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 



