Acanthocephalan Parasites of the Genus Neoechinorhynchus in North American Turtles with the Descriptions of Two New Species

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Abstract
Two n. spp. of Neoechinorhynchus are reported from turtles in Indiana, N. pseudemydis from Pseudemys scripta elegans, and N. chrysemydis from Chrysemys picta marginata. The sp. recognized as N. emydis has been found mature only in Graptemys geographica. Shelled embryos, especially living ones, are of particular value in distinguishing spp. of Neoechinorhynchus which are believed to have greater host specificity than heretofore supposed. Type specimens have been deposited in the Helminthological Coll. of the U. S. Nat. Mus.