I read about this unsolved enigma here: http://www.archimedes-lab.org/latin.html. I think I have solved it. Aelia Laelia is a horse or mule with a curly mane whose carcass was burned, and it’s not an inscription on a tomb but on a horseblock at the side of the road. (On horseblocks, see here: http://discourse.textkit.com/t/horseblock-to-the-foot-gods/10749/1) The last six lines below don’t belong to the original, I say (after looking at Malvasia), but have been added by a writer from another source.
De Aeliae Laeliae aenigmate non exsoluto legi. Credo me id exsolvisse. Equa mulave comis crispis seu jubâ crispâ, cuius cadaver ustum est. Nec sepulcralis inscriptio sed in suppedaneo equorum insultandorum desultandorum propter viam (de quo aliò epistulam misi). Meâ mente, illi versum sexti terminantes ad pristinam inscriptionem non attinent. Addantur ab alio fonte, id mihi videtur (post opus Malvasiae consultavi).
This seems to me to apply to an object (possibly a box bearing the inscription) made of human bone, as well as to any unburied body. Hi versus, id mihi videtur, ad rem (forsit cistam cum inscriptione ipsâ) quae osse humano facta est pertinent et ad ullum cadaver insepultum.
A copy of the Bologna stone is shown here. No appended verse! // Simulacrum Aeliae Laeliae saxi hîc demonstratum (sine appendice, nota!): http://aeliamedia.org/?page_id=443