﻿8P0NGIIDA, 
  401 
  

  

  Tliis 
  species 
  hafl 
  a 
  great 
  resemblance 
  to 
  the 
  West-Indian 
  Tuha 
  

   sororia 
  of 
  iJiachassaing 
  de 
  Fonbressin 
  and 
  Michelotti, 
  but 
  differs 
  

   from 
  the 
  West-Indian 
  species 
  included 
  by 
  Schmidt 
  in 
  his 
  Siphono- 
  

   cTujIirM 
  papifracm, 
  of 
  which 
  T. 
  sororia 
  is 
  one, 
  in 
  having 
  the 
  spicuk-s 
  

   •OUO'i 
  millim. 
  and 
  upwards 
  thick, 
  instead 
  of 
  only 
  -002 
  to 
  -0042, 
  as 
  

   stated 
  by 
  Schmidt 
  for 
  those 
  species. 
  

  

  SIPHONOCHALINA, 
  Schmidt. 
  

  

  Although 
  afiparently 
  published 
  (Sjjong. 
  Kiist. 
  Alg, 
  p. 
  7) 
  as 
  dis- 
  

   tinct 
  from 
  Tvl,a 
  of 
  iJuch. 
  de 
  Fonbr. 
  and 
  Michelotti, 
  it 
  seems 
  to 
  be 
  

   coextensive 
  with 
  that 
  (older) 
  genus, 
  I 
  have, 
  however, 
  provisionally 
  

   retained 
  the 
  name 
  for 
  convenience, 
  for 
  a 
  few 
  forms 
  with 
  narrow, 
  

   thick-waUed 
  tubes, 
  like 
  those 
  of 
  the 
  type 
  species 
  S. 
  c/rriacea 
  (I. 
  c). 
  

  

  30, 
  Siphonochalina 
  tabulosa, 
  var. 
  

  

  Spongia 
  tubulosa, 
  Exper, 
  I'flMnzfnf.h. 
  IWrtielz. 
  i. 
  p. 
  190, 
  pi, 
  liv. 
  

  

  Siphonochalina 
  tubulo-ia, 
  Ehlern, 
  iJie 
  Efpernch. 
  Spony. 
  p. 
  19, 
  

  

  f" 
  Spongia 
  bullata 
  var. 
  ^, 
  Lamarck, 
  Ann. 
  Muh. 
  Hint. 
  Nat. 
  xx, 
  p. 
  4-37. 
  

  

  Small 
  colonies, 
  some 
  agreeing 
  well 
  with 
  Esper's 
  figure, 
  some 
  with 
  

   the 
  tubes 
  scarcely 
  rising 
  above 
  the 
  general 
  surface. 
  The 
  skeleton- 
  

   spicules 
  are 
  rather 
  longer 
  and 
  more 
  slender 
  than 
  is 
  indicated 
  by 
  

   Ehlers's 
  measurements, 
  viz. 
  '17 
  by 
  -000 
  millim, 
  (Ehlers 
  gives 
  -11 
  to 
  

   •13 
  by 
  '012 
  miUim,) 
  ; 
  the 
  smaller 
  ones 
  mentioned 
  by 
  him 
  are 
  

   obviously 
  young. 
  

  

  Several 
  specimens, 
  dr}' 
  and 
  in 
  spirit. 
  

  

  Hah. 
  Thursday 
  Island, 
  Channel 
  Eock, 
  Torres 
  Straits, 
  depth 
  ? 
  ; 
  

   Port 
  Molle, 
  Queensland, 
  " 
  beach," 
  

  

  Distribution, 
  Cape 
  of 
  Good 
  Hope 
  (Esper). 
  

  

  31, 
  Tuhulodigitus 
  communis. 
  

   Carter, 
  Ann. 
  4" 
  yJay. 
  N. 
  II. 
  (i>) 
  ix. 
  p. 
  307, 
  

  

  The 
  present 
  specimens, 
  preserved 
  in 
  spirit, 
  agree 
  sufficiently 
  with 
  

   Mr. 
  Carters 
  description 
  as 
  regards 
  external 
  characters. 
  The 
  colour 
  

   (in 
  spirit) 
  is 
  chiefly 
  a 
  dark 
  earthy 
  brown, 
  which 
  may 
  very 
  probably 
  

   have 
  been 
  altered 
  from 
  the 
  purj>le 
  described 
  by 
  Mr, 
  Carter, 
  The 
  

   fibre 
  is 
  strongly 
  homy, 
  slender, 
  and 
  very 
  flexible, 
  -OS-d 
  to 
  '042 
  

   millim, 
  in 
  diameter 
  in 
  the 
  case 
  of 
  the 
  primaries, 
  -028 
  to 
  -OSo 
  in 
  

   the 
  secondaries; 
  spicules 
  1- 
  to 
  3- 
  (rarely 
  4-) 
  serial 
  in 
  the 
  primaries, 
  

   1- 
  or 
  2-serial 
  in 
  the 
  secondaries. 
  In 
  Mr, 
  Carter's 
  specimens 
  the 
  

   spicules 
  appear 
  to 
  be 
  relatively 
  somewhat 
  more 
  abundant. 
  Colour 
  

   pale 
  amber-yellow. 
  Although 
  I 
  have 
  not 
  observed 
  in 
  these 
  speci- 
  

   mens 
  a 
  constant 
  difference 
  in 
  size 
  between 
  the 
  axial 
  and 
  peripheral 
  

   spicules 
  of 
  the 
  fibre, 
  such 
  as 
  that 
  which 
  Mr. 
  Carter 
  notices 
  (I.e.), 
  there 
  

   is, 
  nevertheless, 
  a 
  very 
  marked 
  dimorfjhism 
  in 
  the 
  spicules. 
  Between 
  

   those 
  of 
  the 
  commoner, 
  slender 
  acerate 
  form, 
  gradually 
  sharp-pointed, 
  

   size 
  '1 
  by 
  -OO.^ 
  millim., 
  are 
  intercalated 
  in 
  various 
  places 
  stouter 
  

   ones 
  of 
  similar 
  shape, 
  but 
  in 
  size 
  -14 
  by 
  "0063 
  millim., 
  and 
  they 
  

   sometimes 
  occur 
  by 
  the 
  side 
  of 
  the 
  slenderer 
  form. 
  From 
  the 
  

  

  2j) 
  

  

  