﻿JReport 
  U. 
  

  

  (To 
  face 
  page 
  276.1 
  

  

  Plate 
  I. 
  

  

  Fig. 
  1. 
  Oyster 
  with 
  riKht 
  shell 
  and 
  mantle 
  removed, 
  a 
  and 
  a, 
  origin 
  of 
  arteries 
  from 
  the 
  ventricle- 
  

   mi, 
  auricle 
  of 
  heart: 
  It. 
  vessel 
  carrying 
  blood 
  from 
  the 
  gills 
  to 
  the 
  auricle 
  of 
  the 
  heart: 
  bi 
  outline 
  

   of 
  organ 
  ot 
  Bojauus. 
  the 
  so-called 
  kidney: 
  6w, 
  pores 
  from 
  which 
  the 
  water 
  issues 
  into 
  the 
  branchial 
  

   canals 
  after 
  passing 
  through 
  the 
  gills: 
  cl, 
  cloaca; 
  d. 
  pg. 
  ani\ 
  .«/. 
  connective 
  and 
  two 
  ganglia 
  of 
  the 
  

   nervous 
  system: 
  », 
  gills; 
  (jr. 
  cavity 
  between 
  the 
  two 
  mantle 
  folds; 
  /,, 
  hinge: 
  /, 
  ligament 
  1/ 
  ad- 
  

   ductor 
  muscle: 
  m, 
  mouth; 
  mt, 
  mantle, 
  the 
  arrows 
  show 
  the 
  direction 
  of 
  currents 
  pnidnced 
  in" 
  the 
  

   cilia; 
  ;>, 
  palps; 
  p'. 
  outer 
  end 
  of 
  right 
  pedal 
  muscle; 
  s, 
  external 
  opening 
  of 
  sexual 
  and 
  renal 
  organs 
  

   of 
  right 
  side; 
  v, 
  anus; 
  re. 
  ventricle 
  of 
  heart. 
  

  

  Fig. 
  2. 
  Diagram 
  to 
  show 
  sexual 
  organs 
  of 
  the 
  oyster, 
  d, 
  duct 
  of 
  sexual 
  gland. 
  Other 
  letters 
  as 
  above 
  

  

  