﻿26 
  G. 
  HKRBKRT 
  FOWLKU. 
  

  

  minute 
  objects 
  in 
  imperfectly 
  preserved 
  and 
  limited 
  material 
  

   is 
  considerable. 
  

  

  At 
  the 
  ti-ansforniation 
  of 
  soft 
  stalk 
  (g-ymnocaulus) 
  into 
  

   liai'd 
  stalk 
  (pectocaiilus) 
  the 
  high 
  ectoderm 
  spreads 
  round 
  

   three-quarters 
  of 
  the 
  circumference, 
  and 
  presumably 
  secretes 
  

   the 
  dark 
  brown 
  caulotheca^ 
  or 
  stalk-pipe 
  (fig. 
  8). 
  Still 
  

   further 
  posteriorly 
  the 
  caulotheca 
  invests 
  the 
  pectocaulus 
  

   completely, 
  the 
  mnscles 
  disappear, 
  and 
  the 
  soft 
  tissues 
  now 
  

   consist 
  of 
  a 
  central 
  core, 
  apparently 
  continuous 
  with 
  the 
  

   central 
  (? 
  endodermal) 
  core 
  of 
  the 
  g-ymnocaulus, 
  and 
  sur- 
  

   rounded 
  by 
  a 
  membrane 
  ; 
  it 
  is 
  certainly 
  flanked, 
  and 
  

   probably 
  entirely 
  suii-ounded, 
  by 
  pigmented 
  ectoderm-cells. 
  

  

  As 
  figs. 
  1 
  to 
  4 
  are 
  all 
  drawn 
  in 
  the 
  same 
  position 
  as 
  

   regards 
  the 
  polyp, 
  it 
  will 
  be 
  noticed 
  that 
  there 
  is 
  a 
  rotation 
  

   of 
  the 
  stalk 
  through 
  about 
  90°; 
  the 
  mesentery, 
  which 
  

   originally 
  lay 
  in 
  the 
  oro-anal 
  plane 
  of 
  the 
  polyp, 
  finally 
  

   comes 
  to 
  lie 
  right 
  and 
  left 
  as 
  regards 
  the 
  polyp-axis, 
  

   although 
  dorso-ventral 
  as 
  regards 
  the 
  colony. 
  This 
  may 
  be 
  

   accidental 
  (as 
  Mr. 
  Haimer 
  suggests), 
  but 
  is 
  at 
  any 
  rate 
  

   not 
  nn 
  usual. 
  

  

  IT. 
  The 
  Anatomy 
  of 
  a 
  Bud. 
  

  

  The 
  specimen 
  which 
  I 
  select 
  for 
  description 
  was 
  apparently 
  

   at 
  a 
  stage 
  intermediate 
  between 
  Nos. 
  6 
  and 
  7 
  of 
  Professor 
  

   Lankester's 
  fig. 
  3, 
  pi. 
  39, 
  in 
  that 
  the 
  lophophoral 
  arms 
  were 
  

   longer 
  than 
  in 
  No. 
  G, 
  but 
  had 
  not 
  yet 
  begun 
  to 
  develop 
  

   filaments. 
  It 
  has 
  been 
  drawn 
  as 
  fig. 
  18 
  of 
  this 
  paper. 
  The 
  

   pi'oboscis 
  or 
  epistome 
  is 
  large, 
  the 
  collar 
  region 
  small 
  and 
  only 
  

   slightly 
  larger 
  than 
  the 
  trunk, 
  the 
  trunk 
  indistinguishable 
  

   externally 
  from 
  the 
  gymnocaulus. 
  At 
  this 
  stage, 
  therefore, 
  

   the 
  long 
  axis 
  of 
  the 
  body 
  is 
  a 
  continuation 
  of 
  that 
  of 
  the 
  

   gymnocaulus 
  — 
  a 
  condition 
  unlike 
  that 
  of 
  the 
  adult 
  (cf. 
  

   Lankester, 
  op. 
  cit., 
  pi. 
  37, 
  fig. 
  1). 
  

  

  As 
  to 
  the 
  lophophoral 
  arms 
  and 
  upper 
  part 
  of 
  the 
  proboscis, 
  

   there 
  is 
  nothing 
  of 
  special 
  developmental 
  interest 
  to 
  say 
  ; 
  the 
  

   arms 
  simply 
  grow 
  out 
  from 
  the 
  collar 
  region, 
  and 
  contain 
  

   off-sets 
  of 
  the 
  collar 
  body-cavity 
  from 
  the 
  beginning. 
  

  

  