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Contents: Report on the Birds and Mammals Collected by the McIlhenny Expedition to Pt. Barrow, Alaska, by Witmer Stone; A Description of Microbdella biannulata, with Especial Regard to the Constitution of the Leech Somite, by J. Percy Moore; New and Unfigured Unionidae, by Charles T. Simpson; Additions to the Insular Land-shell Faunas of the Pacific Coast, Especially of the Galapagos and Cocos Islands, by William Healey Dall; Addendum to Dr. Dall’s Paper: Note on the Anatomy of Guppya Hopkinsi Dall, by Henry A. Pilsbry; Note on the Anatomy of the Helicoid Genus Ashmunella, by Henry A. Pilsbry; Mollusca of the Great Smoky Mountains, by Henry A. Pilsbry; Mallophaga from Alaskan Birds, by Vernon L. Kellogg and Shinkai I. Kuwana; Notes on the Geology of Southeastern Pennsylvania (To Be Concluded), by Theodore D. Rand. Illus.
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