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ACKNOWLEDGMENTS This work was supported in part by N ational Science Foundation Summer and Cooperative Fellow ships. This aid i s g r a te fu lly acknowl edged . A number o f in d iv id u a ls contributed to the success o f my work. I am indebted to Mr. Ron Engle o f t h is department for h is a ssista n ce in making f ie ld c o lle c t io n s . Mr. Sheldon Dobkin o f the Marine Labora tory, U niversity o f Miami, made an important contribution by supplying specimens o f Palaemonetes paludosus.doi:10.2307/1539293 fatcat:jixoubb5ozelnmqjb4k3udabr4