632 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 113 
none of the 10 species that are known only from the eastern part of 
the Pacific have been recorded from the Atlantic. Such evidence, 
limited and incomplete though it is, suggests that one of the most 
important barriers to the pantropical distribution of the non-brachyu- 
ran decapods is the American land mass, combined with the absence 
of suitable island stepping stones in the eastern Pacific. 
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