what is difference with ethmoid.x3d, perhaps left/right halves or an alternate version? ethmoid is an unpaired single bone
unpaired bone in skull that separates nasal cavity from brain, located at roof of nose, between the two orbits
Joe Williams, John Carlson, Damon Hernandez, Don Brutzman
X3D-Edit 4.0, https://www.web3d.org/x3d/tools/X3D-Edit
X3D Tidy, https://www.web3d.org/x3d/stylesheets/X3dTidy.html