﻿A 
  MONOGRAPH 
  OF 
  THE 
  YICTORIAN 
  SPONGES. 
  45 
  

  

  IV.— 
  DESCRIPTIONS 
  OF 
  THE 
  VICTORIAN 
  SPECIES 
  OF 
  CALCAREA 
  HOMOCCELA. 
  

  

  I 
  follow 
  Polejaeff* 
  in 
  dividing 
  the 
  calcareous 
  sponges 
  into 
  two 
  orders, 
  Homoccela 
  

   and 
  Heteroccela. 
  The 
  term 
  Homoccela, 
  as 
  already 
  stated, 
  is 
  synonvmons 
  with 
  Hfeclvel's 
  

   term 
  Ascones 
  and 
  the 
  diagnosis 
  of 
  the 
  order 
  is 
  the 
  same 
  as 
  that 
  of 
  the 
  sole 
  genus 
  

   {Leucosoleuia) 
  comprised 
  therein. 
  

  

  Genus 
  Leucosoleuia, 
  Bowerloanlv.f 
  

  

  Diagnosis. 
  — 
  Calcareous 
  sponges 
  in 
  which 
  the 
  endoderm 
  consists 
  throughout 
  of 
  

   collared 
  cells. 
  

  

  In 
  the 
  following 
  arrangement 
  of 
  the 
  Victorian 
  species 
  of 
  Leucosoleuia 
  I 
  include 
  

   only 
  such 
  as 
  I 
  have 
  been 
  able 
  to 
  examine 
  myself 
  or 
  such 
  as 
  are 
  sufficiently 
  fully 
  

   described 
  as 
  to 
  make 
  their 
  indentity 
  tolerably 
  certain. 
  I 
  give 
  at 
  the 
  end 
  a 
  list, 
  

   together 
  with 
  the 
  original 
  descriptions, 
  of 
  what 
  must 
  at 
  present 
  be 
  considered 
  as 
  

   doubtful 
  species 
  stated 
  to 
  have 
  been 
  found 
  in 
  Victorian 
  seas. 
  

  

  Section 
  1. 
  SimpUcia, 
  

  

  The 
  Ascon-persons 
  either 
  remain 
  solitary 
  and 
  do 
  not 
  form 
  colonies, 
  or 
  they 
  form 
  

   simple 
  colonies 
  in 
  which 
  the 
  component 
  Ascon-persons 
  may 
  branch 
  but 
  never 
  form 
  

   com})lex 
  anastomoses 
  nor 
  give 
  off 
  radial 
  tubes, 
  so 
  that 
  the 
  individuality 
  of 
  the 
  

   different 
  members 
  of 
  the 
  colony 
  is 
  easily 
  recognisable. 
  

  

  1. 
  Leucosoleuia 
  lucasi, 
  n.s\^. 
  

  

  (PL 
  I., 
  Fig. 
  1 
  ; 
  PI. 
  IV.; 
  Fig. 
  1 
  ; 
  PI. 
  IX., 
  Fig. 
  1.) 
  

  

  (a.) 
  General 
  Appearance 
  and 
  Canal 
  System. 
  — 
  The 
  spong(> 
  (PI. 
  I., 
  Fig. 
  1) 
  forms 
  

   loose 
  colonies, 
  the 
  Ascon-persons 
  l)eing 
  connected 
  at 
  their 
  bases 
  by 
  a 
  hollow 
  

   spongorhiza 
  which 
  creej)S 
  over 
  foreign 
  objects. 
  The 
  Ascon-persons 
  are 
  small, 
  

   cylindrical, 
  thin-walled 
  tiib(>s, 
  '2 
  or 
  )) 
  mm. 
  in 
  height 
  and 
  about 
  0-7 
  mm. 
  in 
  diameter. 
  

   When 
  fully 
  grown 
  there 
  is 
  a 
  wide 
  oscuhnn 
  at 
  the 
  summit 
  of 
  c^acli 
  iiidivithiah 
  Tlu> 
  

   outer 
  surface 
  of 
  the 
  tubes 
  is 
  very 
  minutely 
  hispid 
  and 
  the 
  colour 
  in 
  sjiirii 
  is 
  white. 
  

  

  • 
  lli'ijort 
  on 
  llic 
  (Jiilciircii 
  nt 
  the 
  " 
  CliallpnRor 
  " 
  Expedition, 
  p. 
  22. 
  

  

  t 
  I'lillosopliiciil 
  'I'ransactioiib 
  of 
  tlie 
  Uoyivl 
  Society 
  of 
  Iiouilon, 
  1802, 
  p. 
  109-1. 
  

  

  