﻿488 
  G. 
  HERBERT 
  FOWLER. 
  

  

  It 
  will 
  have 
  been 
  apparent 
  that 
  the 
  terms 
  of 
  orientation 
  

   used 
  in 
  describing 
  Planktonetta, 
  however 
  suitable 
  there, 
  are 
  

   really 
  inapplicable 
  to 
  Gazelletta 
  ; 
  nevertheless 
  they 
  have 
  

   been 
  used 
  in 
  these 
  notes 
  in 
  order 
  to 
  avoid 
  unnecessary 
  mul- 
  

   tiplication 
  of 
  temporary 
  terms. 
  Although 
  it 
  would 
  have 
  

   been 
  easy 
  to 
  coin 
  pseudo-classicisms 
  for 
  the 
  various 
  parts, 
  

   they 
  would 
  not 
  fit 
  the 
  anatomy 
  of 
  the 
  next 
  Medusettid 
  

   described, 
  should 
  it 
  differ 
  as 
  much 
  from 
  these 
  two 
  as 
  they 
  

   do 
  from 
  one 
  another. 
  What 
  really 
  is 
  the 
  shell-mouth 
  in 
  

   Planktonetta, 
  i. 
  e. 
  a 
  ring 
  round 
  the 
  point 
  of 
  ingestion, 
  is 
  in 
  

   Grazelletta 
  a 
  shell-cap 
  over 
  the 
  extra-capsular 
  protoplasm 
  ; 
  

   the 
  body-shell 
  of 
  Planktonetta 
  is 
  (apparently) 
  not 
  repre- 
  

   sented 
  in 
  Gazelletta; 
  and 
  the 
  terms 
  ''oral," 
  "aboral," 
  

   " 
  anterior," 
  " 
  posterior," 
  will 
  probably 
  have 
  to 
  be 
  altered 
  as 
  

   our 
  knowledge 
  of 
  the 
  family 
  increases. 
  The 
  fixed 
  point 
  in 
  

   both 
  seems 
  to 
  be 
  the 
  bundle 
  of 
  connecting 
  tubes. 
  At 
  present 
  

   it 
  appears 
  likely 
  that 
  the 
  intrinsic 
  shell 
  is 
  what 
  I 
  have 
  termed 
  

   the 
  shell-mouth 
  ; 
  this 
  may 
  cover 
  (Gazelletta) 
  or 
  encircle 
  

   (Planktonetta) 
  the 
  point 
  of 
  ingestion 
  ; 
  it 
  may 
  also 
  be 
  con- 
  

   tinued 
  aborally 
  so 
  as 
  to 
  surround 
  the 
  central 
  capsule 
  (Plank- 
  

   tonetta). 
  The 
  float 
  of 
  Planktonetta 
  is 
  doubtless 
  a 
  subsidiary 
  

   structure, 
  as 
  it 
  is 
  only 
  attached 
  by 
  the 
  spines 
  and 
  meshwork 
  

   to 
  the 
  central 
  shell. 
  

  

  