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attempting to examine or describe particular instances—in which, however, the main interest of the work must eventually be centred—it would add very much to the clearness of what follows if a classification could be hit upon, which would correctly represent the sequence of forms. In the present state of our knowledge such an arrangement is hardly possible, still the following 5 groups, with their subdivisions, are sufficiently distinct to enable them to be treated separately, and are so arranged as roughly to represent what we know of their sequence, with immense overlappings, however, on every joint.

The first three of the sub-divisions of the first class are so mixed together that it is almost impossible in the present state of our knowledge to separate them with precision either as to date or locality, while, as they hardly belong to the main subject of this book, it will not be worth while to attempt it here.

Without being too speculative, perhaps, it may be assumed that