﻿308 
  

  

  K. 
  ETHERIDGE 
  ON 
  THE 
  RELATIONSHIP 
  BETWEEN 
  

  

  Pig. 
  1. 
  — 
  Calverla 
  Tiystrioc, 
  Wyville 
  Thomson. 
  (Two 
  thirds 
  nat. 
  size.) 
  * 
  

   (From 
  Thomson's 
  'Depths 
  of 
  the 
  Sea,' 
  p. 
  158, 
  fig. 
  27.) 
  

  

  Fig. 
  2. 
  — 
  Calveria 
  Tiy 
  stride, 
  Wyville 
  Thomson*. 
  

   (From 
  Thomson's 
  'Depths 
  of 
  the 
  Sea,' 
  p. 
  157, 
  fig. 
  28.) 
  

  

  Inner 
  surface 
  of 
  a 
  portion 
  of 
  the 
  test, 
  showing 
  the 
  structure 
  of 
  the 
  ambulacral 
  

   and 
  interambulacral 
  areas. 
  

  

  * 
  [We 
  are 
  indebted 
  to 
  the 
  kindness 
  of 
  Messrs. 
  Macmillan, 
  the 
  publishers 
  of 
  

   Prof. 
  Wyville 
  Thomson's 
  work, 
  for 
  the 
  loan 
  of 
  these 
  engravings. 
  — 
  Ed. 
  Q. 
  J. 
  G. 
  S.] 
  

  

  