F KEY TO THE ISOPODS OF THE ATLANTIC COAST OF NORTH AMERICA WITH DESCRIPTIONS OF NEW AND LITTLE KNOWN SPECIES. By Harriet Richardson, Collaborator, Division of Marine Invertebrates. American naturalists have added much to our knowledge of the Atlantic coast isopoda. In 1818 Thomas Say published An Account of the Crustacea of the United States, which was the lirst attempt to contribute to the knowl-edge of the fauna of North America. In 1853 a number of new species from Grand Manan were described by William Stimpson. A report on the invertebrate animals of Vineyard Sound, by A. E. Ver-rell and S. I. Smith, followed in 1874, and in 1880 Oscar Harger's valuable work on the Isopoda of Vineyard Sound and Adjacent Waters was published. In addition to the work done by American naturalists, about this time the Danish naturalists Schioedte and Meinert, in their mono-graph of the Cymothoidce, published descriptions and figures of a num-ber of new species from the West Indies. A few years later (188T) H. J. Hansen gave an account of the fauna of Greenland, and in 1890 the same author greatly increased the number of known species of isopoda from the West Indies. More recently Adrien Dollfus (1896) reported on some new West Indian ArmadUUd'uhv, and Ives in 189-1 described some new species from Yucatan and Vera Cruz. Norman and Stebbing and others to be mentioned later have like-wise contributed to a knowledge of the North American fauna. The aim of the present paper is to give a complete list of all the described species of isopoda on the Atlantic coast of North America, including Greenland and the West Indies. In preparing the synopses of the families and genera, definitions and keys from many authors have been used, those of greatest value Proceedings U. S. National Museum, Vou XXIII— No. 1222. 493
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