SYNOPSIS OF THE CALANOID CRUSTACEANS, EXCLU-SIVE OF THE DIAPTOMIDAE, FOUND IN FRESH AND BRACKISH WATERS, CHIEFLY OF NORTH AMERICA By C. DwiGHT Marsh ^ Honorary Custodian of Fresh-water Copepods, Division of Marine Inverte-brates, United States National Museum The term Calanoida for a suborder of Copepoda is used herein as defined by G. O. Sars. The calanoid species found in North and South America are in the families Centropagidae, Diaptomidae. Pseudodiaptomidae, Senecellidae, and Temoridae. Though this paper is intended specifically to cover the forms of North America, the discussion of species is not limited to those of that continent, but in some cases includes those of the world. Among the Centropagidae of North America are found the genera Limnocalamis and O sfhranticum. The Temoridae of North America include the genera Eurytemiora^ Heteroco'pe^ and Eyischv/ra. The family Pseudodiaptomidae includes the genera Psevdodia'ptornus and SchrtuLckeria. The new family Senecellidae has only one genus, Senecella. KETsr TO the; geneea of the fresh-watee calanoida 1. Endopods of feet 1 to 5, 2-segmented Calamoecia Brady Endopods of feet 1 to 4, 1-segmented, fifth feet of female without endopods 2 Endopods of first feet, 1-segmented; feet 2 to 4, 2-segmeuted 3 Endopods of feet 1 to 4, 3-segmented 4 Endopods of feet 1 to 5, 3-segmented 7 Endopods of first feet, 2-segmented ; feet 2 to 4, 3-segmented ; endopods of female fifth feet, 2-segmented 9 Endopods of first feet, 1-segmented ; second feet, 2-segmented ; third and fourth feet, 3-segmented Senecella Juday 2. Abdomen of male symmetrical, distal segment of exopod of female fifth foot terminating in a long spine Heterocope Sars Abdomen of male asymmetrical, distal segment of exopod of female fifth foot not terminating in a spine Epischura Forbes ^ Doctor Marsh died on Apr. 23, 1932, just one month after this paper was submitted for publication. A complete list of Doctor Marsh's copepod papers is given on pp. 07 and 58. — Editoe. No. 2959.-PROCEEDINGS U. S. NATIONAL MUSEUM. VOL. 82, ART. 18 155089—33 1 1
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