VUl CONTENTS. 



CHAPTER IV. 



PAGE 



Modifications of the Skeleton . . . .63 



Branchiostoma, 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. 



CHAPTER 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. 



CHAPTER VII. 

 The Organs of Sense 109 



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

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



CHAPTER 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. 



