jaw of Dinothérium giganteum, 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 molars
of Halitherium Brocchii, nat. size.
Fig. 4. Penultimate lower molar, § nat.
size, of Halitherium Cuvieri. Fig. 5.
Three lower molars, nat. size, of Halitherium
Cuvieri. De Blainville.
PLATE 98.
Fig. 1.— Teeth of the Dog-headed Opossum
(Thylacims Harrisii) J nat. size.
Fig. 2. Teeth of the Ursine Opossum
([Dasyurus ursinus). 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. l.-jffRight ramus of the lower jaw with
all the teeth, save the canine, l, of the extinct
Amphitherium Prevostii of the
Stonesfield oolite : i, incisors ; p, premolars
; m, true molars. Fig. 2. A mutilated
fossil jaw of the same species, showing
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; l, canine ; p,
premolars ; m, molars. The natural size
of each specimen is given in outline. Original.
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 pigmteus.
Fig. 6. Teeth of the Koala (Phascolarctus
fuscus). Fig. 7. Teeth of a Potoroo
(Hypsijprymnus). 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) showing
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. Portion
of lower jaw of another species of
great Kangaroo (Macropus atlas), showing
the incisor, the first deciduous
molar in outline, the second deciduous
molar, the four true molars,
and the germ of the premolar in the
closed alveolus. Fig. 4. Grinding surface
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 (Macropus
major), showing the course of the
dentinal tubes at d, and the fine fibres of
the thick enamel at e. Fig. 2. A single
I dentinal tube magnified 400 linear times,
I showing two dichotomous subdivisions, a
| few primary branches, the secondary minute
1 lateral branches, and the terminal cellules
| at the boundary line next the enamel.
PLATE 103.
Fig. 1.—A portion of a section from the
I extremity of a worn upper tusk of the
I Mastodon giganteus, magnified 350 dia-
I meters, showing at d, the dentinal tubes
I and cells, and at c, the thick cement; r ,
1 a group of the radiated granular cells of
| the cement. Fig. 2. A portion of a
1. section of a molar of the Wombat (Phas-
I colomys Vombatus), magnified 350 dia-
| meters, showing d d, the terminations of
B the dentinal tubes; e, the enamel; and
1 c , c, the coronal cement. Original.
PLATE 104.
|Fig. 1.—Right ramus of the lower jaw of a
| Porcupine (Hystrix cristatus), showing, i,
)■ the crown, and i' the exposed pulp, re-
I ceiving its recurrent nerve, of the scalpri-
I form incisor: p, the premolar; m, the
E* three true molars. Fig. 2. The upper
1 jaw of the Patagonian Cavy (Dolichotis
1 patachonica): i, incisor; p, premolar;
I m, molars. Fig. 3. Teeth of lower jaw
if, of the Patagonian Cavy: i, the incisor;
I p, the premolar; m, the true molars.
I Fig. 4. Upper molars of the Guinea-pig
I (Cavia porcellus) : d,p, deciduous molar;
I p, permanent premolar ; m, molars.
I Fig. 5. Upper teeth of the Rabbit (Lepus
i euniculus) : i, permanent incisor; d i 2,
|i deciduous second incisor ; i 2, permanent
I second incisor; p d, deciduous molars;
: P. premolars ; m, true molars.
PLATE 105.
^Grinding surface of molar teeth of various
genera of Rodents. Fig. 1. Molar series,
right side, upper jaw, magnified, of the
Squirrel (Sciurus vulgaris). F. Cuvier.
Fig. 2. Right series, upper jaw, magnified,
of the Flying Squirrel (Pteromys
taguanoides). F. Cuvier. Fig. 3. Right
series, upper jaw, magnified, of the
Souslik, or Pouched-Marmot (Spermophi-
lus citillus) ; a, young; b, old molars. Cuvier,
Oss. Foss. Fig. 4. Right series, upper
jaw, magnified, of common Marmot
(Arctomys alpinus). Cuvier, Oss. Foss.
Fig. 5. Right series, upper jaw, nat. size,
of the Beaver (Castor fiber). Cuvier, Oss.
Foss. Fig. 6. Right series, lower jaw,
magnified, in two stages of attrition of
the Dormouse (Myoxus avellanus). F.
Cuvier. Fig. 7. Molar series : a, upper;
b, lower jaw, magnified, of the Jerboa
(Dipus sagitta). F. Cuvier. Fig. 8.
Left series, upper jaw, magnified, of the
Gerbille (Meriones indicus). Cuvier, Oss.
Foss. Fig. 9. Right series, upper jaw,
magnified, unworn, of the Rat (Mus
decumanus). Cuvier, Oss. Foss, Fig. 10.
Right series, upper jaw, magnified, in
two stages of abrasion, of the Rat (Mus
decumanus). F. Cuvier. Fig. 11. Right
series, upper jaw, in two stages of abrasion,
of the Cape-Mole (Orycteromys
capensis). Cuvier, Oss. Foss. Fig. 12.
Right series, upper jaw, magnified, of the
Field-Vole (Arvicola amphibia). Cuvier,
Oss. Foss. Fig. 13. Right series, upper
jaw, of the Porcupine (Hystrix cristatus).
Cuvier, Oss. Foss. Fig. 14. Right series,
upper jaw, magnified, of the Agouti
(Dasyprocta Agouti). Cuvier. Oss. Foss.
Fig. 15. Right series, upper jaw, of the
Cavy (Ccelogenys fusca). Cuvier, Oss.
Foss. Fig. 16. Right series, upper jaw,
magnified, of the Guinea-Pig (Cavia porcellus).
Cuv. Oss. Foss. Fig. 17. Right