Contained in a box covered in black paper, this camera lucida is of the prism type described in the Nachet catalogues from 1856 onward. Mounted on the microscope eyepiece, it allowed a simultaneous observation of the field of view and the sheet on which the images of the microscopic specimens were drawn. Belonged to the Gabinetto degli Invertebrati of the Istituto di Studi Superiori of Florence.