This is the third of a series of papers dealing with the crabs collected by His Majesty The Emperor of Japan in Sagami Bay, the first and second being published respectively in vols. 3 and 4 of this journal. This paper is concerned with five new species referable to two previously known and two new genera of the family Xanthidae, viz. Paratergatis longimanus gen. et sp. nov. Medaeus serratus sp. nov. M. planijrons sp. nov. Micropanope obtusidens sp. nov. Neoactumnus convexus gen. et sp. nov.
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