This small paper consists only of an enumeration of the specimens collected by Dr. HUMMELINCK in 1936 and 1937, together with the records of land and fresh water decapods from the articles by RATHBUN (1936) and SCHMITT (1936) on the collections made in 1930. Identifications of many of the brachyuran crabs were made by the late Dr. MARY J. RATHBUN (U.S. National Museum). The senior author is responsible for the identifications of the remainder of the crabs, as well as of the anomurans, while the junior author has determined the caridean species. The material has been deposited in the U.S. National Museum, 'with the exception of the specimens of Coenobita, most of the Gecarcinus, and some of Macrobrachium faustinum, Cardisoma and Uca, which have been presented to the Rijksmuseum van Natuurlijke Historie at Leiden.