PROCEEDINGS OF THE UNITED STATES NATIONAL MUSEUM 



issued 



SMITHSONIAN INSTITUTION 



U. S. NATIONAL MUSEUM 



Vol. 86 Washington: 1938 No. 3044 



POLYCLADS OF THE EAST COAST OF NORTH AMERICA ^ 



By A. S. Pearse 



Between June 1935 and May 1936, while I was investigating the 

 flatworms known to the oystermen of Florida as "leeches," a number 

 of species of these polyclads were found along the shores of the Gulf 

 of Mexico. In attempting to identify these specimens, I examined 

 turbellarians in the United States National Museum, and the present 

 paper is the result. Twenty-seven species of the order Polycladida 

 are now known from the east coast of North America from Texas to 

 Baffin Bay. Eleven species and three genera are here described as 

 new. 



Grateful acknowledgments are made to George W. Wharton, who 

 prepared serial sections and made valuable suggestions; to Miss Eliza 

 Taylor, for serial sections of Emtylochus; and to Prof. Horace W. 

 Stunkard, who read the manuscript of this paper critically and sug- 

 gested several improvements. 



Order POLYCLADIDA 



Suborder Acotylina: Section Craspedommata 



Family DISCOCELIDAE 



Genus DISCOCELIS Ehrenberg 



DISCOCELIS GRISEA, new species 



FlGUBE 22 



A dozen specimens were collected from the Gulf of Mexico on No- 

 vember 21, 1935, and one on February 10, 1936. When alive, an 



* Published with the permission of the United States Commissioner of Fisheries. 

 85371—38 1 gy 



