 
  largely 
  wrinkled 
  ; 
  

   substance 
  of 
  the 
  shell 
  thick 
  ; 
  beaks 
  large, 
  rounded, 
  not 
  very 
  approxi- 
  

   mate 
  ; 
  ligament 
  rather 
  short 
  and 
  thick 
  ; 
  epidermis 
  blackish 
  brown, 
  

   polished, 
  except 
  on 
  posterior 
  slope; 
  wrinkles 
  larger 
  near 
  to 
  the 
  margin 
  ; 
  

   cardinal 
  teeth 
  disposed 
  to 
  be 
  bifid 
  ; 
  lateral 
  teeth 
  long, 
  straight, 
  serrulate 
  ; 
  

   cicatrices 
  scarcely 
  perceptible; 
  cavity 
  of 
  the 
  shell 
  deep; 
  cavity 
  of 
  the 
  

   beaks 
  angular; 
  nacre 
  white. 
  

  

  Remarks. 
  — 
  In 
  the 
  intenseness 
  of 
  colour 
  of 
  the 
  epidermis, 
  and 
  its 
  high 
  

   polish, 
  this 
  species 
  differs 
  from 
  any 
  I 
  am 
  acquainted 
  with. 
  It 
  is 
  more 
  

   inflated 
  and 
  less 
  rotund 
  than 
  the 
  rotundata 
  herein 
  described. 
  Its 
  

   lateral 
  teeth 
  are 
  longer 
  and 
  not 
  so 
  minutely 
  serrulate. 
  In 
  its 
  triangular 
  

   form 
  it 
  resembles 
  the 
  C. 
  papua 
  (Lesson). 
  The 
  nacre 
  has 
  not 
  the 
  

   clear 
  white 
  usual 
  in 
  this 
  genus. 
  In 
  this 
  specimen, 
  below 
  the 
  palleal 
  

   impression, 
  it 
  is 
  yellowish 
  white. 
  

  

  Mr 
  Wood, 
  to 
  whose 
  great 
  kindness 
  I 
  owe 
  this 
  fine 
  and 
  interesting 
  

   species, 
  informed 
  me 
  he 
  procured 
  it 
  from 
  a 
  boat 
  on 
  the 
  river 
  below 
  

   Canton, 
  it 
  having 
  been 
  fished 
  up 
  by 
  accident, 
  when 
  the 
  fishermen 
  

   were 
  engaged 
  in 
  catching 
  other 
  shell 
  fish. 
  Owing 
  the 
  possession 
  of 
  it 
  

   to 
  him, 
  I 
  with 
  great 
  pleasure 
  dedicate 
  it 
  to 
  him. 
  

  

  