"Endoskeleton" Quotes from Famous Books
 ... true of several groups of Vertebrata which have lived through a considerable range of time, that the endoskeleton (more particularly the spinal column) of the older genera presents a less ossified, and, so far, less differentiated, condition than that of the younger genera. Thus the Devonian Ganoids, though almost all members of the same sub-order as 'Polypterus', ...
— Geological Contemporaneity and Persistent Types of Life • Thomas H. Huxley |
