Slide showing two diagrams of 'foetal perameles' and two diagrams of 'cynodont'. Slideshows four black and white diagrams. Two are labelled 'foetal perameles' and two are labelled 'cynodont'. The top two images are labelled as follows: 'surangular, stapes, incus, dentary, malleus, manutrium of malleus, tympanic'. The bottom two images are labelled as follows: image 1 - 'dentary, articular, ang'. Image 2 - 'articular, angular, surangular'. Cynodont are extinct mammals with dog-like teeth. Perameles are long-nosed bandicoots. Late 19th - early 20th century