Viii COITTENTS. 



CHAPTEE IV. 



PAOE 



Modifications of the Skeleton . . . .63 



Branohiostoma, 63 — Cyclostomes, 64 — Chondropterygians, 66 — 

 Holocephali, 70— Ganoids, 71— Dipnoi, 71— Chondrostei, 74— 

 Polypteroidei, 77 — Lepidosteoidei, 80 — Amioidei, 82 — Teleostei, 

 83 — Classification of the bones of the Teleosteous skull accord- 

 ing to the vertebral doctrine, 85 — their morphological classifi- 

 cation, 86 — Limb-bones of Teleosteans, 92. 



CHAPTEE V. 

 Myology 93 



General arrangement of the Muscles, 93 — Electric organs, 94. 



CHAPTEE VI. 

 Neurology 96 



Of Branchiostoma, 96 — Spinal chord, 96 — Brain, its size, 97 — 

 Brain of Osseous fishes, 97 — of Ganoids, 98 — of Chondroptery- 

 gians, 100 — of Cyclostomes, 101 — Spino-cerebral nerves, 103 

 ^Spinal nerves, 107 — Sympathic system, 108. 



CHAPTEE VII. 

 The Organs of Sense 109 



Smell, 109 — Sight, 111 — Hearing ; connection of the ear with the 

 air-bladder, 116— Taste, 119— Touch, 120. 



CHAPTEE VIII. 



The Organs of Nutrition and Digestion . . .121 



Food and mode of feeding, 121— Buccal and abdominal cavities and 

 their openings, 123— Mouth and tongue, 123— Forms, texture, 

 and arrangement of teeth, 124— Intestinal tract, 127— Liver, 

 132— Pancreas, 133— Spleen, 133. 



