"Drawing of Invertebrate Fossils", 1828-1840, 60 x 89 cm., Pen and ink on linen Image courtesy of Edward and Orra White Hitchcock Papers, Amherst College Archives and Special Collections, Amherst College Library.
This illustration was labeled simply "Invertebrate fossils, trilobites etc." At the upper left is a trilobite, but the rest appear to be gastropods, a crinoid, and possibly a belemnite.