﻿150 
  COLLECTIONS 
  FROM 
  MELANESIA. 
  

  

  the 
  body. 
  Polian 
  vesicle 
  ? 
  Length 
  85, 
  62 
  millim. 
  ; 
  greatest 
  breadth 
  

   IT'S, 
  17'5 
  millim. 
  

  

  Port 
  Jackson. 
  

  

  Save 
  in 
  the 
  complete 
  absence 
  of 
  spicules 
  this 
  species 
  would 
  not 
  

   appear 
  to 
  have 
  any 
  resemblance 
  to 
  the 
  T. 
  inermls 
  of 
  Heller, 
  the 
  

   shorter 
  body 
  of 
  which, 
  attenuated 
  at 
  both 
  ends, 
  is 
  said 
  to 
  have 
  a 
  

   very 
  thin 
  integument 
  and 
  to 
  be 
  of 
  a 
  yellowish-grey 
  colour. 
  

  

  11. 
  Thyonidium 
  schmeltzii. 
  

  

  Ludtvig, 
  Semper^s 
  Arbeiten, 
  ii. 
  p. 
  94. 
  

  

  As 
  there 
  is 
  only 
  one 
  specimen 
  of 
  this 
  species, 
  I 
  have 
  been 
  obliged 
  

   to 
  content 
  myself 
  with 
  an 
  examination 
  of 
  the 
  integuments, 
  where 
  

   the 
  " 
  morgensternahnliche 
  Gebilde 
  " 
  were 
  found 
  iu 
  abundance 
  in 
  

   the 
  outer 
  layer. 
  

  

  Warrior 
  Reef, 
  Torres 
  Straits. 
  

  

  12. 
  Orcula 
  cucumiformis. 
  

   Semper, 
  Hoi. 
  p. 
  244. 
  

  

  Port 
  MoUe. 
  

  

  13. 
  Phyllophorus 
  proteus. 
  (Plate 
  IX. 
  figs. 
  F, 
  F'.) 
  

  

  Body 
  varying 
  greatly 
  in 
  form, 
  being 
  saccular, 
  swollen, 
  or 
  elon- 
  

   gated 
  ; 
  in 
  the 
  last 
  case 
  it 
  is 
  narrower 
  behind 
  than 
  in 
  front, 
  and 
  

   pretty 
  regularly 
  convex 
  above. 
  The 
  integument, 
  which 
  is 
  rather 
  

   thick, 
  may 
  be 
  black, 
  and 
  the 
  colour 
  rendered 
  more 
  marked 
  b)^ 
  the 
  

   lightness 
  of 
  the 
  suckers, 
  as 
  there 
  may 
  be 
  merel}' 
  dark 
  longitudinal 
  

   bands, 
  or 
  the 
  whole 
  body 
  may 
  be 
  greyish, 
  and 
  the 
  only 
  black 
  spots 
  

   the 
  tips 
  of 
  the 
  suckers. 
  The 
  suckers 
  themselves 
  always 
  have 
  a 
  

   wrinkled 
  appearance, 
  but 
  no 
  definite 
  statement 
  can 
  be 
  made 
  as 
  to 
  

   their 
  arrangement 
  on 
  the 
  body. 
  

  

  The 
  retractors 
  are 
  triangular 
  in 
  form 
  and 
  considerablj^ 
  enlarged 
  

   at 
  their 
  origin 
  ; 
  the 
  buccal 
  ring 
  is 
  well 
  developed, 
  the 
  radial 
  pieces 
  

   being 
  very 
  large, 
  and 
  the 
  interradial 
  dagger-shaped 
  ; 
  both 
  are 
  rather 
  

   deeply 
  excavated 
  above 
  (fig. 
  F'). 
  The 
  spicules 
  in 
  the 
  suckers 
  present 
  

   an 
  appearance 
  not 
  unlike 
  that 
  seen 
  in 
  the 
  zooglcea-stage 
  of 
  Bac- 
  

   terium 
  termo 
  ; 
  the 
  spicules 
  of 
  the 
  integument 
  are 
  more 
  or 
  less 
  four- 
  

   sided, 
  four-chambered 
  bodies, 
  made 
  up 
  of 
  somewhat 
  delicate 
  bars, 
  

   forming 
  a 
  trellis-work. 
  

  

  Port 
  MoUe 
  ; 
  Clairmont 
  and 
  Thursday 
  Islands 
  ; 
  Alert 
  Island 
  (7 
  fms., 
  

   sand). 
  

  

  14. 
  Stereoderma 
  validum. 
  (Plate 
  IX. 
  figs. 
  E, 
  a-f.) 
  

  

  Body 
  elongated, 
  tapering 
  more 
  at 
  its 
  posterior 
  than 
  at 
  its 
  anterior 
  

   end 
  ; 
  the 
  ventral 
  surface 
  a 
  little 
  convex, 
  the 
  dorsal 
  concave. 
  A 
  

  

  