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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 according to the vertebral doctrine, 85—their morphological classification, 86—Limb-bones of Teleosteans, 92.

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

Of Branchiostoma, 96—Spinal chord, 96—Brain, its size, 97—Brain of Osseous fishes, 97—of Ganoids, 98—of Chondropterygians, 100—of Cyclostomes, 101—Spino-cerebral nerves, 103—Spinal nerves, 107—Sympathic system, 108.

Smell, 109—Sight, 111—Hearing; connection of the ear with the air-bladder, 116—Taste, 119—Touch, 120.

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.