﻿from 
  the 
  Bay 
  of 
  Bengal. 
  

  

  295 
  

  

  Family 
  Astrorliizidse. 
  

   Sub 
  fa 
  m 
  i 
  1)' 
  A 
  stroehizixje. 
  

  

  Masoxella, 
  nov. 
  gen. 
  

  

  Test 
  free, 
  thin, 
  outspread, 
  discoidal 
  or 
  patelloid 
  ; 
  consisting 
  

   typically 
  of 
  a 
  central 
  chamber 
  with 
  radiating 
  tubes, 
  simple 
  or 
  

   branched, 
  open 
  at 
  the 
  periphery 
  ; 
  the 
  interstitial 
  spaces 
  occu- 
  

   pied 
  by 
  plates 
  of 
  agglutinated 
  sand-grains 
  ; 
  texture 
  arena- 
  

   ceous, 
  with 
  but 
  little 
  inorganic 
  cement. 
  

  

  Fur. 
  1. 
  

  

  Fi<y. 
  2. 
  

  

  Fig. 
  1. 
  — 
  MasoneUa 
  planulata, 
  n. 
  sp. 
  Fig-. 
  %—Masone.Ua 
  patelUformis, 
  

  

  n. 
  sp. 
  Magnified 
  5 
  diameter-. 
  

  

  MasoneUa 
  planulata, 
  n. 
  sp. 
  (Fig. 
  1.) 
  

  

  Test 
  thin, 
  complanate, 
  rounded 
  or 
  oval 
  in 
  outline; 
  pre- 
  

   senting 
  (typically) 
  a 
  small 
  central 
  convexity 
  about 
  one 
  third 
  

   the 
  diameter 
  of 
  the 
  disk, 
  nearly 
  equally 
  developed 
  on 
  the 
  

   two 
  lateral 
  faces. 
  Radial 
  tubes 
  numerous, 
  from 
  Ol 
  to 
  0*2 
  

   millim. 
  in 
  diameter 
  ; 
  either 
  simple 
  or 
  dividing 
  into 
  two 
  or 
  

   three 
  branches 
  ; 
  limbate 
  externally 
  ; 
  the 
  open 
  peripheral 
  

   extremities 
  serving 
  as 
  the 
  general 
  aperture. 
  Texture 
  loosely 
  

  

  21* 
  

  

  