F'G. l^,.— Structure of small specimen of Eozoon, calcareous matter 



removed. 



_ t, Natural size, 2. Acervuline cells of upper part. 3. Group of the same coalesc- 

 ing into a lamina with tuberculated surface. 4. Laminaj with tuberculated surfaces 

 in section, (bee also tig. 36.) 



166 



