﻿REVIEW 
  OF 
  THE 
  ATLANTIC 
  PERIWINKLES 
  — 
  ABBOTT 
  453 
  

  

  Figure 
  55. 
  — 
  a. 
  Shell 
  of 
  Echininus 
  nodulosus 
  Pfeiffer 
  (X 
  IH)- 
  b, 
  Shell 
  of 
  Nodilittorina 
  

   tuberculata 
  Menke 
  (X 
  IH)- 
  c. 
  Underside 
  of 
  foot 
  of 
  E. 
  nodulosus 
  ( 
  X 
  2). 
  d. 
  Underside 
  of 
  

   foot 
  of 
  N. 
  tuberculata 
  (X 
  2). 
  e. 
  Operculum 
  of 
  E. 
  nodulosus 
  (X 
  2). 
  /, 
  Operculum 
  of 
  N. 
  

   tuberculata 
  {Y. 
  2) 
  . 
  g, 
  Fecal 
  pellets 
  of 
  ^. 
  noiw/ojM/ 
  (X 
  4). 
  h. 
  Fecal 
  pellets 
  of 
  iV. 
  ^wiifrcM- 
  

   /aia(X4). 
  i, 
  Fecal 
  pellets 
  of 
  ikfof/w/w/ 
  moi^M/MJ 
  Linne 
  (X 
  4). 
  j. 
  Ferns 
  oi 
  Littorinaziczac 
  

   Gmelin 
  (X 
  6). 
  k, 
  Floating 
  egg 
  capsule 
  of 
  L. 
  ziczac 
  (diam. 
  0.20 
  mm.). 
  /, 
  Egg 
  capsule 
  of 
  

   N. 
  tuberculata 
  (diam. 
  0.24 
  mm.), 
  m, 
  Egg 
  capsule 
  of 
  Tectarius 
  muricatus 
  Linne 
  (diam. 
  0.24 
  

   to 
  0.32. 
  After 
  Lebour, 
  1945). 
  n, 
  Ferns 
  oi 
  N. 
  tuberculata 
  {X 
  6). 
  o, 
  Ferns 
  oi 
  T. 
  muricatus 
  

   (X 
  6). 
  p, 
  q. 
  Penis 
  of 
  E. 
  nodulosus 
  (X 
  6). 
  

  

  