﻿412 
  COLLECTIONS 
  FROM 
  MELANESLV. 
  

  

  wide 
  apart, 
  vertical 
  to 
  surface, 
  3 
  to 
  8 
  spicules 
  broad 
  ; 
  secondaries 
  

   at 
  less 
  intervals, 
  3 
  to 
  6 
  spicules 
  broad 
  ; 
  the 
  interstices 
  occupied 
  by 
  

   much 
  irregular 
  1- 
  or 
  2- 
  serial 
  network. 
  Dermal 
  skeleton 
  of 
  stout 
  

   spiculo-fibre, 
  similar 
  to 
  that 
  of 
  main 
  skeleton 
  ; 
  the 
  spicules 
  3- 
  to 
  

   8-serial, 
  forming 
  a 
  network 
  of 
  subrectangular 
  meshes, 
  '4 
  to 
  •? 
  millim. 
  

   wide, 
  enclosing 
  detached 
  or 
  loosely 
  aggregated 
  spicules. 
  Sarcode 
  very 
  

   pale 
  yellowish 
  brown, 
  slightly 
  granular. 
  Spicules 
  smooth 
  acerate, 
  

   slightly 
  and 
  gradually 
  curved, 
  tapering 
  to 
  sharp 
  points 
  from 
  about 
  

   three 
  diameters 
  from 
  ends 
  (varieties 
  occur 
  having 
  one 
  end 
  tapering- 
  

   more 
  or 
  less 
  to 
  a 
  blunt 
  rounded 
  extremity, 
  or 
  with 
  one 
  end 
  rounded 
  

   and 
  as 
  stout 
  as 
  the 
  middle 
  of 
  the 
  spicule, 
  thus 
  becoming 
  truly 
  

   acuatc) 
  ; 
  size 
  '2 
  by 
  •0127 
  millim. 
  

  

  Bah. 
  Port 
  Darwin, 
  7 
  fms. 
  ; 
  bottom 
  sand. 
  

  

  This 
  species 
  is 
  perhaps 
  allied 
  to 
  Reniera 
  aquceduchts. 
  It 
  differs 
  

   from 
  that 
  species 
  in 
  the 
  anastomosing 
  and 
  externally 
  spinous 
  tubes 
  

   and 
  in 
  the 
  superior 
  diameter 
  of 
  the 
  spicule, 
  which 
  does 
  not 
  exceed 
  

   •0095 
  millim. 
  in 
  that 
  species. 
  The 
  specimen 
  forms 
  a 
  low 
  hedge-like 
  

   series 
  of 
  anastomosing 
  tubes, 
  which 
  are 
  almost 
  horizontal 
  at 
  their 
  

   lower 
  ends 
  ; 
  maximum 
  height 
  of 
  colony 
  55 
  millim. 
  (2Jl 
  inches), 
  

   maximum 
  lateral 
  extent 
  100 
  millim. 
  (4 
  inches). 
  It 
  has 
  a 
  remarkable 
  

   external 
  resemblance 
  to 
  a 
  form 
  of 
  the 
  Chalinid, 
  Tuba 
  ac^qjulcensis, 
  

   Carter. 
  

  

  46. 
  Pellina 
  aliformis. 
  (Plate 
  XXXIX. 
  fig. 
  ; 
  

   Plate 
  XLI. 
  fig. 
  «-.) 
  

  

  Erect, 
  with 
  slender 
  pedicle 
  ; 
  expanding 
  into 
  one 
  or 
  more 
  wing-like 
  

   lobes, 
  4 
  to 
  6 
  millim. 
  thick, 
  14 
  to 
  20 
  millim. 
  in 
  greatest 
  width 
  ; 
  the 
  

   free 
  edges 
  looking 
  upwards 
  and 
  downwards 
  respectively 
  and 
  the 
  apex 
  

   directed 
  horizontally. 
  Surface 
  more 
  or 
  less 
  roughened 
  (especially 
  

   on 
  the 
  flat 
  surface 
  of 
  the 
  lobes) 
  by 
  the 
  conuli, 
  about 
  •G 
  millim. 
  

   apart, 
  which 
  enclose 
  the 
  ends 
  of 
  the 
  primary 
  skeleton-fibres 
  ; 
  the 
  

   margins 
  of 
  the 
  lobes, 
  and 
  sometimes 
  their 
  sides, 
  are 
  covered 
  by 
  a 
  

   glabrous 
  semitransparent 
  membrane. 
  Vents 
  few, 
  suboval, 
  2 
  millim. 
  

   in 
  greatest 
  diameter, 
  with 
  thin 
  membranous 
  margins, 
  generally 
  

   placed 
  on 
  the 
  edges 
  of 
  the 
  lobes; 
  their 
  cavity 
  oblique, 
  entered 
  by 
  

   numerous 
  excretory 
  canals. 
  Texture 
  in 
  spirit 
  brittle, 
  slightly 
  

   elastic 
  ; 
  colour 
  very 
  pale 
  brown. 
  

  

  Main 
  skeleton 
  — 
  spiculo-fibres 
  loose, 
  no 
  perceptible 
  horny 
  uniting 
  

   substance 
  ; 
  primary 
  fibres 
  approximately 
  vertical 
  to 
  surface, 
  '6 
  to 
  

   •85 
  millim. 
  apart, 
  8 
  to 
  10 
  spicules 
  broad 
  ; 
  secondary 
  fibres 
  at 
  

   various 
  angles 
  to 
  primaries, 
  at 
  some 
  distance 
  apart, 
  about 
  5 
  spicules 
  

   broad. 
  Dermal 
  skeleton 
  thick, 
  formed 
  of 
  very 
  loose 
  spicular 
  tracts 
  

   of 
  various 
  sizes, 
  crossing 
  each 
  other 
  at 
  various 
  angles, 
  leaving 
  small 
  

   spaces 
  between 
  them. 
  Sarcode 
  rather 
  granular, 
  pale 
  brown. 
  Spicules 
  

   smooth 
  acerate, 
  slightly 
  curved, 
  tapering 
  to 
  sharp 
  points 
  from 
  near 
  

   centre 
  ; 
  size 
  ^5 
  by 
  ^025 
  millim. 
  

  

  JIab. 
  Port 
  Darwin, 
  8-12 
  fms. 
  ; 
  bottom 
  sand 
  and 
  mud. 
  

  

  lleprescntcd 
  by 
  one 
  whole 
  specimen 
  and 
  one 
  fragment, 
  in 
  spirit. 
  

   The 
  former 
  33 
  millim. 
  high 
  by 
  about 
  the 
  same 
  wide, 
  and 
  formed 
  

  

  