CONTRIBUTIONS TO THE NATURAL HISTORY OF THE ISOPODA. By Harriet Richardson, Collaborator, Division of Marine Invertebrate!^. V. ISOPOD CRUSTACEANS OF THE NORTHWEST COAST OF NORTH AMERICA, c The present paper contains a list of tlie Isopods collected by the Harriman Alaska Expedition, and in addition a number of species from California received from Dr. William E. Ritter, head of the zoolog-ical department of the University of California. Five species are described as new. A little-known species, Idotea (/raeiUima (Dana) is fig'ured for the first time and described more fully than heretofore; and Asellus tomxdensi^ (Harford) also is redescribed and figured. LIST OF REFERENCES. Bate, Spexce. Lord's Naturalist in British Columbia, London, II, 1866, p. 28L Benedict, James E. A Revision of the Cienus Siiaidotea. Proe. Acad. Nat. Sci. Philad., 1897, p. 393. Two New Isopods of the Genus Idotea from the Coast of California. I'roc. Biol. See. Wai?hington, XII, 1898, pp. 54-55. Brandt, F. Crustacea Middendorff's Raise in den Aussersten Norden und Osten Sibiriens, St. Petersburg, II, Pt. 1, 1851, p. 146. Brandt, J. F. Conspectus monographifeCrustai-eorumOniscodorum Latreilli. Uuli. Soc. Imper. des Natur. de ]Moscou, VI, 1833, p. 172. BuDDE-LuND, G. Crustacea Lsopoda Terrestria per faniilias et genera et species descripta, Haunia>, 1885, pp. 261-262, 26-1. Dana, James D. Crustacea United States Exploring Expedition during the years 1838-42 under the coimnand of Charles Wilkes, U. S. N., Philadelpiiia, XIV, Pt. 2, 1853, pp. 704, 742, 778, pi. xlvi, fig. 6; pi. xlix, fig. 7; pi. lh, fig. 4. Catalogue and Descriptions of Crustacea collected in California by Dr. John L. Le Conte. Proc. Acad. Nat. Sci. Philad., VII, 1854-55, pp. 175-177. DoLLKCs, Adhien. Sur quelqnes Isopodes du Musce de Leyde. Notes from the Leyden Museum, XI, 1889, pp. 93-94, pi. v. « Reprinted from the Harriman Alaska Expedition, X, Crustacea, 1904. Proceedings U. S. National Museum, Vol. XXVII— No. 1369. 657
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