. The tailless batrachians of Europe. Frogs; Amphibians. 52 INTRODUCTION, And finally, attention must be drawn to a pro- blematic organ, peculiar to the males of the genus Bufo, termed by Spengel " Bidder's organ," situated Fig. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Boulenger, George Albert, 1858-1937. London, Printed for the Ray society

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