CHAPTER IV.

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