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 I. fig. 6 a, com- 
prising the sixth and seventh ridges, and drawn to natural size. 
Prarie Wee 
Fig. 1.—Elephas Hysudricus. Fragment of upper jaw containing 
second and third milk molars. Age of individual about same as in 
Pl. VI. fig. 3.—B.M. 
Figs. 2 and 2 a.—FElephas Hysudricus. Fourth tooth, or first true 
molar, upper jaw, right side; 12 plates. Vertical Section in B.M. 
Figs. 3 and 3 a.—Hlephas 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 £. 
Hysudricus in Plate). Last grinder of upper jaw. The anterior 
plates are inclined forwards, and by the process of wear they are ground 
down, so that the front part of the tooth is truncated obliquely, before 
the posterior lamelle 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. 
Fig. 6.—Elephas Hysudricus. Inferred to be lower jaw ? left side ? 
with second milk molar. Large variety, with 9 plates—B.M. 
Length, 3-4in. (Width in front, 1-1in. Width behind, 1°8 in. 
Figs. 7 and 7 a.—E ephas Hysudricus. Fragment of lower jaw, left 
side, with second milk molar, showing 7 or 8 plates.—B.M. 
Length, 3:lin. Width, 1°65 in. 
Fig. 8.—Elephas Hysudricus. Lower jaw, left side, with third milk 
molar.—B.M. 
Length, 5‘5in. Width, 2°2in. No. of plates, 9. 
Fig. 9.—Llephas 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, 7 situ. The tooth is more elongated, and 
higher. The points of the plates are | ridge of the third milk molar is in front. 
few, being about 6 to the fifth and sixth Length of first trne molar, 6°65 in. ; 
plates. The apices of the plates are | greatest width, 3°4in.; height at fourth 
somewhat ineurved or bent forward. | ridge, 3°5in.; has 7 principal ridges with 
The specimen consists of the back | front and back ridge. 
portion of left side of palate, The last | 
