ENTEROPNEUSTA 



By Joel W. Hedgpeth, Scripps Institution of Oceanography, University of California 



The balanoglossids of the Gulf of Mexico are 

 incompletely known; determination of various 

 finds in coastal waters are contingent upon revi- 

 sionary work in the genera concerned. A large 

 species of Balanoglossus, some specimens exceeding 

 50 centimeters in length, is common in the vicinity 

 of Englewood, Florida. A similar, if not identical, 

 species occiu^ in the Grand Isle region, especially 



near the eastern end of the island in the mud flats. 

 A small acorn worm, belonging to the genus Sac- 

 coglossiis, occurs in the clean sand flats at Rock- 

 port, Texas. Found at Dry Tortugas, and to be 

 expected elsewhere in the Gulf in coarse coral 

 sand, is Ptychodera hahamensis, a species occurring 

 generally in the Caribbean region. 



