Girty, G: Carboniferous Formations and Faunas of Colorado (C

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Girty, G: Carboniferous Formations and Faunas of Colorado (C

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O knihe

Excerpt from The Carboniferous Formations and Faunas of Colorado

It seems desirable to offer a few words of explanation, or it may be of excuse, for several omissions and commissions in the following pages that may be considered serious enough to excite criticism. One license which I have permitted myself. Is the equalization, for purposes of convenience and simplicity, of zoological groups whose unequal importance is generally recognized. That the difference is of so general recognition is perhaps the greater excuse for this lax usage, this concession to convenience. I refer at present especially to the placing of the Bryozoa and Brachiopoda and the several divisions of the true Mollusca upon a temporary parity with the Protozoa, the sponges, and the other groups having the rank of classes. This arrangement has been observed in the tables and in the discussion. Of' species, and is one which the paleontologist is almost certain to make, mentally at least, in studying a varied fauna. It amounts, in short, to breaking up the larger and more unwieldy groups into recognized subdivisions, from which the master titles are omitted. A slightly different practice is that of the constant use of subgeneric names in a titu lar'ly generic sense. For convenience and brevity, each subgenus has been written free, as if itwere an independent genus; an indulgence from which I would certainly have abstained had this work been planned upon systematic or biologic lines.

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