C 232 



TABLE XXIX. 



Systematic Survey of the Evolution of the Skin-covering and 

 Nerve System. 



XXIX. A. Survey of the Evolution of tke Skin-covering. 



Skin 



(D rma, 



or 

 Integvinentum) 



1 Horn-layer of the outer / Hair 

 skin Nails 



(Stratum cornmrn) | Sweat glands 

 Mucous layer of the 1 Tear glands 

 outer skin Sebaceous glands 



(Stratum mueosum) ( Milk glands 



Leather-skin 





pillae of taste and 

 nerves of the 

 Uather skin 



XXIX. B. Survey of the Evolution of the Central Marrow. 



i VI. Dorsal Marrow Xotofsyche 



Medulla spinalit 



Medullary 

 coverings 



Inveloping mem- 

 branes, with the 

 nutritive blood- 

 vessels of the brain 

 and spinal cord 



1 . Soft medullary skin Pia mater 



2. Central medullary skin Arachnoidea 



3. Hard medull iry skin Dura matfr 



(Products of the skin-fibrous layer) 



