﻿630 
  COLLECTIONS 
  FROM 
  THE 
  WESTERN 
  INDIAN 
  OCEAN. 
  

  

  the 
  presence 
  in 
  the 
  peristome 
  of 
  fine 
  aceratcs 
  ; 
  the 
  triradiates 
  have 
  

   their 
  arms 
  straighter 
  than 
  those 
  figured 
  by 
  Hackel 
  for 
  his 
  species, 
  

   but 
  their 
  forms 
  and 
  dimensions 
  are 
  about 
  the 
  same 
  in 
  the 
  two 
  

   species. 
  

  

  56. 
  Leuconia 
  echinata. 
  

  

  Leucandra 
  echinata, 
  Schuffner, 
  JenaiscJi. 
  Zeitschr. 
  xi. 
  p. 
  411, 
  pi, 
  xxiv. 
  

   fig. 
  4. 
  

  

  A 
  compressed 
  purse-shaped 
  specimen, 
  with 
  the 
  mouth-opening 
  

   lost. 
  The 
  outer 
  termination 
  of 
  the 
  acerate 
  is 
  slightly 
  enlarged 
  just 
  

   before 
  the 
  point, 
  forming 
  a 
  hastate 
  apex, 
  not 
  noticed 
  by 
  Schuffner, 
  

   who 
  only 
  says 
  that 
  the 
  spicule 
  is 
  "unequally 
  pointed 
  at 
  the 
  two 
  ends." 
  

   The 
  specimen 
  measures 
  20 
  millim. 
  in 
  greatest 
  diameter, 
  whereas 
  

   Sehuffner's 
  did 
  not 
  exceed 
  10 
  millim. 
  

  

  Hah. 
  Darros 
  Island, 
  Amirante 
  group, 
  22 
  fms. 
  

  

  Distribution. 
  Mauritius 
  {Schuffner). 
  

  

  