﻿76 
  A 
  MONOGRAPH 
  OF 
  THE 
  VICTORIAN 
  SPONGES. 
  

  

  ap. 
  r. 
  Apical 
  ray 
  of 
  qnadriradiate 
  spicule, 
  projecting 
  into 
  the 
  

   gastral 
  cavity. 
  

  

  ect. 
  

  

  Ectoderm. 
  

  

  end. 
  

  

  Endoderm. 
  

  

  i.e. 
  

  

  Inhalant 
  canal. 
  

  

  vies. 
  

  

  Mesoderm. 
  

  

  pr. 
  

  

  Prosopyle. 
  

  

  St. 
  c. 
  stellate 
  cell 
  of 
  mesoderm. 
  

  

  Figm-e 
  2. 
  — 
  Lencosolenia 
  stolonifer. 
  The 
  projecting 
  apical 
  ray 
  of 
  a 
  qnadriradiate 
  

   spicule, 
  enclosed 
  in 
  its 
  cellular 
  sheath. 
  (Zeiss 
  F, 
  Oc. 
  2.) 
  

  

  ap. 
  r. 
  Apical 
  ray. 
  

  

  c.c. 
  Collared 
  cells 
  around 
  the 
  base 
  of 
  the 
  spicule 
  ray. 
  

  

  sp. 
  s. 
  Sheath 
  of 
  flattened 
  endothelial 
  cells 
  around 
  the 
  spicule 
  ray. 
  

  

  Figure 
  3. 
  — 
  Lencosolenia 
  stolonifer. 
  A 
  multipolar 
  connective 
  tissue 
  cell 
  of 
  the 
  

   mesoderm 
  (Zeiss. 
  F, 
  Oc. 
  2). 
  

  

  Figure 
  4. 
  — 
  Lencosolenia 
  cavata. 
  Vertical 
  section 
  of 
  tube-wall 
  (Zeiss 
  F, 
  Oc. 
  2). 
  

   c.c. 
  Collared 
  cells. 
  

   ect. 
  Nucleus 
  of 
  ectoderm 
  cell. 
  

   mes. 
  Mesodermal 
  ground 
  -substance. 
  

   ov. 
  Ovum, 
  surrounded 
  by 
  other 
  mesodermal 
  cells. 
  

   sp. 
  Spicule. 
  

  

  st. 
  c. 
  Stellate 
  cell 
  of 
  mesoderm. 
  

   y. 
  gr. 
  Group 
  of 
  yellow 
  granules. 
  

  

  Figure 
  5. 
  —Lencosolenia 
  cavata. 
  Portion 
  of 
  tube-wall 
  laid 
  out 
  flat 
  and 
  examined 
  

   as 
  a 
  transparent 
  object; 
  the 
  entire 
  thickness 
  is 
  supposed 
  to 
  be 
  in 
  focus. 
  (Zeiss 
  F, 
  

   Oc. 
  2.) 
  

  

  y. 
  gy. 
  1. 
  Young 
  (solid) 
  group 
  of 
  yellow 
  granules. 
  

  

  y. 
  gy. 
  2. 
  Fully 
  developed 
  group 
  of 
  yellow 
  granules 
  with 
  central 
  

   space. 
  

  

  Other 
  lettering 
  as 
  in 
  Figure 
  4. 
  

  

  