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FISHERY BULLETIN OF THE FISH AND WILDLIFE SERVICE 



(1938), and Hyman (1939, 1940). In addition, 

 there should probably be mentioned Phaenocelis 

 purpurea (Schmarda) 1859 {= Comprostatum in- 

 sularis Hyman, 1944), common in the Florida 

 Keys. 



There remains to be mentioned the turbellarian 

 fauna of the floating Sargassum. This includes 

 acoels, rhabdocoels, and polyclads and has been 

 discussed by the writer in a previous publication 

 (1939b). There are two common Sargassum poly- 

 clads, Gnesioceros sargassicola (Mertens) 1833 and 

 Hoploplana grubei (Graflf) 1892. The former is 

 very similar in appearance to Gnesioceros floridana, 

 and there is some suspicion in the writer's mind 

 that the latter may be only a littoral variant of 

 the former. H. grubei is a small, oval worm with 

 a white reticulation on a brown ground. Large 

 numbers of both species of polyclads were taken 

 from the Sargassum in the Gulf of Mexico by the 

 Bingham Oceanographic Foundation at Yale Uni- 

 versity. There are no records of the occurrence 

 of smaller Turbellaria on the Sargassum in the 

 Gulf of Mexico, but presumably some are present 

 there. 



LITERATURE CITED 



Hyman, L. H. 



1939a. Some polyclads of the New England coa.st, espe- 

 cially of the Woods Hole region. Biol. Bull. 76: 



127-152. 

 1939b. Acoel and polyclad Turbellaria from Bermuda 



and the Sargassum. Bull. Bingham Oceanogr. Coll. 



7, Art. 1, 26 pp. 

 1940. The polyclad flatworms of the Atlantic coast of 



the United States and Canada. Proc. U. S. Nat. 



Mus. 89: 449-495. 

 1944. Marine Turbellaria from the Atlantic coast of. 



North America. Am. Mus. Novitates, No. 1266, 15 



pp. 



PEAR.SB, A. S. 



1938. Polyclads of the east coast of North America. 

 Proc. U. S. Nat. Mus. 86: 67-98. 



and Littler, J. W. 



1938. Polyclads of Beaufort, N. C. Jour. Elisha 

 Mitchell Sci. Soc. 54: 235-244. 

 Pearse, a. S., and Wharton, G. W. 



1938. The oyster "leech," Stylochus inimicus Palombi, 

 associated with oysters on the coasts of Florida. 

 Ecol. Monogr. 8: 605-655. 



SCHBCHTER, V. 



1943. Two flatworms from the oyster-drilling snail, 

 Thais floridana haysae Clench. Jour. Para.sit. 29: 362 



