﻿674 
  EXPLANATION 
  OF 
  THE 
  PLATES. 
  

  

  Fig. 
  z. 
  Oellius 
  cymiformis. 
  Spicules, 
  X 
  370. 
  From 
  specimen 
  from 
  

   Thursday 
  Island. 
  

   aa. 
  Crella 
  sclimidti. 
  Spicules 
  (anchorate 
  from 
  front 
  and 
  side), 
  

   X 
  370. 
  From 
  type 
  specimen 
  from 
  Port 
  Jackson. 
  

  

  66. 
  Gclliodes 
  fihulata, 
  fibre 
  of 
  part 
  of 
  vertical 
  section, 
  showing 
  

   the 
  very 
  stout 
  and 
  straight 
  primary 
  and 
  the 
  secondary 
  

   fibres 
  ; 
  66', 
  portion 
  of 
  secondary 
  fibre, 
  sho-wing 
  arrange- 
  

   ment 
  of 
  spicules 
  and 
  isolated 
  skcleton-spicule 
  : 
  x 
  68. 
  

   66". 
  Bihamato 
  spicules, 
  x 
  370. 
  From 
  dry 
  specimen 
  from 
  

   Prince 
  of 
  Wales 
  Channel. 
  

  

  cc. 
  Ampliilectus 
  tibiellifer, 
  skeleton 
  acuate 
  and 
  tibiella-spicules, 
  

   X 
  190 
  (head 
  of 
  latter 
  enlarged), 
  cc'. 
  Tricurvate 
  acerate, 
  

   X 
  190. 
  cc". 
  Anchorate 
  seen 
  from 
  front 
  and 
  side, 
  x 
  370. 
  

   From 
  one 
  of 
  the 
  types 
  from 
  Prince 
  of 
  Wales 
  Channel. 
  

  

  Plate 
  XLII. 
  

   Fig. 
  a. 
  Myxilla 
  arhorescens, 
  portion 
  of 
  vertical 
  section, 
  x 
  190. 
  

   «'. 
  Skeleton 
  acerate 
  spicules, 
  x 
  190. 
  a". 
  Equianchorate 
  

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

   (in 
  spirit) 
  from 
  Port 
  Jackson. 
  

  

  6. 
  Acarmis 
  ternatus, 
  acuate, 
  grapnel, 
  and 
  tricurvate 
  spicules, 
  

   and 
  head 
  of 
  grapnel 
  as 
  seen 
  from 
  above, 
  x 
  190. 
  6'. 
  Ti- 
  

   biella 
  and 
  equianchorate 
  (from 
  front 
  and 
  side) 
  spicules, 
  

   X 
  370. 
  From 
  specimen 
  from 
  West 
  Island, 
  Torres 
  Straits. 
  

  

  c. 
  Oj>hlitispongia 
  australiensis, 
  fibre 
  of 
  vertical 
  section, 
  x 
  190. 
  

  

  c'. 
  Skeleton 
  cylindrical 
  and 
  echinating 
  acuate 
  spicules, 
  

   X 
  190. 
  From 
  type 
  specimen 
  from 
  Port 
  Molle. 
  

  

  d. 
  Clathria 
  tuherosa, 
  vertical 
  section, 
  x 
  38. 
  From 
  specimen 
  

  

  in 
  spirit 
  from 
  Prince 
  of 
  Wales 
  Channel. 
  

  

  e. 
  lotrochota 
  purpurea, 
  vertical 
  section, 
  and 
  e', 
  dermis, 
  x 
  

  

  20. 
  e". 
  Two 
  sizes 
  of 
  skeleton-spicule, 
  x 
  190. 
  e'". 
  Biro- 
  

   tulate 
  spicules, 
  x 
  370. 
  From 
  dry 
  specimen 
  from 
  Prince 
  

   of 
  Wales 
  Channel, 
  e"". 
  Two 
  ciliated 
  chambers, 
  from 
  

   specimen 
  of 
  green 
  var. 
  from 
  Amirante 
  Island, 
  x 
  370. 
  

  

  /. 
  /. 
  baculifera, 
  tibiella-spicule 
  of 
  dermis, 
  X 
  370. 
  From 
  

   type 
  specimen 
  from 
  Port 
  Darwin. 
  

  

  