Chapter XLII: Introduction: 739

GENERAL DEVELOPMENT 740

BRAIN--
Adult brain 759
Development of the brain 764
Comparison of the larval and adult brain of
_Lepidosteus_, together with some observations on
the systematic value of the characters of the
Ganoid brain 767

SENSE ORGANS--
Olfactory organ 771
Anatomy of the eye _ib._
Development of the eye 772

SUCTORIAL DISC 774

MUSCULAR SYSTEM 775

SKELETON--
Vertebral column and ribs of the adult 776
Development of the vertebral column and ribs. 778
Comparison of the vertebral column of _Lepidosteus_
with that of other forms 792
The ribs of Fishes 793
The skeleton of the ventral lobe of the tail fin, and
its bearing on the nature of the tail fin of the
various types of Pisces 801

EXCRETORY AND GENERATIVE ORGANS--
Anatomy of the excretory and generative organs of the
female 810
Anatomy of the excretory and generative organs of the
male 813
Development of the excretory and generative organs 815
Theoretical considerations 822

THE ALIMENTARY CANAL AND ITS APPENDAGES--
Topographical anatomy of the alimentary canal 828
Development of the alimentary canal and its appendages 831

THE GILL ON THE HYOID ARCH 835

THE SYSTEMATIC POSITION OF LEPIDOSTEUS 836

LIST OF MEMOIRS ON THE ANATOMY AND DEVELOPMENT OF
LEPIDOSTEUS 840

LIST OF REFERENCE LETTERS 841

EXPLANATION OF PLATES 842