﻿EXPLANATION 
  OF 
  THE 
  PLATES. 
  669 
  

  

  Fig. 
  B. 
  Stelispongiis 
  implexus. 
  The 
  most 
  symmetrical 
  of 
  three 
  

   specimens 
  from 
  coral-reef, 
  Port 
  MoUc 
  ; 
  dry. 
  Nat. 
  size. 
  

  

  C. 
  Sijihonochallna 
  buUata. 
  Left-hand 
  half 
  of 
  largest 
  dry 
  speci- 
  

  

  men 
  from 
  Port 
  Curtis, 
  showing 
  two 
  completed 
  tubes, 
  and 
  

   behind 
  them 
  (c) 
  the 
  margin 
  of 
  an 
  incomplete 
  one. 
  Eeduced 
  

   two 
  thirds 
  nat. 
  size. 
  

  

  D. 
  lieniera 
  iestucUnaria. 
  Small 
  part 
  of 
  large 
  dry 
  specimen 
  from 
  

  

  4 
  fms.. 
  Port 
  Denison, 
  showing 
  the 
  lobes 
  and 
  ridges 
  which 
  

   characterize 
  the 
  surface 
  of 
  the 
  species. 
  Reduced 
  to 
  two 
  

   thirds 
  nat. 
  size. 
  

  

  E. 
  Bhizoclialina 
  spaihulifera. 
  The 
  type 
  (dry) 
  specimen 
  from 
  

  

  Thursday 
  Island, 
  4-5 
  fms. 
  Reduced 
  to 
  two 
  thirds 
  nat. 
  

   size. 
  [The 
  lower 
  part 
  overrun 
  by 
  the 
  filiform 
  stolons 
  of 
  a 
  

   Hydroid 
  Zoophyte.] 
  

  

  F. 
  B. 
  canalis. 
  Dry 
  specimen, 
  one 
  of 
  the 
  types, 
  from 
  Port 
  Dar- 
  

  

  win, 
  8-12 
  fms. 
  [The 
  lower 
  end 
  of 
  the 
  figure 
  shows 
  that 
  one 
  

   end 
  of 
  the 
  canaliform 
  Sponge 
  has 
  been 
  broken 
  off 
  and 
  the 
  

   centre 
  of 
  the 
  specimen 
  coated 
  by 
  a 
  calcareous 
  Polyzoon 
  

   {Cellepora).^ 
  Reduced 
  to 
  two 
  thirds 
  nat. 
  size. 
  

  

  G. 
  Toccochalina 
  robusta. 
  Terminal 
  branches 
  of 
  a 
  spirit-speci- 
  

  

  men 
  from 
  Port 
  Jackson 
  ; 
  upper 
  surface, 
  showing 
  vents. 
  

   Reduced 
  to 
  two 
  thirds 
  nat. 
  size. 
  

  

  H. 
  Cladochalina 
  suharmigera. 
  Part 
  of 
  a 
  specimen 
  in 
  spirit 
  

   from 
  Warrior 
  Reef, 
  Torres 
  Straits, 
  seen 
  from 
  above, 
  

   showing 
  vents 
  and 
  short 
  and 
  scanty 
  spines. 
  Nat. 
  size. 
  

  

  I. 
  Gelliodes 
  Jihulata. 
  One 
  of 
  the 
  larger 
  and 
  more 
  ramose 
  

   specimens, 
  exhibiting 
  several 
  anastomoses 
  of 
  the 
  branches. 
  

   Dry 
  ; 
  from 
  Thursday 
  Island, 
  3-5 
  fms. 
  Reduced 
  to 
  two 
  

   thirds 
  nat. 
  size. 
  

  

  J. 
  PelVina 
  murlcata. 
  Part 
  of 
  the 
  type 
  specimen, 
  in 
  spirit, 
  from 
  

   Port 
  Darwin, 
  between 
  tide-marks, 
  showing 
  serial 
  arrange- 
  

   ment 
  of 
  the 
  hispid 
  cloacal 
  tubes 
  to 
  form 
  a 
  wall-like 
  ridge. 
  

   Nat. 
  size. 
  

  

  K. 
  lihaiJiidoiMus 
  procerus. 
  The 
  largest 
  spirit-specimen 
  from 
  

   Port 
  Darwin, 
  7-12 
  fms. 
  [The 
  basal 
  portion 
  includes 
  a 
  

  

  