﻿PLATE 
  XIII. 
  

  

  Fig. 
  1. 
  Section 
  through 
  the 
  brain 
  of 
  Caloptenus 
  oivittatus 
  in 
  the 
  third 
  larval 
  stage, 
  

   showing 
  the 
  two 
  hemispheres 
  or 
  sides 
  of 
  the 
  brain 
  and 
  the 
  ocelli 
  and 
  ocellar 
  

   nerves, 
  which 
  are 
  seen 
  to 
  arise 
  from 
  the 
  top 
  of 
  the 
  hemispheres 
  directly 
  over 
  

   the 
  calices 
  (compare 
  Plate 
  ix, 
  fig. 
  — 
  ) 
  ; 
  o. 
  cal., 
  outer 
  calyx 
  of 
  left 
  mushroom 
  

   body. 
  The 
  lighter 
  portions 
  represent 
  the 
  granulo-fibrous 
  central 
  part 
  of 
  the 
  

   brain, 
  and 
  the 
  dark 
  the 
  cortical 
  ganglionic 
  cells 
  ; 
  X 
  i 
  A. 
  

  

  Fig. 
  2. 
  The 
  right 
  hemisphere 
  of 
  fig. 
  1 
  magnified 
  225 
  diameters, 
  showing 
  the 
  mush- 
  

   room 
  body, 
  its 
  peduncle 
  (p.), 
  cauliculus 
  (caw.), 
  and 
  outer 
  (o. 
  cal.) 
  and 
  inner 
  

   (i. 
  cal.) 
  calices, 
  and 
  the 
  bundles 
  of 
  fibers 
  variously 
  distributed 
  to 
  the 
  optic 
  

   and 
  commissural 
  lobes. 
  

  

  Fig. 
  3. 
  Section 
  passing 
  immediately 
  in 
  front 
  of 
  that 
  represented 
  in 
  fig. 
  1, 
  and 
  show- 
  

   ing 
  the 
  calices 
  without 
  the 
  stalk, 
  and 
  the 
  oesophageal 
  commissural 
  lobe 
  and 
  

   its 
  commissure 
  (com.)', 
  the 
  two 
  hemispheres 
  are 
  united 
  below 
  ; 
  separate 
  in 
  

   fig.l. 
  

  

  Fig. 
  4. 
  Enlarged 
  view 
  ( 
  X 
  400 
  diameters) 
  of 
  the 
  central 
  body 
  and 
  contiguous 
  parts 
  

   from 
  section 
  11 
  of 
  the 
  older 
  embryo 
  of 
  C. 
  spretus, 
  represented 
  in 
  Plate 
  xii, 
  

   fig. 
  8, 
  cent. 
  o. 
  and 
  low. 
  I. 
  The 
  central 
  body 
  is 
  seen 
  to 
  be 
  separated 
  from 
  

   the 
  other 
  parts 
  by 
  a 
  partition 
  of 
  ganglion 
  cells. 
  Are 
  the 
  four 
  ganglion 
  cells 
  

   in 
  the 
  upper 
  part 
  the 
  rudimentary 
  cellular 
  bodies 
  % 
  Only 
  the 
  right 
  half 
  of 
  

   the 
  central 
  body 
  is 
  drawn. 
  The 
  right 
  half 
  of 
  the 
  upper 
  cerebral 
  lobe 
  is 
  rep- 
  

   resented 
  (up. 
  I.), 
  and 
  below 
  the 
  entire 
  trabecula, 
  as 
  it 
  appears 
  to 
  be. 
  

  

  Fig. 
  5. 
  Section 
  No. 
  8 
  of 
  the 
  first 
  thoracic 
  ganglion 
  of 
  the 
  youngest 
  embryo 
  (see, 
  also, 
  

   Plate 
  xii, 
  figs. 
  1, 
  la, 
  and 
  fig. 
  10). 
  The 
  hour-glass-shaped 
  ganglion 
  consists 
  of 
  

   inner 
  granular 
  nervous 
  matter 
  (gran.), 
  with 
  no 
  fibers 
  present, 
  and 
  of 
  a 
  layer 
  

   of 
  cortical 
  ganglionic 
  cells 
  (gang, 
  c), 
  the 
  layer 
  being 
  thickest 
  on 
  the 
  under 
  

   side 
  of 
  the 
  ganglion 
  and 
  wanting 
  at 
  and 
  near 
  the 
  middle 
  of 
  the 
  upper 
  side. 
  

   Magnified 
  225 
  diameters. 
  

  

  Fig. 
  6. 
  Section 
  No. 
  15 
  of 
  older 
  embryo, 
  represented 
  also 
  by 
  figs. 
  2-9 
  of 
  Plate 
  xii, 
  show- 
  

   ing 
  the 
  nervous 
  cord 
  (n. 
  c), 
  surrounded 
  by 
  connective-tissue 
  cells 
  ; 
  X 
  i 
  A. 
  

  

  Fig. 
  7. 
  Section 
  No. 
  16 
  through 
  the 
  same 
  embryo, 
  posterior 
  to 
  section 
  15, 
  the 
  cord 
  

   being 
  smaller 
  than 
  in 
  section 
  15. 
  These 
  sections 
  were 
  cut 
  just 
  in 
  front 
  of 
  

   the 
  stomach 
  and 
  cceca. 
  

  

  