Xll 



CONTENTS. 



Structure of Ovum 



Zona Pellucida ..... 



Food or Secondary Yolk . 



Principal or Formative Yolk 



Vesicula Germinativa . 



Macula Germinativa . 



Cicatricula '. 



Ova of Birds 



Ova of Selachia . 



Ova of Batrachia . 

 Ovaries and Ova of Invertebrata . 



,, Protozoa . . . . . 



,, Porifera ...... 



,, Infusoria 



,, Ehizopoda >.,... 



,, Coalenterata . 



,, Echinodermata ... 



,, Vermes . . . 



,, Mollusca 



,, Arthropoda . ' . 



,, Crustacea .. 



,, Arachnida 



Development of the Ovaries and Ova 

 Formation of Corpus Luteum . 

 Parovarium . . 



CHAPTER XXVI. 



SKIN, HAIR, AND NAILS. 

 BY ALFRED BIESIADECKI, 



PEOFESSOB IN CRACOW. 



General Anatomy of the Skin . 



Subcutaneous Connective Tissue . 



Corium 



Bloodvessels of . 

 Lymphatics of the Skin ...... 



Epidermis ........ 



Mucous Layer of 



Horny Layer of 



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