THE A?^x\ALS MAGAZINE OF NATURAL HISTORY. [SEVENTH SERIES.] No. 21. SEPTEMBER 1899. XIV. — Key to the Isopods of the Pacific Coast of North America, xoith Descriptions of Twenty-two new Species. By Harriet Richardson *. The Isopods of tlie Pacific coast of North America have claimed the attention of a number of naturalists during-the last half of the nineteenth century. Among the first to con-tribute to the knowledge of the fauna of that region was Dana. Stimpson also belongs to the earlier part of that period ; his work on the Crustacea and Echinodermata of the Pacific shores of North America, published in 1857, was the first special treatise on the forms of that locality. In con-nexion with the work of tiie later part of the past fifty years, the names of Stuxberg, Lockington, and Harford form one group as contemporaneous workers (1875-76), those of Schiodte and Meinert and Budde-Lund another group (1888-85), while the publications of Dr. Hansen and Dr. Benedict represent the latest (1898) work on the Isopods of that coast. The number of species already described is 75, and 22 are added in the present paper. These species represent 44 genera and 16 families f. The author has used Dr. Benedict's keys for the genera Synidotea and Arcturus, and is indebted to Professor Sars for * From a separate copy from the ' Proceediugs of the United States National Museum,' vol. xxi. pp. 815-869 (1899). t [The index-list of tribes &c. is here omitted.] Ann. & May. N. Hist. Ser. 7. Vol. iv. 12
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