﻿414 
  COLLECTIONS 
  FKOM 
  ilEL.VNESIA. 
  

  

  into 
  the 
  sponge, 
  agrees 
  fairly 
  with 
  this 
  species. 
  Sponge 
  30 
  millim. 
  

   long, 
  20 
  millim. 
  high, 
  10 
  millim. 
  in 
  greatest 
  thickness. 
  The 
  

   main-skeleton 
  lines 
  are 
  somewhat 
  more 
  abundantly 
  spicular. 
  

  

  Eah. 
  The 
  first 
  specimen, 
  Port 
  Curtis, 
  Queensland, 
  11 
  fms. 
  ; 
  the 
  

   latter 
  specimen. 
  Port 
  Darwin. 
  

  

  49. 
  Pellina 
  eusiphonia. 
  (Plate 
  XLI. 
  fig. 
  x.) 
  

  

  Massive, 
  sessile, 
  horizontal 
  in 
  growth. 
  Surface 
  even, 
  smooth. 
  

   Yents 
  formed 
  by 
  prominent 
  thin-walled 
  tubes, 
  3 
  to 
  4 
  millim. 
  in 
  

   diameter, 
  ranging 
  in 
  length 
  up 
  to 
  12 
  millim., 
  numerous, 
  aggregated 
  

   on 
  upper 
  surface 
  of 
  sponge, 
  anastomosing 
  with 
  each 
  other 
  ; 
  thickness 
  

   of 
  wall 
  about 
  '2 
  millim. 
  Texture 
  in 
  spirit 
  — 
  basal 
  portion 
  firm, 
  rather 
  

   brittle 
  ; 
  of 
  vents 
  soft, 
  very 
  yielding 
  ; 
  colour 
  in 
  spirit 
  dull 
  pinkish 
  

   brown. 
  Main 
  skeleton 
  — 
  no 
  visible 
  horny 
  matter, 
  spicules 
  loosely 
  

   aggregated 
  in 
  fibres 
  ; 
  primary 
  fibres 
  vertical 
  to 
  surface, 
  '28 
  to 
  

   •42 
  millim. 
  apart, 
  3 
  to 
  5 
  spicules 
  broad 
  ; 
  secondary 
  fibres 
  approxi- 
  

   mately 
  vertical 
  to 
  primaries, 
  about 
  '2'6 
  to 
  '42 
  millim. 
  apart, 
  2 
  to 
  5 
  

   spicules 
  broad. 
  Dermal 
  skeleton 
  composed 
  of 
  long 
  subparallel 
  

   spiculo-fibres, 
  rather 
  compact, 
  without 
  visible 
  horny 
  material, 
  3 
  to 
  

   10 
  spicules 
  broad, 
  '53 
  to 
  '7 
  millim. 
  apart 
  ; 
  the 
  intermediate 
  spaces 
  

   are 
  occupied 
  by 
  an 
  irregular 
  1-2-spicular 
  network. 
  Subjacent 
  

   sarcode 
  transparent, 
  pale 
  brown; 
  that 
  of 
  dermis 
  almost 
  colourless, 
  

   pinkish. 
  Spicules 
  smooth 
  acerate, 
  tapering 
  to 
  moderately 
  sharp 
  

   points 
  from 
  within 
  about 
  two 
  diameters 
  of 
  ends 
  ; 
  size 
  -33 
  by 
  '0125 
  

   to 
  -019 
  millim. 
  

  

  Hab. 
  Port 
  Darwin, 
  between 
  tide-marks 
  ; 
  bottom 
  rock 
  and 
  

   sand. 
  

  

  The 
  specimen 
  is 
  an 
  irregularly 
  flattened 
  mass, 
  75 
  millim. 
  (3 
  inches) 
  

   long, 
  35 
  millim. 
  broad, 
  20 
  millim. 
  in 
  greatest 
  thickness, 
  and 
  involves 
  

   several 
  stones 
  in 
  its 
  substance. 
  The 
  peculiar 
  arrangement 
  of 
  the 
  

   excretory 
  tubes 
  distinguishes 
  it 
  from 
  any 
  species 
  which 
  I 
  can 
  

   find 
  described. 
  In 
  the 
  allied 
  form 
  Pdlina 
  semituhulosa, 
  Lieber- 
  

   klihn 
  (Schmidt, 
  Adr. 
  Meer. 
  p. 
  75 
  ; 
  Atl. 
  Geb. 
  p. 
  41), 
  perhaps 
  the 
  

   most 
  nearly 
  related 
  described 
  species, 
  the 
  spicules 
  taper 
  very 
  gra- 
  

   dually 
  to 
  sharp 
  points, 
  as 
  in 
  Amorpluna 
  paiiicea, 
  Johnston, 
  and 
  

   measure 
  "38 
  to 
  '44 
  by 
  -01 
  millim., 
  and 
  no 
  true 
  vent-tubes 
  seem 
  to 
  

   be 
  formed 
  either 
  in 
  this 
  or 
  in 
  the 
  other 
  species 
  referred 
  to 
  Pellina 
  

   by 
  Schmidt. 
  

  

  50. 
  Protoschmidtia 
  hispidula. 
  (Plate 
  XLI. 
  figs. 
  ^,p'.) 
  

  

  Erect, 
  lobose, 
  nodular, 
  the 
  subcylindrical 
  lobes 
  have 
  a 
  slight 
  

   tendency 
  to 
  branch 
  sideways 
  and 
  a 
  strong 
  tendency 
  to 
  anastomose 
  ; 
  

   lobes 
  about 
  4 
  to 
  6 
  millim. 
  in 
  diameter. 
  Growth 
  bushy 
  (i. 
  e. 
  in 
  

   more 
  than 
  one 
  plane). 
  Surface 
  beset 
  with 
  a 
  velvet-like 
  pile 
  of 
  fine 
  

   hair-like 
  points, 
  -5 
  to 
  1 
  millim. 
  apart 
  and 
  about 
  "25 
  to 
  -75 
  millim. 
  

   high 
  ; 
  between 
  points, 
  leathery 
  and 
  glabrous. 
  Vents 
  '? 
  Texture 
  

   in 
  spirit 
  elastic 
  and 
  fairly 
  compressible, 
  tough 
  ; 
  colour 
  dark 
  reddish 
  

   brown. 
  Main 
  skeleton 
  consisting 
  of 
  spiculo-fibre 
  4 
  to 
  6 
  spicules 
  

   broad, 
  closely 
  but 
  not 
  firmly 
  united 
  ; 
  numerous 
  short 
  parallel 
  

  

  