ABSTRACT
Any attempt at Classification will be met by criticism, and counter-schemes. It is vain to hope that anything like finality has as yet been attained. My object is to throw together facts, to record the names of the books which touch upon portions of the subject, to indicate the habitat of tribes whose existence is known : two courses are open : either to do this in Alphabetical order, or to throw over the subject such a Classification, as will be simple, convenient, and intelligible, and then work it out. I have chosen the latter method, and rightly or wrongly adopted the six main divisions of F. Müller : but all my minor subdivisions are strictly Geographical, and I have worked out the details on my own responsibility, as I have had ampler Materials available than any of my predecessors.
