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TABLE XXIX. 



Systematic Survey of the Evolution of the Skin-covering and 

 Nerve System. 



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



Skin 



(Derma, 



or 



Integumentum) 



1 Horn-layer of the outer 

 6kin 

 (Stratum corneum) 

 Mucous layer of the 



sensory-layer 



outer skin 

 (Stratum mucosum) 



Leather-skin 



(Corium) 



Product of the Skin-" 



fibrous-layer 



r Fibrous layer of the 



leather skin 



(Cutis) 



Fatty layer of the leather' 



skin 



(Subcutis) 



Hair 

 Nails 



Sweat glands 

 Tear glands 

 Sebaceous glands 

 Milk glands 



^Connective tissue 

 Fatty tissue 

 Muscular tissue 

 Blood-vessels 

 Papillae of taste and 



nerves of the 



leather skin 



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



Central Marrow, 



or 



Central Nerve 



System 



(Psyche, or Medulla 

 Centralis). 



Product of the 



Skin-sensory 



layer 



/ /Great hemispheres 



I Olfactory lobules 

 I. Fore-brain J Lateral chambers 



(Protopsyche) 1 Streaked bodies 

 Arch 

 V Cross piece 



r Centre of sight 



tt m « * v • I Third chamber of i 



II. Twixt-brain J bra1n 



(Deutopsyche) ^ pineal body 

 I. Funnel 



_. „,., . . ("Four bulbs 



III. Mid-brain J Aqueduct f Sylvius 



(Mesopsyche) 1 Br l in 8talks 



IV. Hind-brain 



(Metapsyche) 



V. After-brain 

 (Epipsyche) 



(.Brain stalks 



r Small hemispheres 

 -j Brain worm 

 ^ Brain bridge 



{Pyramids 

 Olives 

 Restiform bodies 

 Fourth chamber of the 

 brain 



VI. Dorsad Marrow Notopsyche 



Eemisphcerce cerebri 



Lobi olfactorii 



Ventriculi lateral** 



Corpora striata 



Fornix 



Corpus callosum 



Thalami optici 

 Ventriculus tertius 



Conarium 

 Infundibulwm, 



Corpus bigeminum 

 Aquceductus Sylvii 

 Pedunculi cerebri 



Eemisphcerce cerebelli 

 Vermis cerebelli 

 Pons Varolii 



Corpora pyramidalia 

 Corpora olivaria 

 Corpora restiformia 

 Ventriculus quartus 



Medulla spinalis 



Medullary 

 coverings 

 (Meninges) 



{Enveloping 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 mater 



(Products of the skin-fibrous layer) 



