"ichthyosaurus skeleton", 1828-1840, 46 x 137 cm., Pen and ink on linen Image courtesy of Edward and Orra White Hitchcock Papers, Amherst College Archives and Special Collections, Amherst College Library.
An ichthyosaurus resembled a dolphin. Orra did not create this image from an actual skeleton, as she did not have one to look at, but copied someone else's work. This was not an uncommon practice.