﻿EXPLANATION 
  OF 
  THE 
  PLATES. 
  

  

  677 
  

  

  Fig. 
  i. 
  Stelletta 
  clavosa, 
  acerate, 
  anclioring 
  quadriracliate, 
  and 
  zone 
  

   spicules, 
  x68. 
  i' 
  , 
  head 
  of 
  zone- 
  spicule, 
  as 
  seen 
  from 
  

   above, 
  x 
  68 
  ; 
  i" 
  , 
  stellate 
  flesh-spicules, 
  X 
  370. 
  From 
  type 
  

   specimen 
  from 
  Prince 
  of 
  Wales 
  Channel. 
  

   j. 
  8. 
  purpurea, 
  acerate, 
  anchoring 
  quadriradiate, 
  and 
  zoue- 
  

   spicules, 
  x68. 
  /, 
  stellate 
  flesh-spicules, 
  x370. 
  From 
  

   type 
  specimen 
  from 
  Torres 
  Straits. 
  

   Tc. 
  S. 
  purpurea, 
  var. 
  retrojlexa, 
  the 
  zone-spicule, 
  X 
  68. 
  From 
  

   specimen 
  from 
  Torres 
  Straits. 
  

  

  I. 
  Tefhyopsis 
  dissimilis, 
  diagrammatic 
  vertical 
  section 
  * 
  across 
  

   upper 
  end 
  of 
  larger 
  t 
  specimen 
  from 
  Port 
  Darwin, 
  X 
  about 
  

   2. 
  v. 
  The 
  same* 
  of 
  smaller 
  specimen 
  from 
  Port 
  Darwin, 
  

   X 
  about 
  3 
  [the 
  dark 
  parts 
  represent 
  canals, 
  the 
  dotted 
  

   portions 
  those 
  occupied 
  by 
  the 
  skeleton 
  and 
  tissues 
  in 
  the 
  

   Sponge 
  itself]. 
  I". 
  Portion 
  of 
  dermis 
  + 
  from 
  between 
  two 
  

   longitudinal 
  skeletal 
  lines, 
  from 
  larger 
  specimen 
  from 
  

   Port 
  Darwin, 
  as 
  seen 
  from 
  inside, 
  x 
  about 
  25. 
  I'". 
  Part 
  

   of 
  septum 
  between 
  two 
  large 
  canals, 
  from 
  same 
  specimen, 
  

   X 
  about 
  25. 
  I"". 
  Skeleton 
  triradiate 
  spicules, 
  one 
  normal, 
  

   the 
  other 
  with 
  abnormally 
  elongated 
  third 
  ray, 
  X 
  34. 
  

   T"". 
  Acerate 
  spicule 
  from 
  small 
  Port-Darwin 
  specimen, 
  

   and 
  Z""", 
  from 
  Torres-Straits 
  specimen, 
  x 
  34. 
  Z"""'.Flesh- 
  

   fepicules 
  from 
  larger 
  specimen 
  from 
  Port 
  Darwin, 
  x 
  850. 
  

   m. 
  Leucaliis 
  hathyhia, 
  var. 
  australiensis, 
  tri- 
  and 
  quadri- 
  

   radiate 
  spicules 
  of 
  outer 
  surface 
  ; 
  m', 
  triradiate 
  from 
  

   centre 
  of 
  wall 
  ; 
  m", 
  quadriradiates 
  of 
  subjacent 
  parts. 
  All 
  

   X 
  68. 
  From 
  type 
  specimen 
  from 
  Port 
  Jackson. 
  

  

  n. 
  Btellettinopsis 
  carteri, 
  the 
  skeleton-spicule, 
  X 
  68. 
  n 
  , 
  the 
  

   larger, 
  and 
  n" 
  , 
  the 
  smaller 
  stellates, 
  x 
  370. 
  From 
  type 
  

   specimen 
  from 
  Torres 
  Straits. 
  

  

  * 
  Canals— 
  \, 
  anterior; 
  2, 
  posterior; 
  3 
  and 
  4, 
  lateral; 
  5 
  and 
  6, 
  antero- 
  

   lateral 
  ; 
  7 
  and 
  8, 
  postero-lateral 
  ; 
  9 
  (in 
  I), 
  axial. 
  

  

  f 
  iVbi'e.— 
  Since 
  writing 
  the 
  account 
  of 
  the 
  canals 
  (given 
  at 
  p. 
  478 
  of 
  Part 
  I. 
  

   of 
  the 
  Report), 
  I 
  have 
  dispovered 
  that 
  the 
  apparently 
  single 
  pair 
  of 
  lateral 
  spaces 
  

   in 
  the 
  larger 
  specimen 
  is 
  in 
  reality 
  double. 
  

  

  X 
  Showing 
  that 
  the 
  long 
  arm 
  of 
  the 
  skeleton-spicule 
  commonly 
  extends 
  over 
  

   ttvo 
  interfascicular 
  spaces, 
  and 
  is 
  not 
  confined 
  to 
  one 
  as 
  stated 
  in 
  the 
  description 
  

   at 
  p. 
  477. 
  

  

  