428 FAUNA ANTIQUA SIVALENSIS. 



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 Hysudriais. 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 Hystidricus. 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 wear they are groiind 

 down, so that the firont part of the tooth is truncated obliqiiely, before 

 the posterior lamellaa have come into use. The plane of detrition 

 makes a large angle with the miworn plane of the crown, and sIojdcs 

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

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

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



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

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

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



Fig. G. — Elephas Hysudricus. Inferred to be lower jaw ? left side ? 

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

 Length, 3-4 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. Lower jaw, left side, with third milk 

 molar.— B.M. 



Length, 6-5 in. Width, 2-2 in. No. of plates, 9. 



Fig. 9. — Elephas 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 lower jaw, 

 with the first true molar, presenting 12 plates. 



Figs. 11 and 11 a. — Elephas Hysudricus. Fragment of lower jaw, 

 with penultimate ? true molar, presenting 12 plates. 



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

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

 includes a greater number of divisions (17 or 18) than is usual in the 

 last inferior grinder of E. Hysudricus. The specimen is now cut 

 into sections. — B.M. 



Plate VIII. 



Fig. 1. — Elephas Hysudricus. Specimen of cranium in Mr. W. Ewer's 

 collection. Shows the palate with the first and second true molars and 

 tusks on both sides ; the first well worn, and partly ground away in 



