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which it is necessary to construct a new superfamily. The two remaining species are referred to known genera. The type-specimens have been given to the United States National Museum, while duplicates are in the collection of the University of South Dakota. Tribe BRACHYURA. Subtribe Dromiacea. In this subtribe the oviducts perforate the coxae of the second pair of ambulatory legs, while the semmal ducts perforate the coxae of the last pair of legs. The last pair of legs are dorsal in positiondoi:10.5479/si.00963801.52-2182.385 fatcat:dlgyrs2j4vdhte6dwvf72uprci