24 



DESCRIPTION OF THE PLATES. 



jaw of Dinotherium giganteum, ^V nat. 

 size. Fig. 7. Grinding surface of lower 

 molars. Kaup. 



PLATE 97. 



Fig. 1. — Fragment of upper jaw with three 

 molars of Halitherium Brocchii, \ nat. 

 size. Fig. 2. Part of lower jaw with 

 three molars of Halitherium Cuvieri, \ nat. 

 size. Fig. 3. Penultimate and last mo- 

 lars of Halitherium Brocchii, nat. size. 

 Fig. 4. Penultimate lower molar, § nat. 

 size, of Halitherium Cuvieri. Fig. 5. 

 Three lower molars, nat. size, of Halithe- 

 rium Cuvieri. De Blainville. 



PLATE 98. 



Fig. 1. — Teeth of the Dog-headed Opos- 

 sum (Thylacinus Harrisii) \ nat. size. 

 Fig. 2. Teeth of the Ursine Opossum 

 (Dasyurus ur sinus). Fig. 3. Teeth of 

 the Brush-tailed Opossum (Phascogale 

 penicillata) . Fig. 4. Teeth of the 

 Banded Bandicoot (Myrmecobius fas- 

 ciatus). Fig. 5. Skull and teeth of the 

 Long-eared Bandicoot (Perameles lagotis). 

 Fig. 6. Teeth of the Virginian Oppossum 

 (Didelphis virginiand). In each of the 

 above figures p is the premolars, m, the 

 true molars. Original. 



PLATE 99. 



Fig. 1. — Right ramus of the lower jaw with 

 all the teeth, save the canine, /, of the ex- 

 tinct Amphitherium Prevostii of the 

 Stonesfield oolite : i, incisors ; p, premo- 

 lars ; m, true molars. Fig. 2. A mutila- 

 ted fossil jaw of the same species, show- 

 ing the implantation of the teeth by two 

 roots in distinct sockets. Fig. 3. Left 

 ramus of the lower jaw of Amphitherium 

 Broderipii, with the missing teeth restored 

 in outline. (The original is in the Museum 

 at York.) Fig. 4. Inner side of right 



ramus of lower jaw of the Phascolotherium 

 Bucklandi : i, incisors ; I, canine ; p, 

 premolars ; m, molars. The natural size 

 of each specimen is given in outline. Ori- 



PLATE 100. 



Fig. 1 . — Teeth of the Phalangista vulpina. 

 Fig. 2. Teeth of the Phalangista Cookii. 

 Fig. 3. Skull and teeth twice nat. size 

 of the Phalangista gliriformis. Fig. 4. 

 Teeth of the Petaurus flaviventer. Fig. 5. 

 Lower jaw of the Petaurus pigmceus. 

 Fig. 6. Teeth of the Koala (Phascolarctus 

 fuscus). Fig. 7. Teeth of a Potoroo 

 (Hypsyprymnus) . Fig. 8. Teeth of a 

 Kangaroo (Macropus). Fig. 9. Teeth of 

 a Wombat (Phascolomys Vombatus). 



PLATE 101. 



Fig. 1. — Portion of lower jaw of a great 

 extinct Kangaroo (Macropus Titan) show- 

 ing the second true molar, and the germ 

 of the premolar in the closed alveolus. 

 Fig. 2. Grinding surface of the second 

 premolar of Macr. Titan. Fig. 3. Por- 

 tion of lower jaw of another species of 

 great Kangaroo (Macropus atlas), show- 

 ing the incisor, the first deciduous 

 molar in outline, the second deci- 

 duous molar, the four true molars, 

 and the germ of the premolar in the 

 closed alveolus. Fig. 4. Grinding sur- 

 face of the second molar of the Macr. 

 atlas. Fig. 5. Inner side of the crown 

 of the lower incisor of the Macr. atlas. 



PLATE 102. 



Fig. 1 . — One half of a transverse section of 

 the lower incisor of a Kangaroo (Macro- 

 pus major), showing the course of the 

 dentinal tubes at d, and the fine fibres of 

 the thick enamel at e. Fig. 2. A single 



