﻿88 
  Mr. 
  A. 
  Dendy 
  on 
  Sponge* 
  from 
  

  

  a 
  few 
  small 
  styli 
  arranged 
  with 
  their 
  apices 
  projecting 
  at 
  the 
  

   surface 
  of 
  the 
  sponge. 
  

  

  Spicules. 
  — 
  (1) 
  Large, 
  curved, 
  gradually 
  sharp-pointed 
  

   oxea 
  (fig. 
  5, 
  b), 
  measuring 
  about 
  08 
  by 
  O021 
  millim. 
  

   (2) 
  Small, 
  slightly 
  curved, 
  smooth 
  styli 
  (fig. 
  5, 
  a), 
  evenly 
  

   rounded 
  off 
  at 
  the 
  base 
  and 
  gradually 
  sharp-pointed 
  at 
  the 
  

   apex 
  ; 
  commonlv 
  narrowing 
  somewhat 
  towards 
  the 
  base 
  ; 
  

   size 
  about 
  0*2 
  by 
  0'007 
  millim. 
  

  

  The 
  specific 
  name 
  foetida 
  has 
  been 
  given 
  to 
  this 
  sponge 
  on 
  

   account 
  of 
  the 
  abominable 
  smell, 
  resembling 
  somewhat 
  the 
  

   smell 
  of 
  Valerian, 
  given 
  out 
  by 
  the 
  dry 
  specimen. 
  

  

  The 
  presence 
  of 
  the 
  small 
  projecting 
  styli 
  in 
  the 
  dermal 
  

   skeleton 
  recalls 
  the 
  similar 
  condition 
  described 
  by 
  Ridley 
  and 
  

   Dendy 
  in 
  Hymeniacidon 
  (?) 
  subacerata 
  *. 
  

  

  Axinella 
  labyrinthica 
  % 
  n. 
  sp. 
  (PI. 
  V. 
  fig. 
  12.) 
  

  

  Sponge 
  forming 
  sessile, 
  low-growing, 
  erect, 
  branching 
  and 
  

   anastomosing 
  lamellae. 
  Surface 
  uniformly 
  covered 
  with 
  

   small, 
  close-set, 
  rather 
  slender 
  conuli, 
  each 
  about 
  2 
  millim. 
  in 
  

   height. 
  Colour 
  of 
  the 
  living 
  sponge 
  bright 
  orange 
  ; 
  when 
  

   dry 
  or 
  in 
  spirit 
  yellowish. 
  Texture 
  (dry 
  and 
  in 
  spirit) 
  rather 
  

   hard 
  and 
  fairly 
  tough. 
  Oscula 
  minute, 
  abundantly 
  scattered 
  

   between 
  the 
  conuli. 
  The 
  single 
  specimen 
  is 
  71 
  millim. 
  in 
  

   height 
  and 
  200 
  millim. 
  in 
  greatest 
  breadth 
  ; 
  the 
  thickness 
  of 
  

   the 
  lamellee 
  is 
  about 
  9 
  millim., 
  including 
  the 
  conuli. 
  

  

  The 
  skeleton 
  is 
  an 
  exceedingly 
  dense 
  irregular 
  network 
  of 
  

   spicules, 
  in 
  which 
  it 
  is 
  very 
  difficult 
  to 
  make 
  out 
  any 
  distinct 
  

   fibres 
  ; 
  but 
  stout 
  columns 
  of 
  closely 
  aggregated 
  spicules 
  may 
  

   be 
  seen 
  running 
  one 
  into 
  each 
  of 
  the 
  surface 
  conuli. 
  The 
  

   surface 
  of 
  the 
  conuli 
  is 
  densely 
  echinated 
  by 
  projecting 
  spi- 
  

   cules 
  springing 
  from 
  these 
  columns. 
  We 
  may 
  imagine 
  the 
  

   whole 
  skeleton 
  derived 
  from 
  a 
  typical 
  axinellid 
  form 
  by 
  

   excessive 
  development 
  of 
  the 
  spicules, 
  which 
  are 
  closely 
  

   united 
  together. 
  

  

  Spicules 
  : 
  — 
  (1) 
  Smooth 
  styli 
  (fig. 
  12, 
  b, 
  c), 
  usually 
  more 
  or 
  

   less 
  bent, 
  especially 
  towards 
  the 
  base, 
  and 
  gradually 
  sharp- 
  

   pointed 
  at 
  the 
  apex 
  ; 
  size 
  usually 
  about 
  0*42 
  by 
  0*016 
  

   millim. 
  (2) 
  Slender 
  curved 
  strongyla 
  (tig. 
  12, 
  a), 
  as 
  long 
  as 
  

   or 
  somewhat 
  longer 
  than 
  the 
  styli, 
  but 
  slenderer. 
  

  

  This 
  is 
  a 
  very 
  beautiful 
  species, 
  with 
  a 
  well-marked 
  and 
  

   characteristic 
  external 
  form. 
  

  

  * 
  Fide 
  Report 
  on 
  the 
  ' 
  Challenger' 
  Monaxonida, 
  p. 
  169. 
  

  

  