| Date Note | 1832 is earliest likely date for this artist, 1833 is earliest publication date for other items in the collection, Dinkel leaves for Britain in 1834 then leaves Agassiz's service between 1836-1837. |
| Description | Watercolour and ink studies of teeth of the fossil fish Ptychodus mammillaris Agassiz, attributed to Joseph Dinkel, [1832-1834]. Locality: Chalk, Kent, from the collection of Heinrich Georg Bronn. According to the printed text, however, the specimens were from the Museum of Paris. |