﻿ALCrONAEIA. 
  355 
  

  

  and 
  measure 
  "4 
  to 
  '6 
  bj'' 
  '035 
  to 
  '06 
  millim. 
  [Comparing 
  Studer's 
  

   species 
  S. 
  gratji 
  with 
  this 
  species, 
  it 
  appears 
  to 
  correspond 
  closely 
  

   with 
  it, 
  but 
  is 
  perhaps 
  distinct 
  by 
  virtue 
  of 
  the 
  smaller 
  size 
  of 
  the 
  

   spicules 
  and 
  the 
  simple 
  character 
  of 
  their 
  tubercles, 
  as 
  stated 
  above.] 
  

  

  Eah. 
  Port 
  Molle, 
  Queensland, 
  12-20 
  fms., 
  bottom 
  rocks 
  and 
  

   coral 
  ; 
  Arafura 
  Sea, 
  off 
  N.W. 
  coast 
  of 
  Australia, 
  32-36 
  fms., 
  bottom 
  

   sand, 
  mud, 
  and 
  shells. 
  Also 
  Mei'maid 
  Strait, 
  N.W.Australia 
  (Stiider). 
  

  

  Ohs. 
  It 
  is 
  interesting 
  to 
  note 
  that 
  it 
  is 
  the 
  specimen 
  which 
  comes 
  

   from 
  a 
  roclcy 
  bottom 
  which 
  has 
  the 
  simple, 
  moderately 
  long, 
  cylin- 
  

   drical 
  stem 
  resembling 
  that 
  of 
  the 
  type 
  specimen, 
  while 
  that 
  which 
  

   came 
  from 
  a 
  loose 
  bottom 
  (sand 
  &c.) 
  has 
  a 
  long 
  spatulate 
  termina- 
  

   tion, 
  well 
  adapted 
  for 
  maintaining 
  the 
  colony 
  in 
  an 
  upright 
  position 
  

   in 
  this 
  less 
  stable 
  material. 
  

  

  It 
  seems 
  extremely 
  probable 
  from 
  the 
  account 
  given 
  by 
  Messrs. 
  

   Milne-Edwards 
  and 
  Haime 
  (?. 
  c.) 
  of 
  the 
  external 
  characters 
  of 
  their 
  

   Coiloriorri'ia 
  pahnosa 
  ,\h.?ii 
  it 
  is 
  generically 
  identical 
  with 
  /So^enocrtM^wjii; 
  

   but 
  hnding 
  a 
  very 
  different 
  spiculation 
  indicated 
  in 
  a 
  Paris 
  slide 
  

   in 
  this 
  Museum, 
  which 
  professes 
  to 
  belong 
  to 
  the 
  species, 
  I 
  prefer 
  

   to 
  follow 
  Studcr 
  in 
  leaving 
  the 
  question 
  for 
  future 
  investigation. 
  

  

  31. 
  Leucoella 
  cervicornis. 
  

  

  Leucoella 
  cervicornis, 
  Gray, 
  A7in. 
  8) 
  Mag. 
  N. 
  H, 
  (4) 
  v, 
  p. 
  408. 
  

  

  A 
  Briareacean 
  intermediate 
  in 
  its 
  characters 
  between 
  Suheria, 
  

   Studer 
  (ME. 
  Ak. 
  Berlin, 
  1878, 
  p. 
  666), 
  and 
  Solenocaulum, 
  Gray. 
  

   Its 
  most 
  striking 
  external 
  feature 
  is 
  the 
  broad 
  posterior 
  space 
  devoid 
  

   of 
  polypes 
  and 
  (in 
  the 
  dry 
  state, 
  at 
  any 
  rate) 
  indented 
  by 
  a 
  wide 
  

   groove. 
  In 
  the 
  type 
  specimens 
  in 
  the 
  British 
  Museum 
  the 
  verrucse 
  

   mostly 
  have 
  rounded 
  blunt 
  terminations, 
  about 
  1 
  millim. 
  in 
  maxi- 
  

   mum 
  height 
  ; 
  in 
  a 
  specimen, 
  however, 
  contained 
  in 
  the 
  present 
  

   collection 
  they 
  are 
  mostly 
  pointed 
  and 
  very 
  prominent, 
  viz, 
  2 
  millim. 
  

   high 
  in 
  some 
  cases. 
  Whereas 
  also 
  in 
  the 
  type 
  specimen 
  the 
  colour 
  

   is 
  somewhat 
  pale 
  umber-brown, 
  in 
  the 
  present 
  specimen 
  the 
  colour 
  is 
  

   very 
  dark 
  umber-brown, 
  becoming 
  almost 
  black 
  at 
  the 
  tips 
  of 
  the 
  ver- 
  

   rucfe 
  ; 
  in 
  this 
  specimen 
  the 
  anterior 
  aspects 
  of 
  the 
  tips 
  of 
  the 
  branches 
  

   are 
  almost 
  devoid 
  of 
  verruca} 
  and 
  usually 
  much 
  flattened, 
  while 
  the 
  

   verrucas 
  on 
  the 
  anterior 
  and 
  lateral 
  faces 
  of 
  the 
  other 
  parts 
  are 
  placed 
  

   at 
  distinct 
  intervals; 
  the 
  latter 
  are 
  closely 
  set 
  in 
  about 
  equal 
  pro- 
  

   portions 
  over 
  all 
  parts 
  of 
  the 
  anterior 
  and 
  lateral 
  surfaces 
  of 
  the 
  

   stem 
  and 
  branches. 
  The 
  axial 
  spicules 
  (i.) 
  in 
  both 
  specimens 
  are 
  

   cylindrical, 
  pointed 
  at 
  the 
  ends, 
  and 
  covered 
  with 
  small 
  sharp 
  

   tubercles 
  ; 
  size 
  -35 
  to 
  "42 
  by 
  '024 
  to 
  "027 
  millim. 
  The 
  cortical 
  spicules 
  

   are 
  either 
  (ii.) 
  fine, 
  long, 
  fusiform, 
  tapering 
  to 
  points 
  at 
  both 
  ends, 
  

   provided 
  with 
  numerous, 
  but 
  distinct 
  prominent 
  tubercles, 
  "28 
  to 
  -42 
  

   millim. 
  by 
  "053 
  to 
  '08 
  millim., 
  or 
  (iii.) 
  squat 
  fusiform, 
  with 
  the 
  ends 
  

   more 
  rounded 
  than 
  in 
  (ii.), 
  with 
  the 
  tubercles 
  stouter 
  and 
  blunter 
  

   but 
  crowded 
  together 
  ; 
  size 
  '14 
  to 
  -28 
  by 
  -053 
  to 
  -07 
  millim. 
  This 
  

   specimen 
  furnishes 
  us 
  with 
  a 
  locality 
  for 
  the 
  species, 
  that 
  of 
  the 
  

   original 
  specimen 
  not 
  being 
  known. 
  

  

  Hah. 
  Port 
  Denison, 
  Queensland, 
  4 
  fms. 
  ; 
  bottom 
  rock. 
  

  

  2a2 
  

  

  