﻿FOSSILS 
  FROM 
  MADAGASCAR. 
  337 
  

  

  Dimensions. 
  — 
  Length 
  = 
  47 
  millim. 
  ; 
  height 
  =47 
  ; 
  breadth 
  (for 
  both 
  

   valves) 
  = 
  42 
  millim. 
  

  

  Observations. 
  — 
  The 
  specimen 
  under 
  description 
  consists 
  of 
  a 
  right 
  

   valve, 
  the 
  dentition 
  of 
  which 
  agrees 
  so 
  closely 
  with 
  that 
  of 
  the 
  

   Sphcera 
  of 
  James 
  Sowerby 
  that 
  I 
  have 
  no 
  hesitation 
  in 
  placing 
  

   it 
  under 
  that 
  genus. 
  The 
  specific 
  distinctions 
  are, 
  however, 
  

   sufficiently 
  marked 
  to 
  separate 
  it 
  from 
  the 
  type 
  form 
  of 
  Splicera 
  

   corruc/ata, 
  found 
  in 
  the 
  Neocomian 
  beds 
  of 
  Sandown 
  Bay, 
  which 
  has 
  

   an 
  almost 
  straight 
  hinge-line, 
  with 
  a 
  massive 
  flat 
  expansion 
  at 
  each 
  

   extremity, 
  giving 
  it 
  a 
  very 
  quadrate 
  appearance 
  ; 
  it 
  also 
  possesses 
  a 
  

   deep 
  pit 
  situated 
  beneath 
  the 
  posterior 
  expansion 
  of 
  the 
  hinge-area. 
  

   The 
  external 
  surface 
  has, 
  in 
  addition 
  to 
  the 
  concentric 
  furrows, 
  

   close 
  and 
  transverse 
  striae 
  producing 
  a 
  fimbriated 
  character, 
  which 
  

   is 
  not 
  observable 
  in 
  the 
  Malagasy 
  specimen. 
  

  

  This 
  new 
  shell 
  also 
  differs 
  considerably 
  from 
  the 
  other 
  species 
  of 
  

   Splicera 
  known 
  to 
  occur 
  in 
  the 
  British 
  and 
  Foreign 
  Oolites, 
  chiefly 
  

   on 
  account 
  of 
  its 
  large 
  size 
  and 
  arched 
  hinge-line. 
  

  

  Lower 
  Oolite, 
  South-west 
  Madagascar. 
  Collected 
  by 
  the 
  Eev. 
  J. 
  

   Richardson. 
  

  

  Brachiopoda. 
  

  

  1. 
  Terebratula 
  maxillata, 
  J. 
  de 
  C. 
  Sowerby, 
  1823. 
  

  

  Lower 
  Oolite 
  (England 
  ; 
  France). 
  S.W. 
  Madagascar. 
  Collected 
  

   by 
  the 
  Eev. 
  J. 
  Richardson. 
  

  

  2. 
  Waldheimia 
  perforata, 
  Piette, 
  1856. 
  

  

  Lias 
  (England 
  ; 
  France 
  ; 
  Germany). 
  West 
  of 
  Ankaramy. 
  

  

  3. 
  Rhtnchonella 
  (allied 
  to) 
  variabilis, 
  Schlotheim 
  (sp.), 
  1813. 
  

  

  Lower 
  Oolite 
  (Britain 
  ; 
  France 
  ; 
  Germany 
  ; 
  Russia). 
  Near 
  

   Ankoala. 
  

  

  4. 
  Rhtnchonella 
  (allied 
  to) 
  plicatella, 
  J. 
  de 
  C. 
  Sowerby 
  (sp.), 
  

  

  1825. 
  

  

  Lower 
  Oolite 
  (Britain 
  • 
  France). 
  Wear 
  Ankoala. 
  

  

  5. 
  Rhtnchonella 
  (allied 
  to) 
  tetraedra, 
  J. 
  Sowerby 
  (sp.), 
  1815. 
  

   Lias 
  (Britain 
  ; 
  France 
  ; 
  Germany). 
  West 
  of 
  Ankaramy. 
  

  

  6. 
  Rhy^chokella 
  obsoleta, 
  J. 
  Sowerby 
  (sp.), 
  1815. 
  

  

  Lower 
  Oolite 
  (France; 
  Germany). 
  South-west 
  Madagascar. 
  

   Collected 
  by 
  the 
  Rev. 
  J. 
  Richardson. 
  

  

  EOHINODERMATA. 
  

  

  1. 
  Pektacrinus 
  (fragment 
  of 
  stem). 
  

   Lias 
  ? 
  North 
  of 
  Andranosamonta. 
  

  

  2. 
  Acrosalenia 
  (fragments 
  of 
  test). 
  

  

  Lias 
  ? 
  North 
  of 
  Andranosamonta. 
  

  

  2b2 
  

  

  