﻿682 
  JiXPLANATION 
  OF 
  THE 
  PLATES. 
  

  

  Fig. 
  G. 
  Reniern 
  cribriformis. 
  The 
  most 
  complete 
  of 
  the 
  fragments, 
  

   representing 
  the 
  type 
  specimen, 
  from 
  the 
  exterior. 
  In 
  

   spirit. 
  From 
  Seychelle 
  Islands, 
  12 
  fms. 
  x 
  |. 
  

  

  H 
  & 
  H'. 
  B. 
  camerata. 
  Two 
  fragments, 
  probably 
  belonging 
  

   to 
  one 
  (the 
  typical) 
  specimen. 
  H 
  shows 
  the 
  compact, 
  

   even 
  character 
  which 
  distinguishes 
  the 
  outer 
  surface 
  ; 
  

   H' 
  the 
  chambered 
  or 
  plicate 
  condition 
  of 
  the 
  interior. 
  

   In 
  spirit. 
  From 
  Marie 
  Louise 
  Island, 
  16-17 
  fms. 
  Nat. 
  

   size. 
  

  

  I. 
  ClatJiria 
  ma'andrina. 
  Part 
  of 
  the 
  type 
  specimen, 
  incrusting 
  

   a 
  stem. 
  In 
  spirit. 
  From 
  Marie 
  Louise 
  Island, 
  Amirantes, 
  

   17 
  fms. 
  Nat. 
  size. 
  

  

  J. 
  C. 
  frond 
  if 
  era. 
  The 
  largest 
  specimen 
  obtained 
  ; 
  attached 
  to 
  

   rock. 
  ' 
  It 
  shows 
  a 
  transition 
  from 
  a 
  flattened 
  expanded 
  

   (j) 
  to 
  a 
  rounded 
  trabecular 
  (f) 
  form 
  of 
  the 
  constituent 
  

   lobes 
  of 
  sponge-substance, 
  and 
  exhibits 
  more 
  definiteness 
  

   of 
  form 
  as 
  a 
  whole 
  than 
  is 
  usual 
  in 
  the 
  species. 
  Dry. 
  

   From 
  Providence 
  Ileef, 
  24 
  fms. 
  Nat. 
  size. 
  

  

  K. 
  C. 
  decumbens. 
  The 
  type 
  specimen, 
  showing 
  considerable 
  

   variation 
  in 
  the 
  proportionate 
  amount 
  of 
  fenestration 
  to 
  

   the 
  surface 
  (e. 
  g. 
  at 
  h 
  the 
  surface 
  is 
  entire, 
  at 
  Ic' 
  it 
  is 
  regu- 
  

   larly 
  fenestrate) 
  ; 
  at 
  h" 
  the 
  surface 
  is 
  abraded. 
  In 
  spirit. 
  

   From 
  Etoile 
  Island, 
  13 
  fms. 
  Nat. 
  size. 
  

  

  L. 
  Leucortis 
  anguinea. 
  The 
  type 
  specimen, 
  in 
  spirit. 
  From 
  

   Providence 
  Eeef, 
  24 
  fms. 
  x 
  2. 
  Z, 
  stem. 
  

  

  M. 
  Erylus 
  cylindrigerus. 
  The 
  type 
  specimen, 
  in 
  spirit. 
  From 
  

   Providence 
  Eeef. 
  Nat. 
  size. 
  

  

  N*. 
  Pliyllospongia 
  onadagascarcnsis, 
  var. 
  supraoculata. 
  From 
  

   African 
  Island. 
  Dry. 
  N'. 
  The 
  same, 
  upper 
  margin 
  of 
  

   median 
  lobe, 
  from 
  above, 
  to 
  show 
  thickness 
  of 
  frond 
  and 
  

   characters 
  of 
  vents. 
  Nat. 
  size. 
  

  

  * 
  By 
  an 
  inadvertence 
  these 
  figures 
  h".. 
  3 
  been 
  referred 
  to 
  in 
  tlie 
  text 
  (p. 
  504) 
  

   as 
  M 
  and 
  M' 
  

  

  