﻿EXPLANATION 
  OF 
  THE 
  PLATES, 
  683 
  

  

  Plate 
  LIV* 
  

  

  Fig. 
  a. 
  LeucaUis 
  bathyhia, 
  var. 
  mascwetiica, 
  the 
  two 
  forms 
  of 
  stout 
  

   quadriradiate 
  and 
  the 
  triradiate 
  spicules 
  of 
  the 
  main 
  

   skeleton, 
  x 
  38. 
  a'. 
  The 
  minute 
  tri- 
  and 
  quadrii'adiates 
  

   of 
  the 
  cloacal 
  surface, 
  X 
  370. 
  From 
  type 
  specimen 
  from 
  

   Seychclle 
  Islands. 
  

  

  h. 
  Axinella 
  spicidifera, 
  two 
  sizes 
  of 
  the 
  skeleton- 
  spicule, 
  x 
  68, 
  

   From 
  specimen 
  from 
  Darros 
  Island. 
  

  

  c. 
  A. 
  2:>roUferans, 
  the 
  skeleton-spicule, 
  x 
  68, 
  From 
  typo 
  

  

  specimen 
  from 
  Providence 
  Island. 
  

  

  d. 
  Leucortis 
  (imjuinea, 
  the 
  stout 
  acerate, 
  and 
  different 
  forms 
  

  

  of 
  the 
  tri- 
  and 
  (luadriradiate 
  spicules 
  of 
  the 
  main 
  ske- 
  

   leton, 
  x 
  68. 
  d\ 
  the 
  slender 
  acerate 
  (?) 
  of 
  the 
  peristome 
  

   (the 
  outer 
  end 
  imperfect), 
  x 
  370. 
  From 
  type 
  specimen 
  

   from 
  Providence 
  Keef. 
  

  

  e. 
  Erylus 
  cyUndrigerns. 
  part 
  of 
  the 
  disk-spicule, 
  in 
  profile, 
  x 
  190. 
  

  

  <?', 
  the 
  disk-spicule, 
  from 
  the 
  front 
  (tubercles 
  omitted, 
  

   except 
  at 
  apex), 
  x 
  190 
  ; 
  ee", 
  the 
  same, 
  the 
  tubercles, 
  x 
  300 
  ; 
  

   e"\ 
  the 
  cylindrical 
  spicule, 
  two 
  forms, 
  x 
  68 
  : 
  e"" 
  , 
  the 
  mi- 
  

   nute 
  acerate 
  spicule, 
  young 
  and 
  adult, 
  x 
  190 
  ; 
  e'"" 
  , 
  larger 
  

   stellate 
  spicule, 
  two 
  forms, 
  showing 
  variation 
  in 
  the 
  num- 
  

   ber 
  and 
  spination 
  of 
  the 
  rays, 
  x 
  190 
  ; 
  <?""", 
  the 
  small 
  

   stellate, 
  x 
  370, 
  From 
  specimen 
  from 
  Providence 
  Reef. 
  

  

  /. 
  Esperia 
  yelatinosa, 
  the 
  subspinulate, 
  /', 
  large, 
  and 
  /", 
  

   small 
  anchorate 
  (the 
  latter 
  from 
  the 
  front 
  and 
  side), 
  

   /", 
  bihamate 
  spicules 
  ; 
  /"", 
  trichite-bundle. 
  x 
  370. 
  From 
  

   specimen 
  from 
  Providence 
  Island. 
  

  

  f). 
  Clathria 
  dccumbens, 
  the 
  skeleton 
  and 
  echinuting 
  acuate 
  

   spicules, 
  x 
  190. 
  g', 
  the 
  equianchorate 
  flesh-spicule, 
  from 
  

   the 
  front 
  and 
  side, 
  x 
  370. 
  From 
  type 
  specimen 
  from 
  

   Etoile 
  Island. 
  

  

  * 
  iVVc— 
  The 
  figures 
  in 
  tliis 
  rUitc 
  hare 
  been 
  prepared 
  with 
  the 
  aid 
  of 
  

   sketches, 
  to 
  scale, 
  made 
  h\ 
  Mr. 
  Eidlcy. 
  

  

  