THIS peculiar amœboid animal was first observed by the late Dr. Jos. Leidy in 1874. Though he recognised in it the essential characters of the genus Amœba, the permanent filamentous appendages with which the posterior end of the body is provided led him to consider it a distinct genus. His description, embodied in “Freshwater Rhizopods of North America,” was published by the United States Government in 1879, a brief notice of the form having appeared previously in the Proceedings of the Academy of Natural Sciences of Philadelphia. Dr. Leidy cites two or more notices of the same animal by Mr. Archer, of Dublin, who, however, held it to be a form of Wallich's Amœba villosa.

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