Joseph-Philippe-François Deleuze, History and description of the Royal Museum of natural history… (1823)
“ The cardiacea consist of more than one hundred and fifty species, divided into five genera, of which the cardium, is the most numerous. It is seldom that the two valves of the cardium cos- tatum, are found belonging to the same individual: the specimen in the Museum is of an uncommon size. The c. æolicullz, cardissa, junonice} and unedo inhabit the seas of hot countries: they are not very common, and are remarkable for their form and colour. The isocardice are very singular shells in the form of a heart, the extremities of which are pointed and twisted like ram's horns. ”
