( 2 l 2 ) 



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) 



Outer-skin 

 (Epidermis) 

 Product of the Skin- 

 sensory-layer 



Horn-layer of the outer / Hair 

 skin Nails 



(Stratum corneum) | Sweat glands 



Mucous layer of the \ Tear glands 

 outer skin 

 (Stratum mucosum) 



Sebaceous glands 

 vMilk glands 



Leather-skin 

 (Corium) 



f Fibrous layer of 

 leather skin 



the 



I Connective tissue 

 Fatty tissue 

 Muscular tissue 



J r , , ( Cutl /?u ! .t, 4 Blood-vessels 

 Froduct of the Skin- ) Fatty layer of the leather } t>..„ :11 f tr 



fibrous-layer 





skin 



(Subcutis) 



Papillas 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 



Fore-brain 

 (Protopsyclie) 



II. Twixt-brain 



(Deut'opsyche) 



III. Mid-brain 



(Mesopsyche) 



IV. Hind-brain 



(Metapsyche) 



'Great hemispheres 

 Olfactory lobules 

 Lateral chambers 

 Streaked bodies 

 Arch 



I. Cross piece 



f Centre of sight 

 | Third chamber of the 

 •< brain 

 | Pineal body 

 L Funnel 



I 



Four bulbs 

 Aqueduct of Sylvius 

 (_ Brain stalks 



After-brain 

 (Epipsyche) 



( Small hemispheres 

 -j Brain worm 

 L Brain bridge 



( Pvramids 

 | Olives 



■{ Eestiform bodies 

 j Fourth chamber of the 

 (^ brain 



\VI. Dorsal Marrow Xotopsyche 



Eem ifph aerce cerebri 



J.obi olfactorii 



Ycntriculi lateralcs 



Cor i or a striata 



Fornix 



Corpus callosum 



Thalami optici 

 Yentriculus tertius 



Con avium 

 Infundibulum 



Corpus bigeminum 

 Aqueeductus Sylvii 

 Ptdunculi cerebri 



JTemisphara' cerebelli 

 Vermis cerebelli 

 Pons Varolii 



Corpora pyramidalia 

 Corpora oliraria 

 Corpora restiformia 

 Yentriculus 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 medullary 'skin Dura matev 



(Products of the skin-fibrous layer) 



