23 
on the 6th of May, because of minor airplane trouble we did not get 
away until the morning of the ?th. The 9th saw us back at work at the 
Museum, and Dr. Daiber at the University of Delaware, the day of our 
return to Washington being Sunday, 
ACKHCWL3 
rMENTS 
Of the many to whom the Smithsonian Institution owes so much for 
the happy conclusion of a successful voyage to Quintana Koo--a still too 
little-known corner of the world --only a few can here be named : First 
of all, Mr, and Mrs. J, Bruce Bred in, who suggested, and made possible the 
expedition; Dr, Enrique Beltran, of the Secretaria de Agricultura y 
Ganaderia in Mexico City, who so wholeheartedly supported our objectives 
before the Mexican authorities; Pablo Bush Romero, who introduced us to 
Admiral Armando Cmizares, chief of the naval district embracing Quintana 
Roo, who in turn gave us much more useful information about local weather 
conditions and navigational hazards; Mr. Neil L« Parks, our ever -helpful 
Consul in Merida; Dr. Raymund Zwemer, Deputy Science Advisor to the 
Department of State in Washington; and last but not least, throughout the 
voyage, my ever-industrious , cooperative, and congenial fellow members of 
the scientific staff of the expedition. We are also deeply indebted to 
our Embassy staff in Mexico City, to the Federal Government of Mexico, to 
many of the residents of Isla Cozumel, particularly Father James Nagle, 
S.J., who interested the boys in his school in securing small stingrays 
in quantity needed by Dr. Daiber for his elaemobranch studies, and to Mr. 
Robert S. Fuller of Grand Cayman, a correspondent of the Museum, whose 
