﻿REMARKABLE 
  MARINE 
  INVERTEBRATA 
  NEW 
  TO 
  THE 
  BRITISH 
  SEAS. 
  315 
  

  

  EXPLANATION 
  OF 
  THE 
  PLATES. 
  

  

  PLATE 
  IX. 
  

  

  Fig. 
  1. 
  Holothuria 
  intestinalis, 
  natural 
  size. 
  

  

  Fig. 
  2 
  a. 
  Arachnactis 
  albida, 
  natural 
  size 
  ; 
  and 
  2 
  b. 
  the 
  same 
  with 
  some 
  of 
  the 
  outer 
  tentacula 
  

  

  removed 
  in 
  order 
  to 
  shew 
  the 
  inner 
  circle 
  and 
  the 
  globular 
  form 
  at 
  times 
  assumed 
  by 
  the 
  body. 
  

   Fig. 
  3 
  a. 
  Sarcodictyon 
  agglomerata, 
  natural 
  size 
  ; 
  3 
  b. 
  the 
  same 
  magnified 
  ; 
  and 
  3 
  c. 
  the 
  polypes. 
  

   Fig. 
  4 
  a. 
  Syntethys 
  hebridicus, 
  less 
  than 
  the 
  natural 
  size 
  ; 
  4 
  b. 
  one 
  of 
  the 
  individual 
  Ascidians 
  of 
  

  

  the 
  size 
  of 
  nature 
  ; 
  4 
  c. 
  the 
  same 
  with 
  the 
  inner 
  tunic 
  retracted 
  ; 
  4 
  d. 
  the 
  orifices 
  of 
  the 
  inner 
  

  

  and 
  outer 
  tunics 
  much 
  magnified. 
  

  

  PLATE 
  X. 
  

  

  Fig. 
  1 
  a. 
  Plancia 
  gracilis, 
  three 
  times 
  the 
  natural 
  size, 
  seen 
  in 
  profile 
  ; 
  1 
  b. 
  the 
  same, 
  seen 
  from 
  

   above 
  ; 
  1 
  c. 
  its 
  peduncle 
  ; 
  1 
  d. 
  orifice 
  of 
  the 
  peduncle 
  ; 
  1 
  e. 
  extremity 
  of 
  a 
  tentacle. 
  

  

  Fig. 
  2 
  a. 
  Oceania 
  ducalis, 
  much 
  magnified, 
  and 
  seen 
  in 
  profile 
  ; 
  2 
  b. 
  the 
  peduncle, 
  ovaries, 
  and 
  

   mouth 
  ; 
  2 
  c. 
  one 
  of 
  its 
  tentacula. 
  

  

  Fig. 
  3 
  a. 
  Slabberia 
  catenata, 
  natural 
  size 
  ; 
  3 
  b. 
  the 
  same, 
  magnified 
  ; 
  3 
  c. 
  its 
  peduncle 
  ; 
  3 
  d. 
  genital 
  

   glands 
  on 
  the 
  side 
  of 
  a 
  gastro-vascular 
  canal 
  ; 
  3 
  e. 
  one 
  of 
  the 
  tentacula. 
  

  

  Fig. 
  4 
  a. 
  Natural 
  size 
  of 
  Hippocrene 
  pyramidata 
  ; 
  4 
  b. 
  the 
  same, 
  magnified 
  ; 
  4 
  c. 
  as 
  seen 
  from 
  above 
  ; 
  

  

  4 
  d. 
  the 
  genital 
  lobes 
  and 
  peduncle; 
  4 
  e. 
  genital 
  cross 
  ; 
  4/. 
  one 
  of 
  the 
  tentacular 
  fascicles. 
  

   Fig. 
  5 
  a. 
  Natural 
  size 
  of 
  Hippocrene 
  cruciata 
  ; 
  5 
  b. 
  lateral 
  view, 
  magnified 
  ; 
  5 
  c. 
  view 
  from 
  above 
  : 
  

  

  5 
  d. 
  genital 
  lobes 
  and 
  peduncle 
  ; 
  5 
  e. 
  one 
  of 
  the 
  tentacular 
  fascicles. 
  

  

  Fig. 
  6 
  a. 
  Natural 
  size 
  of 
  Hippocrene 
  simplex 
  ; 
  6 
  b. 
  lateral 
  view 
  magnified 
  ; 
  6 
  c. 
  the 
  view 
  from 
  below 
  ; 
  

  

  6 
  d. 
  one 
  of 
  the 
  tentacular 
  fascicles 
  ; 
  6 
  e. 
  genital 
  lobes 
  and 
  peduncle. 
  

  

  Fig. 
  7 
  a. 
  Thaumantias, 
  natural 
  size 
  ; 
  7 
  b. 
  diagram 
  of 
  same, 
  seen 
  from 
  above 
  ; 
  7 
  c. 
  section 
  shewing 
  

   the 
  genital 
  folds 
  and 
  stomach 
  ; 
  7 
  d. 
  margin 
  and 
  tentacula. 
  

  

  Fig. 
  8 
  a. 
  Thaumantias 
  conjluens, 
  side 
  view 
  magnified 
  ; 
  8 
  b. 
  diagram 
  of 
  view 
  from 
  above 
  ; 
  8 
  c. 
  pe- 
  

   duncle 
  and 
  buccal 
  lobes 
  ; 
  8 
  d. 
  margin 
  and 
  tentacula. 
  

  

  VOL. 
  XX. 
  PART 
  II. 
  4 
  Q 
  

  

  