(1) The Obolellids have a foliated, impunctate, biconvex shell.(2) The posterior chamber is separated from the vitreous body by a transparent biconvex lens.(3) Their molds demonstrate that lenses were numerous, biconvex , hexagonal in outline and arranged in an hexagonal close-packing system.(4) The described specimens are nearly equidimensional to slightly transverse in outline and moderately biconvex in profile.(5) The crystalline lens, which provides approximately 30% of the refractive power, is biconvex and has the ability to change its shape to increase or decrease its focusing power.
