| Date Note | Known activity of artist based on other dated drawings |
| Description | Watercolour studies, with pencil profiles, of two teeth of the fossil fish Lamna contortidens Agassiz, by Jacques Bourkhardt, [1835-1841]. From the Molasse, La Chaux de Fonds, possibly from the collection of Jules Thurmann. |
| Administrative History | Collected/drawn as part of the research for Louis Agassiz's 'Recherches sur les Poissons Fossiles' (1833-1843/1844). |