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REPORTS ON THE COLLECTIONS OBTAINED BY THE HANCOCK PACIFIC EXPEDITIONS OF 

 VELERO III OFF THE COAST OF MEXICO, CENTRAL AMERICA, SOUTH AMERICA, AND 

 GALAPAGOS ISLANDS IN 1932, IN 1933, IN 1934, IN 1935, IN 1936, AND IN 1937. 



THREE NEW TREMATODES 



FROM THE GALAPAGOS MARINE IGUANA 



AMBLYRHYNCHUS CRISTATUS 



By PAUL T. GILBERT 



