PHYSIOLOGICAL INDEX. 



Feet of Julus ..... 



Scolopendra . 



Legs of Insects ..... 



Mechanical structure of the feet of Insects 



Wings of Insects ..... 



Muscular system of Insects . . 



Spinning organs of Arachnidans 



Locomotive organs of Crustacea 



Muscles of Cirrhopoda .... 



Arms of Brachiopoda . 



Mantle of Ascidia ..... 



Foot of Conchifera . 



Byssus of Mussel and Pinna 



Apparatus for opening and closing the shells of Conchifera 



Muscular system of Snail .... 



Locomotive organs of Pteropoda 



Tentacula and suckers of Cuttle-fishes 



Sails (so called) of Argonaut . . 



Arms and float of Nautilus Pompilius . . 



Locomotive apparatus of Argonaut 



Fins and muscular system of Fishes 



Limbs of Reptiles . 



Muscular system of Reptiles 



Locomotion of Birds . . . 



Muscular system of Mammalia 



XI 



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SKELETONS OF INVERTEBRATA. 



Horny and calcareous framework of Sponges 

 Shells of Infusoria .... 



Polyparies of Polyps ...... 



Fungidae .... . 



Cortical Polyps ..... 



Tubiporidae ..... 



Sertularidae . ..... 



Internal plates of Velella and Porpita 



Cells of Bryozoa ...... 



Shells of Rotifera ..... 



Skeletons of Echinodermata. 



Crinoidae ...... 



Asteridae ...... 



Echinidae ...... 



Skeletons of Homogangliata ..... 



Myriapoda 



Insecta . 



Arachnida ..... 



Crustacea ...... 



Structure and growth of the shells of Mollusca : 



Cirrhopoda . 



Brachiopoda ..... 



Tunicata ...... 



Conchifera ..... 



Gasteropoda ...... 



Cephalopoda ..... 



First appearance of an internal skeleton (Endo-skeleton} 



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SKELETONS OF VERTEBRATA. 



a. Cuticular skeleton, or Exo-skeleton. 

 Dermo-skeleton of Fishes 

 Growth of hair and other epidermic appendages 

 Horns of the Deer 



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