﻿NOTES 
  ON 
  THE 
  ANATOMY 
  OF 
  GAZELLETTA. 
  483 
  

  

  Notes 
  on 
  the 
  Anatomy 
  of 
  Gazelletta. 
  

  

  By 
  

   O. 
  Herbert 
  Fowler, 
  B.A., 
  Ph.D., 
  F.Z.S., 
  F.I..S. 
  

  

  In 
  a 
  recent 
  paper 
  I 
  described, 
  as 
  completely 
  as 
  the 
  stale 
  of 
  

   preservation 
  of 
  the 
  material 
  would 
  permit, 
  the 
  anatomy 
  of 
  

   Planktonetta 
  atlantica, 
  Borgert/ 
  a 
  remarkable 
  type 
  of 
  

   Phseodarian 
  Radiolariau. 
  Associated 
  with 
  this 
  species 
  were 
  

   some 
  specimens 
  of 
  Gazelletta, 
  probably 
  G. 
  fragilis, 
  named 
  

   by 
  Dr. 
  Borgert 
  from 
  broken 
  material 
  obtained 
  by 
  the 
  

   National.- 
  I 
  am 
  obliged 
  to 
  him 
  for 
  permission 
  to 
  publish 
  a 
  

   short 
  note 
  upon 
  the 
  main 
  points 
  in 
  which 
  it 
  differs 
  from 
  

   Planktonetta. 
  As, 
  however, 
  this 
  organism 
  is 
  even 
  more 
  

   fragile, 
  and 
  therefore 
  worse 
  preserved 
  than 
  the 
  former, 
  and 
  

   as 
  my 
  specimens 
  were 
  fewer 
  in 
  number, 
  the 
  only 
  excuse 
  for 
  

   so 
  incomplete 
  an 
  account 
  lies 
  in 
  the 
  structural 
  novelty 
  of 
  the 
  

   interesting 
  family 
  (Medusettida) 
  to 
  which 
  it 
  belongs. 
  

  

  It 
  seems 
  probable 
  that 
  my 
  collection 
  included 
  at 
  least 
  two 
  

   species. 
  Of 
  five 
  specimens 
  cut 
  for 
  sections, 
  one 
  had 
  a 
  very 
  

   thick 
  body- 
  wall, 
  the 
  others 
  only 
  a 
  comparatively 
  thin 
  wail 
  ; 
  

   of 
  the 
  loose 
  bodies 
  found 
  in 
  the 
  material, 
  most 
  are 
  of 
  the 
  

   thick-walled 
  type. 
  The 
  anatomical 
  relations 
  seem, 
  however, 
  

   to 
  be 
  the 
  same 
  in 
  both 
  cases. 
  Fig. 
  2 
  is 
  taken 
  from 
  a 
  speci- 
  

   men 
  with 
  a 
  thill 
  capsule 
  ; 
  Fig. 
  1 
  from 
  one 
  with 
  a 
  thick 
  

   gelatinous 
  wall 
  ; 
  the 
  latter 
  type 
  appears 
  to 
  have 
  a 
  special 
  

   membrane 
  lining 
  the 
  interior, 
  of 
  which 
  no 
  trace 
  could 
  be 
  

   detected 
  in 
  the 
  former. 
  

  

  For 
  descriptive 
  purposes, 
  and 
  until 
  a 
  special 
  terminology 
  

  

  ' 
  ' 
  Quart., 
  Jouni. 
  Micr. 
  Sci.,' 
  xlvii,133. 
  

  

  " 
  ' 
  Zool. 
  Jalirbiiclier 
  (Abtli. 
  S^st. 
  u. 
  s. 
  w.),' 
  xvi, 
  570. 
  

  

  