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Vertebrates - an engraving / illustration of the skeletons of animals with backbones, including two fishes, an amphibian and two reptiles. From The National Encyclopaedia, published in about 1881 by William Mackenzie of Ludgate Hill, London. The sheet is labelled 'Backbone. Plate 3. Vol. 2.' The captions identify the following: 1. Sandpiper (detail of backbone) 2. Chimaera (detail of backbone) 3. Spiny dog-fish (whole skeleton) 4. Perch (whole skeleton) 5. Frog (whole skeleton) 6. Tortoise (whole skeleton) 7. Python (whole skeleton) 8. Triton (detail of backbone) 9. Proteus (detail of backbone) .