Well, the dictionary definition of "bulb" in the context of light bulb shapes is pretty broad. Soooooo....Do you have a more specific type of bulb you imagine the 2 dimensional tomb representation extruded into the realm of 3d as, preferably without any expected lost in translation so typical of such an endeavor? Maybe something like ZucChiNi Bulb. So that instead of using "bulbed"-shaped and confounding everyone in the vast possibleness of ones imaginations...... just state "ZucChiNied"-shaped and go on to claim there are no "ZucChiNi"-shaped sarcophagi lids in ancient Egypt.
Archae Solenhofen (firstname.lastname@example.org)