. Annual report - New York Zoological Society. Zoology. 150 NEW YORK ZOOLOGICAL COMMUX XEWT, DIEMYCTYLVS VIRlDEi,\. the curious transformation of the gills took place. A\'hen first placed in the water their gill stalks were much aborted, appear- ing as mere stumps, with little or no traces of filaments. During the first week in water the animals often came to the surface for air. At the end of this time the gill stalks had become longer, and were well studded with short crimson filaments. The devel- opment of the gills increased until the filaments were as long and feathery as th
. Annual report - New York Zoological Society. Zoology. 150 NEW YORK ZOOLOGICAL COMMUX XEWT, DIEMYCTYLVS VIRlDEi,\. the curious transformation of the gills took place. A\'hen first placed in the water their gill stalks were much aborted, appear- ing as mere stumps, with little or no traces of filaments. During the first week in water the animals often came to the surface for air. At the end of this time the gill stalks had become longer, and were well studded with short crimson filaments. The devel- opment of the gills increased until the filaments were as long and feathery as those of Necturus—the Mud Puppy. The Siren is fond of small frogs, and consumes its prey in a manner that seems quite voracious for such a soft-bodied crea- ture. When two individuals seize the same frog they spin in oppo- site directions, soon dismembering the animal. Another observation relating to a transformation of the branchiae of aquatic batrichians concerns the Mud Puppy (Necturus macu- latus). Specimens received from cold lakes had very short gill stalks, and these were provided with a very rudimentary fringe— quite unlike the feathery branchiae of the majority of specimens. In the comparatively warm water of an indoor aquarium, neces- sitating more elaborate processes for aerating the blood, a change. 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 New York Zoological Society. New York, The Society
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