﻿the 
  Gulf 
  of 
  Manaar. 
  93 
  

  

  Auletta 
  sycinularia, 
  but 
  he 
  gives 
  no 
  diagnosis. 
  Vosmaer 
  

   places 
  the 
  genus 
  near 
  Chalina 
  and 
  describes 
  a 
  new 
  species 
  

   under 
  the 
  name 
  Auletta 
  elegans 
  *, 
  which 
  certainly 
  seems 
  to 
  

   belong 
  to 
  the 
  genus. 
  In 
  his 
  work 
  on 
  the 
  Porifera 
  in 
  Bronn's 
  

   1 
  Klassen 
  und 
  Ordnungen 
  des 
  Thierreichs 
  ' 
  f 
  he 
  diagnoses 
  

   the 
  genus 
  as 
  follows 
  : 
  — 
  " 
  Einzelne 
  ' 
  Person,' 
  oder 
  Stock 
  von 
  

   rohrenformigen 
  ' 
  Personen.' 
  Skelet 
  besteht 
  aus 
  Biindeln 
  von 
  

   Spicula, 
  welche 
  vorziiglich 
  in 
  der 
  Langsrichtung 
  verlaufen. 
  

   Spic. 
  indie, 
  ac. 
  2 
  und 
  tr. 
  ac. 
  Canal-System 
  unbekannt." 
  

  

  The 
  genus 
  appears 
  to 
  be 
  truly 
  Axinellid 
  J, 
  and 
  may 
  be 
  

   briefly 
  diagnosed 
  as 
  follows 
  : 
  — 
  " 
  Tubular 
  Axinellidae. 
  Skele- 
  

   ton 
  reticulate. 
  Megasclera 
  monactinal 
  and 
  (sometimes 
  at 
  

   any 
  rate) 
  also 
  diactinal." 
  

  

  Hitherto 
  the 
  genus 
  has 
  been 
  obtained 
  only 
  from 
  the 
  

   Atlantic 
  and 
  Arctic 
  Oceans, 
  so 
  that 
  its 
  range 
  is 
  very 
  greatly 
  

   extended 
  by 
  Mr. 
  Thurston's 
  investigations. 
  

  

  Acanthella 
  Carteri, 
  n. 
  sp. 
  (PI. 
  IV. 
  fig. 
  6.) 
  

  

  Sponge 
  erect, 
  but 
  not 
  stipitate, 
  lamellar. 
  Lamellae 
  thin,. 
  

   irregular, 
  proliferously 
  branching, 
  with 
  sinuous 
  margins. 
  

   Both 
  surfaces 
  of 
  the 
  lamellae 
  are 
  covered 
  with 
  short, 
  stout, 
  

   conical 
  spines 
  and 
  ridges, 
  especially 
  prominent 
  in 
  the 
  dry 
  

   condition. 
  The 
  largest 
  specimen 
  is 
  130 
  millim. 
  high 
  by 
  

   about 
  180 
  millim. 
  broad, 
  and 
  the 
  lamellaa 
  of 
  which 
  it 
  is 
  com- 
  

   posed 
  average 
  about 
  2'5 
  millim. 
  in 
  thickness 
  in 
  the 
  dry 
  state, 
  

   excluding 
  the 
  spines 
  and 
  ridges. 
  The 
  texture 
  in 
  the 
  dry 
  

   state 
  is 
  hard 
  and 
  fairly 
  tough, 
  in 
  spirit 
  it 
  is 
  softer 
  and 
  tougher. 
  

   The 
  colour 
  of 
  the 
  living 
  sponge 
  was 
  orange-red 
  ; 
  in 
  the 
  dry 
  

   state 
  it 
  is 
  dull 
  reddish 
  orange, 
  and 
  in 
  spirit 
  greyish 
  yellow. 
  

  

  The 
  skeleton 
  is 
  a 
  very 
  irregular 
  network 
  of 
  stylote 
  spicules, 
  

   extremely 
  dense 
  in 
  certain 
  parts 
  of 
  the 
  sponge, 
  but 
  absent 
  or 
  

   almost 
  absent 
  in 
  others. 
  There 
  are 
  no 
  definite 
  fibres 
  and 
  

   these 
  are 
  probably 
  represented 
  by 
  certain 
  denser 
  spicular 
  

   tracts, 
  in 
  which 
  occasionally 
  traces 
  of 
  the 
  typical 
  Axinellid 
  

   arrangement 
  of 
  the 
  spicules 
  may 
  be 
  observed. 
  

  

  Spicules. 
  — 
  Styli 
  of 
  two 
  chief 
  forms 
  : 
  — 
  (a) 
  Short, 
  stout, 
  

   more 
  or 
  less 
  bent, 
  gradually 
  sharp-pointed 
  at 
  the 
  apex, 
  and 
  

   evenly 
  rounded 
  off 
  at 
  the 
  base 
  (tig. 
  6, 
  b, 
  c) 
  ; 
  size 
  about 
  - 
  4 
  

   by 
  0*021 
  millim. 
  (b) 
  A 
  comparatively 
  small 
  number 
  of 
  very 
  

   long 
  and 
  very 
  slender 
  slightly 
  curved 
  styli 
  (fig. 
  6, 
  e), 
  evenly 
  

  

  * 
  Report 
  on 
  Sponges 
  dredged 
  up 
  in 
  the 
  Arctic 
  Sea 
  by 
  the 
  ' 
  Willem 
  

   Barents 
  in 
  the 
  years 
  1678 
  and. 
  1&7U. 
  p. 
  40. 
  

  

  t 
  P. 
  341. 
  

  

  X 
  Cf. 
  Ridley 
  and 
  Dendy, 
  Report 
  on 
  the 
  ' 
  Challenger 
  * 
  Monaxonida, 
  

   p. 
  187". 
  

  

  