| Date Note | Dates given to other drawings created for Egerton's paper. |
| Administrative History | The annotations indicate that it may have been created for inclusion in Egerton, P M G, “On Chondrosteus, an Extinct Genus of the Sturionidae, Found in the Lias Formation at Lyme Regis”, ‘Philosophical Transactions of the Royal Society of London’, vol 148 (1858). |