﻿81 
  

  

  Beitrag 
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  den 
  embrjonalen 
  Blatter 
  bei 
  den 
  

   Mollusken. 
  von 
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  in 
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   -Jahresberichte, 
  1, 
  1872. 
  

  

  Ueber 
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  und 
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   Keimblatter 
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  von 
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  von 
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   ing, 
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  XXVIl, 
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  The 
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   Pulmonates. 
  By 
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  Brooks. 
  Studies 
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   cal 
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  1879, 
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   press). 
  

  

  Bemerknngen 
  liber 
  Haeckel's 
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  von 
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   "W. 
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  Prof, 
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  On 
  the 
  Primitive 
  Cell-Layers 
  of' 
  the 
  Embryo 
  as 
  a 
  Basis 
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   Genealogical 
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  By 
  E. 
  Ray 
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   ter. 
  Ann. 
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  Hist, 
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  1873. 
  

  

  Notes 
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  Stu- 
  

   dents. 
  By 
  E. 
  Ray 
  Lankester. 
  London 
  : 
  ls77. 
  

  

  The 
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  By 
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  K. 
  

   Brooks, 
  Proc. 
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  Hist., 
  XVIII, 
  Feb. 
  2, 
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   p. 
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  Ueber 
  die 
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  der 
  Tellerschnecke. 
  von 
  Carl 
  

   Rabl. 
  Morphologisches 
  Jahrbuch, 
  Y, 
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  1879, 
  p. 
  562. 
  

  

  