﻿PLATE 
  XT. 
  

  

  Fig. 
  1. 
  — 
  Frontal 
  section 
  No. 
  10, 
  through 
  the 
  head 
  of 
  second 
  or 
  last 
  pupal 
  stage 
  of 
  C. 
  spre- 
  

   tus, 
  passing 
  through 
  the 
  middle 
  of 
  the 
  brain, 
  the 
  optic 
  ganglion, 
  and 
  eyes, 
  and 
  

   cutting 
  across 
  the 
  oesophagus. 
  Drawn 
  in 
  order 
  to 
  show 
  the 
  relation 
  of 
  the 
  

   brain 
  to 
  the 
  eyes 
  and 
  the 
  exterior 
  of 
  the 
  head 
  ; 
  magnified 
  30 
  diameters. 
  In 
  

   the 
  brain 
  the 
  right 
  mushroom 
  body 
  is 
  seen, 
  while 
  the 
  optic 
  and 
  antennal 
  

   lobes 
  are 
  not 
  so 
  well 
  marked. 
  The 
  central 
  body 
  (centr. 
  b.) 
  is 
  cut 
  through 
  

   near 
  the 
  middle; 
  below 
  are 
  the 
  trabecule 
  (trab.), 
  next 
  to 
  the 
  commissural 
  

   lobes, 
  two 
  tracheae 
  ( 
  tr. 
  ) 
  or 
  air- 
  tubes 
  passing 
  near 
  the 
  brain. 
  The 
  commissure 
  

   to 
  the 
  subcesophageal 
  ganglion 
  is 
  drawn 
  on 
  the 
  right 
  side, 
  passing 
  down 
  

   the 
  oesophagus. 
  In 
  the 
  eye 
  the 
  cornea, 
  the 
  respective 
  portions 
  composed 
  

   of 
  rods 
  and 
  cones, 
  the 
  black 
  retina, 
  the 
  stratum 
  of 
  optic 
  nervules, 
  and 
  the 
  

   optic 
  ganglion 
  and 
  optic 
  nerve 
  passing 
  off 
  from 
  the 
  optic 
  lobe 
  are 
  all 
  well 
  

   marked. 
  

  

  Fig. 
  2. 
  — 
  Section 
  through 
  the 
  brain 
  and 
  eyes 
  of 
  the 
  same 
  second 
  pupa 
  of 
  C. 
  spreius, 
  

   passing 
  through 
  the 
  anterior 
  part 
  of 
  the 
  calices, 
  but 
  not 
  through 
  the 
  cen- 
  

   tral 
  body. 
  The 
  section 
  is 
  oblique 
  and 
  does 
  not 
  well 
  represent 
  the 
  right 
  

   side. 
  

  

  Fig. 
  3. 
  — 
  Calyx 
  of 
  the 
  section 
  represented 
  by 
  Fig. 
  2 
  ; 
  magnified 
  225 
  diameters. 
  It 
  is 
  

   composed 
  of 
  granulated 
  nerve 
  substance 
  with 
  a 
  few 
  fibers, 
  the 
  continua- 
  

   tion 
  of 
  those 
  of 
  the 
  stalk, 
  and 
  with 
  a 
  few 
  ganglion 
  cells. 
  

  

  FlG. 
  4. 
  — 
  Section 
  through 
  the 
  back 
  of 
  brain 
  of 
  the 
  adult 
  Locusta 
  Carolina, 
  passing 
  be- 
  

   hind 
  the 
  mushroom 
  body, 
  showing 
  the 
  oesophageal 
  commissures, 
  the 
  anten- 
  

   nal 
  lobes, 
  and 
  the 
  bundle 
  of 
  nerve-fibers 
  crossing 
  to 
  the 
  right 
  hemisphere. 
  

   The 
  left 
  calyx 
  is 
  cut 
  through, 
  the 
  microtome-razor 
  passing 
  behind 
  and 
  not 
  

   grazing 
  the 
  right 
  mushroom 
  body. 
  The 
  distribution 
  of 
  the 
  large 
  (7. 
  g. 
  c.) 
  

   and 
  small 
  ganglion 
  cells 
  (sm. 
  g. 
  c.) 
  is 
  well 
  seen 
  in 
  this 
  section. 
  It 
  will 
  be 
  

   seen 
  that 
  the 
  brain 
  of 
  Locusta 
  Carolina 
  does 
  not 
  differ 
  in 
  any 
  respect 
  from 
  

   that 
  of 
  Caloptenus 
  epretus, 
  so 
  far 
  as 
  the 
  sections 
  show. 
  

  

  