﻿FIFTH 
  REPORT 
  OF 
  THE 
  DIRECTOR 
  I908 
  

  

  203 
  

  

  Professor 
  Hall 
  referred 
  orig-inally 
  to 
  his 
  O 
  1 
  d 
  h 
  a 
  m 
  i 
  a 
  

   c 
  o 
  s 
  a 
  intertwining 
  slender 
  branch- 
  

   es 
  which 
  have 
  been 
  separated 
  by 
  

   Professor 
  Whitfield 
  and 
  described 
  

   as 
  Chaetomorpha 
  ? 
  pri- 
  

   ma 
  [see 
  text 
  fig. 
  9, 
  10]. 
  A 
  speci- 
  

   men 
  on 
  the 
  same 
  slab 
  with 
  some 
  of 
  

   the 
  types 
  of 
  Callithamnop- 
  

   sis 
  fruticosa 
  reproduced 
  in 
  

   plate 
  I, 
  figure 
  4, 
  leaves, 
  however, 
  

   no 
  doubt 
  that 
  these 
  stems 
  twisted 
  

   together 
  are 
  but 
  branches 
  of 
  the 
  

   latter 
  species 
  which 
  in 
  drifting 
  

   have 
  become 
  stripped 
  of 
  the 
  

   branchlets 
  of 
  the 
  higher 
  orders 
  and 
  

   at 
  the 
  same 
  time 
  through 
  their 
  flac- 
  

   cidity 
  became 
  twisted 
  around 
  each 
  

   other. 
  

  

  The 
  specimen 
  here 
  figured 
  dem- 
  

   onstrates 
  at 
  the 
  same 
  time 
  that 
  the 
  

   main 
  branch 
  of 
  C. 
  fruticosa 
  

   bifurcated 
  once 
  or 
  twice, 
  the 
  result- 
  

   ing 
  branches 
  bearing 
  pairs 
  of 
  chaetomorpha 
  ? 
  prima 
  

   branchlets. 
  , 
  ^'''w^v:-.'i' 
  1 
  J^p^ 
  '^^""'^"'• 
  

  

  from 
  Whitfield) 
  

  

  Callithamnopsis 
  delicatula 
  sp. 
  no 
  v. 
  

  

  Plate 
  I, 
  figure 
  5; 
  plate 
  2, 
  figures 
  i, 
  2 
  

  

  Description. 
  Thallus 
  consisting 
  of 
  segmented 
  monopodial 
  or 
  

   bifurcating 
  main 
  branch 
  bearing 
  whorls 
  of 
  branchlets 
  which 
  in 
  

   their 
  turn 
  divide 
  repeatedly 
  in 
  whorls 
  of 
  branchlets 
  of 
  higher 
  order. 
  

   The 
  main 
  branch 
  is 
  apparently 
  bifurcated. 
  At 
  least 
  such 
  a 
  division 
  

   is 
  indicated 
  by 
  the 
  specimen 
  plate 
  2, 
  figure 
  i, 
  and 
  it 
  would 
  agree 
  

   with 
  the 
  bifurcation 
  of 
  the 
  main 
  branch 
  in 
  the 
  genotype. 
  It 
  is 
  

   segmented, 
  for 
  transverse 
  lines 
  that 
  alternate 
  with 
  the 
  whorls 
  are 
  

   seen 
  in 
  at 
  least 
  one 
  of 
  the 
  specimens 
  [pi. 
  i, 
  fig. 
  5]. 
  The 
  branch- 
  

   lets 
  of 
  the 
  next 
  order 
  are 
  somewhat 
  bulbous 
  at 
  their 
  bases 
  and 
  pro- 
  

   duce 
  an 
  annulation 
  of 
  the 
  main 
  branch. 
  To 
  some 
  extent 
  the 
  latter 
  

   is 
  also 
  seen 
  to 
  contract 
  between 
  the 
  whorls 
  [see 
  pi. 
  i. 
  fig. 
  5]. 
  

   The 
  branchlets 
  are 
  extremely 
  slender 
  and 
  flaccid 
  and 
  therefore 
  

   much 
  subjected 
  to 
  current 
  dragging 
  [see 
  pi. 
  2, 
  fig. 
  2]. 
  The 
  

   whorls 
  of 
  the 
  branchlets 
  of 
  higher 
  orders 
  are 
  far 
  apart 
  and 
  consist 
  

   only 
  of 
  three 
  or 
  four 
  branchlets. 
  Oh 
  account 
  of 
  their 
  length 
  the 
  

  

  