﻿•1S6 
  G. 
  HERBERI' 
  FOWLER. 
  

  

  protoplasm 
  is 
  of 
  the 
  same 
  character 
  as 
  in 
  Planktoiietta, 
  but 
  

   the 
  suspensory 
  processes 
  are 
  fewer 
  and 
  more 
  slender. 
  The 
  

   shell-mouth 
  (to 
  use 
  temporarily 
  the 
  same 
  term 
  as 
  in 
  

   Planktonetta) 
  has 
  been 
  figured 
  by 
  Dr. 
  Borgert 
  (op. 
  cit.) 
  ; 
  

   having 
  only 
  the 
  head 
  before 
  him, 
  he 
  made 
  the 
  natural 
  

   mistake 
  of 
  thinking 
  that 
  the 
  larger 
  opening 
  was 
  oral, 
  the 
  

   smaller 
  (if 
  it 
  really 
  exist) 
  aboral 
  ; 
  but 
  the 
  reverse 
  is 
  the 
  case, 
  

   and 
  his 
  figure 
  is 
  drawn 
  from 
  the 
  "oral" 
  aspect. 
  I 
  am 
  not 
  

   convinced 
  that 
  the 
  smaller 
  opening 
  has 
  a 
  real 
  existence, 
  but 
  

   I 
  incline 
  to 
  think 
  that 
  in 
  life 
  it 
  is 
  occupied 
  by 
  a 
  thin 
  film 
  of 
  

   shell, 
  which 
  disappears 
  in 
  the 
  process 
  of 
  cleaning. 
  If 
  

   present, 
  it 
  is 
  certainly 
  not 
  the 
  mouth, 
  as 
  will 
  appear 
  shortly. 
  

  

  Fig. 
  3. 
  — 
  Tlie 
  central 
  ends 
  of 
  two 
  arms 
  projecting 
  out 
  from 
  under 
  tlie 
  

   protoplasm, 
  showing 
  the 
  skeletal 
  meshwork. 
  

  

  The 
  large 
  "aboral" 
  opening 
  is 
  closed 
  below 
  by 
  a 
  fibrous 
  

   diaphragm; 
  the 
  circumference 
  of 
  this 
  is 
  not 
  inserted 
  into 
  

   pits 
  of 
  the 
  shell-mouth, 
  as 
  in 
  Planktonetta, 
  but 
  is 
  apparently 
  

   attached 
  to, 
  or 
  continuous 
  with, 
  a 
  skeletal 
  meshwork 
  

   developed 
  between 
  the 
  aborally 
  directed 
  arms. 
  Into 
  this 
  

   diaphragm 
  are 
  inserted 
  the 
  suspensory 
  processes 
  of 
  the 
  intra- 
  

   capsular 
  protoplasm, 
  and 
  it 
  is 
  perforated 
  by 
  the 
  communica- 
  

   ting 
  tubes. 
  

  

  The 
  shell-mouth 
  is 
  slightly 
  saddle 
  shaped, 
  the 
  lappets 
  of 
  

   the 
  saddle 
  lying 
  right 
  and 
  left 
  of 
  the 
  organism, 
  but 
  its 
  rim 
  

   is 
  raised 
  a 
  little 
  anteriorly.^ 
  

  

  The 
  arms, 
  according 
  to 
  Dr. 
  Borgert, 
  ai-e 
  8 
  — 
  10 
  in 
  number, 
  

   in 
  my 
  cleaned 
  specimens 
  10 
  — 
  13. 
  The 
  anterior 
  pair 
  are 
  

  

  ^ 
  In 
  Dr. 
  Borgert's 
  drawing 
  the 
  right 
  side 
  of 
  the 
  structure 
  is 
  lowest 
  in 
  the 
  

   figure; 
  the 
  " 
  anterior 
  " 
  edge 
  is 
  on 
  the 
  right 
  of 
  the 
  figure. 
  

  

  