Abstract
This organ genus pertains to the fin and free pectoral spines of acanthodian placoderm fishes which are widely distributed in late Paleozoic rocks. Specimens of the best known species, G. formosus Agassiz of the Pennsylvanian of Great Britain, may be as much as 40 centimeters in length, indicating fishes of very respectable size, and the specimen dealt with here was probably originally much larger but has lost part of both extremities.
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