Abstract
It is needless to dilate on the limitations imposed on one who undertakes to describe a collection of wrote Dr. H. V. Wilson, foremost authority on modern sponges, forty years ago when he described a collection from Porto Rico. The statement is equally true concerning the difficulties confronting the paleontologist who attempts to describe a group of fossil sponge spicules; indeed, the limitations are multiplied many fold. There are only a few papers describing sponge spicules from North America and this has led some workers to believe that spicules of Paleozoic age are rare. The apparent paucity, however, may be partially explained by the difficulties of classification.
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