vi CONTENTS. 



HISTOLOGICAL. PAGE 



Method 40 



Anatomy 41 



Distal Complex Eye- 

 General 41 



Cornea 42 



The Lens 42 



The Capsule 44 



The Retina 45 



(a) The Prism Cells 46 



(b) The Pyramid Cells 48 



(c) The Long Pigment Cells 50 



(d) Subretinal Nerve Tissue 53 



(e) Discussion of Literature 53 



(f) Function of the Retinal Cells, Patten's Theory, and further 



Literature 56 



The Proximal Complex Eye 60 



The Simple Eyes 61 



Lithocyst and Concretion 63 



The Epithelium of the Clubs 64 



Network and Multipolar Ganglion Cells 67 



The Nerve Tissue 67 



The Supporting Lamella 68 



Epithelium of Ampulla and Floating Cells 68 



The Endothelium of the Peduncle ' 73 



The Tentacles and Pedalia 



The Ectoderm 74 



(a) Thread Cells 74 



(b) Muscle Fibers 74 



(c) Ganglion Cell 75 



The Endoderm 75 



SUMMARY 77 



LITERATURE 78 



REFERENCE LETTERS 80 



DESCRIPTION OF FIGURES . 81 



