PACHODECARHOMBIS, in natural history, the name of a genus of fossils, of the class of felenite. The word is derived from the Greek πachys thick, rhombos, and hombos a rhombus, and expresses a thick rhomboidal body composed of ten planes. The characters of this genus are, that the felenite of it consist of ten planes; but as the top and bottom in the leptodecarhombes, or most common kind of the felenite, are broader and larger planes than any of the rest, the great thickness of this genus, on the contrary, makes its four longer planes in all the bodies of it, meeting in an obtuse angle from its sides, its largest planes. There are four species of it.