﻿EXPLANATION 
  OF 
  THE 
  PLATES. 
  667 
  

  

  Fig. 
  C. 
  Leptojorrjia 
  austral 
  icnsis, 
  var. 
  perfava, 
  type 
  specimen 
  (dry), 
  

   reduced 
  to 
  ^ 
  nat. 
  size. 
  C 
  Portion 
  of 
  main 
  axis 
  of 
  same, 
  

   from 
  about 
  4 
  inches 
  above 
  base, 
  with 
  origin 
  of 
  three 
  pin- 
  

   nules, 
  showing 
  the 
  relations 
  of 
  the 
  grooves 
  and 
  verrucae, 
  

   x2. 
  c, 
  larger, 
  and 
  c', 
  smaller 
  fusiform 
  spicules, 
  x 
  150. 
  

  

  D. 
  JunceUa 
  fragilis. 
  Portion 
  of 
  stem, 
  x 
  2|. 
  From 
  dry 
  speci- 
  

  

  men 
  from 
  Port 
  Denison, 
  4 
  fms. 
  

  

  E. 
  Muricea 
  tenera, 
  nat, 
  size. 
  E'. 
  Portion 
  of 
  second 
  branch 
  

  

  on 
  the 
  left, 
  x 
  4. 
  e. 
  Cortical 
  spicule, 
  x 
  25. 
  e' 
  . 
  Portion 
  

   of 
  same 
  spicule, 
  much 
  magnified, 
  to 
  show 
  character 
  of 
  

   tubercles. 
  From 
  specimen 
  in 
  spirit 
  from 
  Port 
  Molle, 
  

   14 
  fms. 
  

  

  F. 
  Plexaura 
  prctilonga, 
  var. 
  tupica. 
  Portion 
  of 
  one 
  of 
  the 
  

  

  two 
  main 
  branches, 
  an 
  inch 
  above 
  the 
  point 
  of 
  bifurcation, 
  

   x4. 
  From 
  dry 
  specimen 
  from 
  Port 
  Curtis, 
  5-11 
  fms. 
  

  

  Plate 
  XXXVII. 
  

  

  Fig. 
  A. 
  Spongodes 
  studeri, 
  two 
  terminal 
  lobes, 
  x2; 
  A', 
  portion 
  

   of 
  lobule, 
  X 
  4 
  : 
  both 
  from 
  specimen 
  in 
  spirit 
  from 
  Port 
  

   Molle, 
  14 
  fms. 
  a. 
  Id., 
  var. 
  lievior, 
  long 
  zooid-spicule, 
  

  

  X 
  30, 
  and 
  portion 
  of 
  same, 
  x 
  90, 
  showiug 
  axial 
  cavity 
  

   occupied 
  by 
  soft 
  material, 
  a. 
  Cortical 
  spicule 
  of 
  same, 
  

  

  X 
  20, 
  and 
  portion, 
  x 
  90, 
  showing 
  canals 
  radiating 
  from 
  

   tubercles 
  to 
  centre, 
  a". 
  Lesser 
  zooid-spicule 
  of 
  same, 
  

  

  X 
  90. 
  The 
  spicules 
  are 
  from 
  a 
  specimen 
  from 
  Arafura 
  Sea. 
  

  

  B. 
  Mopsella 
  clavigera. 
  Portion 
  of 
  small 
  specimen, 
  near 
  middle, 
  

  

  about 
  halfway 
  upwards 
  from 
  base, 
  front 
  view, 
  X 
  2. 
  From 
  

   dry 
  specimen 
  from 
  Port 
  Curtis, 
  14 
  fms. 
  

  

  C. 
  Melitodes 
  albitincta, 
  type 
  (dry) 
  specimen, 
  seen 
  from 
  front, 
  nat. 
  

  

  size. 
  C. 
  Fifth 
  bifurcation 
  of 
  main 
  stem 
  of 
  same 
  specimen, 
  

   X 
  4. 
  C" 
  & 
  C". 
  Smaller 
  and 
  larger 
  forms 
  of 
  verrucae 
  of 
  

   same, 
  showing 
  8 
  lobes 
  of 
  verruca-wall 
  and 
  8 
  tentacular 
  

   lobes 
  within, 
  x 
  6. 
  

  

  D. 
  Psilacahar'ia 
  graciUima. 
  D 
  and 
  D'. 
  Two 
  dry 
  fragments, 
  

  

  probably 
  from 
  near 
  base 
  of 
  specimen 
  or 
  specimens, 
  x 
  2. 
  

  

  