. Biology in America. Biology. 112 Iliology in America from hoad to tail and veiitrally as far as the arms, where it divid'd In pass forward aloiip: the sides as a pair of folds to the liead. Sueh a condition we aelnally iind in Ainplii- oxus, wlii'e the fossil shark ('ladoselache possessed paired fins placed exactly as we shonld expect them to be had they been derived fiom snch hypothetical fin folds. In the Jai)anese goldfish the anal fins, which are ordinarily single, are paired, as would happen if the paired folds extended further back than nsnal. These folds are supposed to have acted as
. Biology in America. Biology. 112 Iliology in America from hoad to tail and veiitrally as far as the arms, where it divid'd In pass forward aloiip: the sides as a pair of folds to the liead. Sueh a condition we aelnally iind in Ainplii- oxus, wlii'e the fossil shark ('ladoselache possessed paired fins placed exactly as we shonld expect them to be had they been derived fiom snch hypothetical fin folds. In the Jai)anese goldfish the anal fins, which are ordinarily single, are paired, as would happen if the paired folds extended further back than nsnal. These folds are supposed to have acted as balancing: organs originally, but later they became stiengtliened at their anterior and posterior ends while their middle parts dropped. til& 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 Young, R. T. (Robert Thompson), b. 1874. Boston, R. G. Badger
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