﻿EXPLAN.VrrON 
  OF 
  THE 
  PLATES. 
  681 
  

  

  Fig. 
  C. 
  Frontal 
  region 
  of 
  Gonodacit/lus 
  (G 
  elegans, 
  cJ?), 
  showing 
  

   the 
  form 
  of 
  the 
  rostrum, 
  x 
  3. 
  

  

  I). 
  Part 
  of 
  right 
  gnathopod 
  of 
  Mtjem 
  diver 
  simmius. 
  d, 
  part 
  of 
  

   loft 
  gnathopod. 
  

  

  SPONGES. 
  

  

  Plate 
  LIII. 
  

  

  Fig. 
  A. 
  Leucoj)hl(eus 
  fenestratus. 
  Specimen 
  which 
  has 
  incorporated 
  

   many 
  calcareous 
  fragments 
  with 
  its 
  base, 
  and 
  gives 
  off 
  a 
  

   remarkable 
  smooth 
  flat 
  lohate 
  process 
  (a) 
  from 
  the 
  base. 
  

   In 
  spirit. 
  From 
  Providence 
  Eeef, 
  24 
  fms, 
  X 
  Ig. 
  

  

  B. 
  L. 
  proteus. 
  Variety 
  . 
  distinguished 
  by 
  its 
  almost 
  entirely 
  

  

  massive 
  and 
  smooth 
  habit, 
  a 
  small 
  part 
  only 
  (h) 
  of 
  the 
  

   surface 
  exhibiting 
  the 
  usual 
  ridged 
  and 
  pilose 
  character. 
  

   b', 
  apparently 
  accidental 
  pit. 
  In 
  spirit. 
  From 
  Providence 
  

   Reef, 
  24 
  fms. 
  Nat. 
  size. 
  

  

  C. 
  Dysidea 
  gumminea. 
  Small 
  specimen, 
  based 
  on 
  a 
  stone, 
  

  

  showing 
  lateral 
  extension 
  into 
  lobes. 
  In 
  spirit. 
  From 
  

   Providence 
  Island, 
  1*J 
  fms. 
  Nat. 
  size. 
  

  

  D. 
  Hippospongia 
  intestinalis, 
  var. 
  Part 
  of 
  a 
  largo 
  contorted 
  

  

  mass, 
  showing 
  great 
  irregularity 
  of 
  growth 
  and 
  variation 
  

   in 
  the 
  stoutness 
  of 
  the 
  twisted 
  lobes 
  [the 
  dermal 
  sheet 
  of 
  

   fibres 
  has 
  been 
  abraded 
  from 
  the 
  lobes 
  towards 
  the 
  top 
  of 
  

   the 
  figure 
  (d)]. 
  Dry. 
  From 
  Providence 
  Island. 
  Nat. 
  

   size. 
  

  

  Fi. 
  A.vinella 
  proliferans. 
  Left-hand 
  lialf 
  of 
  small 
  specimen 
  

   from 
  Providence 
  Island, 
  19 
  fms. 
  In 
  spirit, 
  x 
  f. 
  E'. 
  

   Profile 
  view 
  of 
  upper 
  part 
  of 
  same 
  specimen, 
  slightly 
  

   shaded. 
  Nat. 
  size. 
  

  

  F. 
  Desmacidon 
  rimosa. 
  The 
  type 
  specimen, 
  showing 
  the 
  large 
  

   vents 
  and 
  well-marked 
  grooves 
  (/,/') 
  of 
  the 
  excretory 
  

   canal-system. 
  In 
  si)irit. 
  From 
  Mozambique. 
  Nat. 
  

   size. 
  

  

  3 
  a 
  

  

  