﻿672 
  EXPLANATION 
  OP 
  THE 
  PLATES. 
  

  

  rig. 
  C. 
  Dys'uUa 
  digitifera. 
  The 
  type 
  specimen, 
  from 
  Albany 
  

   Island, 
  8 
  fms. 
  ; 
  in 
  spirit 
  ; 
  growing 
  over 
  Hydroid 
  zoophyte. 
  

   Nat. 
  size. 
  

  

  D. 
  GladocJialina 
  diffusa. 
  One 
  of 
  the 
  type 
  specimens, 
  from 
  

  

  Singapore, 
  between 
  tide-marks 
  ; 
  in 
  spirit. 
  Reduced 
  to 
  

   two 
  thirds 
  nat. 
  size. 
  d. 
  Portions 
  of 
  primary 
  and 
  secon- 
  

   dary 
  fibre 
  of 
  vertical 
  section, 
  x 
  95. 
  d' 
  . 
  Detached 
  

   spicule, 
  X 
  190. 
  

  

  E. 
  Ilymeniacidon 
  agminata. 
  The 
  type 
  specimen, 
  from 
  Port 
  

  

  Jackson, 
  0-5 
  fms. 
  ; 
  in 
  spirit. 
  Eeduced 
  to 
  two 
  thirds 
  nat. 
  

   size. 
  

  

  F. 
  Basjjailia 
  clathrata. 
  Basal 
  portion 
  of 
  type 
  specimen, 
  from 
  

  

  Thursday 
  Island, 
  3-4 
  fms. 
  Nat. 
  size. 
  

  

  g. 
  Euspongia 
  offcincdis, 
  var. 
  cavernosa. 
  Vertical 
  section 
  of 
  

   type 
  (dry) 
  specimen, 
  from 
  Torres 
  Straits, 
  x 
  38. 
  

  

  7i. 
  Psammojpemma 
  densum, 
  var. 
  subjtbrosa. 
  Yertical 
  section 
  of 
  

   type 
  (spirit) 
  specimen, 
  from 
  Torres 
  Straits, 
  x 
  38. 
  [The 
  

   surface 
  faces 
  to 
  the 
  right.] 
  

  

  {. 
  CladocJialina 
  nuda. 
  Portion 
  of 
  vertical 
  section 
  of 
  type 
  

   specimen, 
  from 
  Alert 
  Island, 
  showing 
  the 
  contained 
  spi- 
  

   cules. 
  X 
  190. 
  

  

  j. 
  C. 
  nuda, 
  var. 
  ahruptlspicida. 
  Spicules 
  of 
  type 
  specimen 
  

   from 
  Thursday 
  Island, 
  x 
  190. 
  

  

  Tc. 
  Chalina 
  monilaia, 
  portion 
  of 
  primary 
  fibre 
  of 
  vertical 
  

   section 
  of 
  type, 
  from 
  Port 
  Jackson, 
  showing 
  the 
  contained 
  

   spicules, 
  X 
  370. 
  k'. 
  An 
  isolated 
  spicule, 
  x 
  370. 
  

  

  I. 
  GladocJialina 
  subarmigera, 
  portion 
  of 
  primary 
  and 
  secon- 
  

   dary 
  fibres 
  of 
  vertical 
  section, 
  V, 
  spicules, 
  of 
  type 
  specimen, 
  

   from 
  Warrior 
  Reef, 
  x 
  190. 
  

  

  m. 
  Toxoclialina 
  foUoides, 
  fibre 
  of 
  main 
  skeleton 
  as 
  seen 
  in 
  

   vertical 
  section, 
  m'. 
  Skeleton-spicule, 
  x 
  68. 
  m". 
  Tri- 
  

   curvate 
  flesh-spicule, 
  x 
  370. 
  From 
  specimen 
  from 
  Port 
  

   Darwin. 
  

  

  