DESCRIPTION OF THE PLATES. 



33 



deciduous teeth, left side, lower jaw of a 

 Sheep of twenty months, i 1, First per- 

 manent incisor ; i 2, crown of second 

 permanent incisor ; d 2 and d 3, second 

 and third deciduous incisors ; d, c, deci- 

 duous canine ; d 1, 2 & 3, the three deci- 

 duous molars; p. 1, 2, 3, the crowns of 

 the three premolars,* which displace 

 them ; m. 1, 2, 3, the three true molars. 

 Original. 



PLATE 134. 



Grinding surface of second true molar. Fig. 

 1. Sheep. Fig. 2. Upper, 2' lower, Gnu. 

 Fig. 3. Upper, 3 1 lower, Ox. Fig. 4. 

 Upper and lower, Aurochs. Fig. 5. Up- 

 per and lower, Megaceros. Fig. 6. Upper 

 and lower, Elk. Fig. 7. Upper and lower, 

 Giraffe. Fig. 8. Upper and lower, Camel. 

 The same letters indicate the same parts 

 in each of the foregoing figures, which are 

 of the natural size ; o, outer surface ; i, 

 inner surface ; o d, outer crescentic lobule 

 of dentine ; i d, inner ditto ; e, central 

 crescentic enamel island or fold ; p, small 

 column at the inner interspace of the lobes 

 of the upper molars, and at the outer 

 interspace of those of the lower molars, 

 of certain Ruminants. Fig. 9. i, Lower 

 incisor, and c, canines ; of the Gnu. 

 Fig. 10. The same of the Dromedary. 

 Original. 



PLATE 135. 



Fig. 1. Reduced outline of jaws and teeth 

 of Anoplotherium commune. Fig. 2. Grind- 

 ing surface of molar series, upper jaw. 

 Fig. 3. The same of the lower jaw : Ano- 

 plotherium : § nat. size. Fig. 4. Reduced 

 outline of jaws and teeth of Palaotherium 

 magnum. Fig. 5. Grinding surface of 

 molar series, upper jaw. Fig. 6. The 



* These correspond with p. 2, 3 & 4, in the Anoplothere. 

 VOL. II. 



same of the lower jaw; (Palceotherium 

 crassum); \ nat. size. Cuvier. Fig. 7. 

 The molars of the lower jaw of the Ma- 

 crauchenia patachonica : \ nat. size. 

 Fig. 8. Crown of last lower molar, 

 LopModon:\ nat. size. Fig. 9. Crown 

 of last lower molar, Coryphodon : ^ nat. 

 size. Fig. 10. Crown of last lower 

 molar, Anthracotherium : -|nat. size. Ori- 

 ginal. The letters and numerals for indi- 

 vidual teeth signify the same as those ex- 

 plained after PI. 125. The letters for 

 parts of the teeth signify ; o, the outer ; 

 i, the inner surface ; b, the valley entering 

 from the inner surface ; e, its anterior and 

 external termination, sometimes insulated, 

 as at p. 4, fig. 5 ; c, the valley entering 

 from the hinder surface ; o d, the outer 

 crescentic lobule of dentine ; i d, the in- 

 ner lobule ; p, the column at the entry of 

 the valley b. 



PLATE 136. 



Fig. 1. Grinding surface of the upper molar 

 series, right side, \ nat size, of a Horse, 

 (Equus caballus). Fig. 2. Grinding surface 

 of the lower molars, left side, of a Horse, 

 •| nat. size ; b, oblique valley entering 

 the crown from the inner side ; e, its ter- 

 mination, insulated ; c, posterior valley 

 insulated; p, internal column, confluent 

 with the anterior lobe of dentine. Fig. 3. 

 Grinding surface of upper molar of the 

 Hippotherium ; p, the column, insulated ; 

 o,o, the outer sides ; i, i, the inner sides. 

 Fig. 4. Dentition of a Foal six months 

 old, | nat. size ; showing the deciduous 

 incisors, d, 1 , 2, 3 ; the deciduous ca- 

 nines, d, c, and first deciduous molars, 

 d, m ; and the rudimental premolar, p. 1. 

 The other deciduous molars are omitted. 

 Bojanus. Fig. 5. The deciduous and 

 permanent molars from the outer side, 

 c 



