8 



FAUNA ANTIQUA SIVALENSIS. 



Fig. 7. — Elephas insignis. Section of molar showing laminated 

 character of cement filling up the valleys. In some sections as many 

 as eleven distinct strata of this substance may be counted. The 

 section is a portion of the tooth represented in Plate II. fig. 6 a, com- 

 prising the sixth and seventh ridges, and drawn to natural size. 



Plate VII. 



Fig. 1. — Elephas Hysudricus. Fragment of upper jaw containing 

 second and third milk molars. Age of individual about same as in 

 PI. VI. fig. 3.-B.M. 



Figs. 2 and 2 a. — Elephas Hysudricus. Fourth tooth, or first true 

 molar, upper jaw, right side ; 12 plates. Vertical Section in B.M. 



Figs. 3 and 3 a. — Elephas Hysudricus. Fragment of upper jaw con- 

 taining fifth tooth or penultimate true molar, 13 plates. Vertical 

 section in B.M. 



Figs. 4 and 4 a. — Elephas Indicus (erroneously designated E. 

 Hysudricus in Plate). Last grinder of upper jaw. The anterior 

 plates are inclined forwards, and by the process of Avear they are ground 

 down, so that the front part of the tooth is truncated obliquely, before 

 the posterior lamella? have come into use. The plane of detrition 

 makes a large angle with the unworn plane of the crown, and slopes 

 from the inside outwards. On the worn surface the digitated summits 

 of the anterior ridges are found ground down into circular rings of 

 enamel enclosing a pit of ivory. — B.M. 



Fig 5. — Elephas Hysudricus. Fragment of lower jaw, left side, with 

 second milk molar, vertically divided, and showing 7 or 8 plates. 

 Specimen .shows also remains of alveolus of first tooth. — B.M. 



Pig. 6. — Elephas Hysudricus. Inferred to be lower jaw ? left side 1 

 with second milk molar. Large variety, with 9 plates. — B.M. 

 Length, 34 in. Width in front, 1-1 in. Width behind, 1-8 in. 



Figs. 7 and 7 a. — Elephas Hysudricus. Fragment of lower jaw, left 

 side, Avith second milk molar, showing 7 or 8 plates. — B.M. 

 Length, 3-1 in. Width, 1-5 in. 



Fig. 8. — Elephas Hysudricus. LoAver jaw, left side, Avith third milk 

 molar.— B.M. 



Length, 5-5 in. Width, 2-2 in. No. of plates, 9. 



Fig. 9. — Elejyhas Hysudricus. Fragment of lower jaw, with third 

 milk and first true molars. The former has 9 plates ; the latter is in 

 germ. 



Figs. 10 and 10 a. — Elephas Hysudricus. Fragment of loA\ r er jaw, 

 with the first true molar, presenting 12 plates. 



Figs. 11 and 11 a. — Elephas Hysudricus. Fragment of loAver jaAV, 

 with penultimate ? true molar, presenting 12 plates. 



Figs. 12 and 12 a. — Elephas Hysudricus. Fragment of lower jaAV, 

 with last molar, entire, in situ. The tooth is more elongated, and 



higher. The points of the plates are 

 few, being about 6 to the fifth and sixth 

 plates. The apices of the plates are 

 soineAvhat incurved or bent forward. 

 The specimen consists of the back 

 portion of left side of palate. The last 



ridge of the third milk molar is in front. 

 Length of first true molar, 6 - 5 in. ; 

 greatest width, 3 -4 in. ; height at fourth 

 ridge, 3-5 in. ; has 7 principal ridges with 

 front and back ridge. 



