« The shell of the Lulat […] is ovoid, extremely inflated and like humped, so that its depths slightly exceeds its width. Its two extremities are rounded like its sides ; but its dorsum extends up to the half of its length, as a fairly long wing that rounds out in a circular arc. » – M. Adanson: Histoire naturelle du Sénégal : coquillages… Paris, 1757 via BHL.

Adanson: « Outside, it is covered with a thick periostracum, somewhat wrinkled, frangible, and made of a horn-like matter, which folds inwards […] all along its margins, except in the ligament area. » – op. cit.