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Excerpt from Natural History, or Second Division of "the English Cyclopaedia": Supplement
Actinozoa. This class is now re resented by nearly 3000 reputed species, while the allied class 0 Hydrozoa contains not many more than 500 species, and certainly less than 1000. Accompanying this disparity in numbers, it is noticeable that the H ydrozoa present wider and more numerous modifications of their arche plan of structure than do the Actimsoa. It is also notices e that the Hydrozoa have a simpler organisation than the Actinozoa, and that the former are, generally speaking, smaller than the latter.
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