BOTH geologists and zoologists are much indebted to Prof. Broili, of Munich, and the enterprising publishers of Zittel's “Elements of Palæontology,” for a rapid succession of new editions of this indispensable handbook, keeping it up-to-date. It is a compendium of facts, with references to the scattered literature of the subject, such as are needed for research in many directions, and the arrangement of the matter, as originally planned by Zittel, makes it easily used. It still tends to be conservative in admitting new hypotheses or schemes of classification, and most of the additional figures resemble those of the first edition in being actual illustrations of fossils rather than explanatory sketches. The work indeed retains all the essential features of Zittel's incomparable exposition.
Grundzüge der Paläontologie (Paläozoologie).
Von Karl A. von Zittel. Neubearbeitet von Prof. Dr. Ferdinand Broili und Dr. M. Schlosser. Abteilung I: Inverlebrata. Sechste verbesserte und vermehrte Auflage. Pp. viii + 733. 17 gold marks. Abteilung 2: Vertebrata. Vierte vermehrte und verbesserte Auflage. Pp. v + 706. 15 gold marks. (München und Berlin: R. Oldenbourg, 1923–24.)