2 
In the course of his 1938 cruise in his 45-foot ketch, Trail 
Star , he obtained several decapod crustaceans from the very 
area that we visited this year. As was to be expected, the 
material from this seldom-collected east coast of Yucatan 
yielded a number of new records of occurrence, as well as 
extensions of geographic range. Dr. Chace , in his report on 
described new species from this area. 
staff 
Five zoologists comprised the scientif ic/(of the present 
expedition: Dr. Waldo L. Schmitt, Research Associate, 
Smithsonian Institution, marine biologist especially interested 
in shrimps and crabs and their close relatives; Dr. J. F. Gates 
Clarke, Curator of Insects, U. S. National Museum, an authority 
on economically important tiny moths ( Microlepidoptera - "micros" 
for short); Dr. Harald A. Rehder , Curator of Mollusks , U. S. 
National Museum, who plans a report on the marine shells of 
the Quintana Roo littoral; Dr. Franklin C. Daiber, Professor 
of Zoology, Department of Biological Sciences, University of 
Delaware, ichthyologist and estuarine ecologist, whose chief 
concern on this occasion was an ecologic study of a mangrove 
swamp and its associated fish population; and Dr. Edward L. 
Bousfield, Chief Zoologist, National Museum of Canada, Ottawa, 
a care inologis t specializing on barnacles and amphipod crustaceans, 
especially the beach- inhabiting and terrestrial forms. Mr. 
Bredin and his brother-in-law, Mr. Ernest N. May, also of 
Wilmington, took part in the activities of the expedition during 
