PROCEEDINGS OF THE UNITED STATES NATIONAL MUSEUM 



issued ((^5(VHi., vFMl ^y ^' 



SMITHSONIAN INSTITUTION 



U. S. NATIONAL MUSEUM 



Vol. 104 Washington : 1955 No. 3341 



SOME POLYCLAD FLATWORMS 

 FROM THE WEST INDIES AND FLORIDA 



By Libbie H. Hyman 



The polyclads collected on the Fish Hawk Expedition to Puerto 

 Rico in 1898-99 and by the Smithsonian-Hartford Expedition to the 

 West Indies in 1937 have been turned over to me for identification by 

 the U. S. National Museum. There are further available four vials 

 of polyclads taken by W. G. Hewatt in 1946 at Puerto Rico. These 

 three collections furnish the basis for the present article and probably 

 give a fair but far from exhaustive picture of the polyclad fauna of 

 the West Indies. As technical terms and taxonomic categories are 

 carefully defined in an extensive article of mine recently published 

 (Hyman, 1953), it appears unnecessary to repeat these definitions 

 here. Definitions will be limited to families and genera not repre- 

 sented in that article. 



Order Polycladida 



Suborder Acotylea 



Section Craspedommata 



Family Discocelidae Laidlaw, 1903 



Definition: Craspedommata without definite tentacles and with 

 or without definite tentacular eye clusters; pharynx ruffled, medially 

 located; copulatory apparatus close behind the pharynx; prostatic 

 vesicle, when present, interpolated; typically with numerous small 



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