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Illustrations
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Merychyus elegans: dpper premolars from Leidy's paratype ................ 31
Merychyus curtus: skull, lower jaw, upper and lower dentitions, from the type 32
Merychyus siouxensis: skull from the type ............................... 33
Merychyus delicatus: skull and jaws from the type: Merychyus paniensis:
lower jaw from the type............................................
Merychyus paniensis: front foot: Ticholeptus hypsodus, lower jaw from the
type............................................................ 35
Eporeodon relictus: skull and upper dentitien from the type................ 37
Chamazleon quilensis: occiput; Lophosaura species: occiput, showing the rela-
tions of the tabulars to the neighboring bones......... ...............
Lophosaura teniabronchus: tangential sections through the upper end of the
quadrate and associated bones of an early embryo ....................... 45
Sphenodon punctatus, Eremias capensis, Zonurus polygonus, Mabuia sulcata:
lower jaws with quadrate, epipterygoid and connecting cartilaginous
bar in embryos....................................................
Placochelys placodonta and Dermochelys coriacea: occiputs .................. 54
Placochelys placodonta and Emys orbicularis: skulls ........................ 55
Placodus gigas and Plesiosaurus macrocephalus: skulls.................... 56
Scylacosaurus sclateri: skull................................................ 57
Plesiosaurus macrocephalus and Ictidosuchus longiceps: skulls.............. 58
Placodus species: inner side of mandible; Peloneustes philarchus: inner side of
jaw; Plesiosaurus rostratus: inner side of imperfect lower jaw; Peloneustes
evansi: lower jaw............................................. 60
Diagram: Evolution and Classification of the Reptilia ..................... 64
Youngina capensis: skull................................................. 68
Youngina capensis: portions of the skeleton................................. 71
Youngina capensis: left foot; fifth metatarsal as viewed from under side;
tarsus and metatarsus as viewed from dorsal side ...................... 72
Philander species, Metachirus species, Caluromys derbianus, Chironectes
minimus, Marmosa chapmani, Didelphys virginiana, Borhyena tuberata,
Prothylacinus patagonicus, Cladosictis lustratus, Amphiproviverra mazaniana,
Thylacinus cynocephalus, Dasyurus viverrinus, Sarcophilus ursinus,
Phascogale cristicaudata, Antechinomys laniger, Sminthopsis crassicaudata:
dentitions........................................... ...... 89
Philander species, Metachirus species, Caluromys derbianus, Chironectes minimus,
Marmosa chapmani, Didelphys virginiana, Borhyxna tuberata: skulls.. . 91
Cladosictis lustratus, Amphiproviverra mazaniana, Thylacinus cynocephalus,
Dasyurus viverrinus, Sarcophilus ursinus, Phascogale cristicaudata, Antechinomys
laniger, Sminthopsis crassicaudata: skulls.................... 93
Philander species, Metachirus species, Caluromys derbianus, Chironectes minimus,
Marmosa chapmani, Didelphys virginiana, Borhyena tuberata: skulls ... 95
Prothylacinus patagonicus, Cladosictis lustratus, Amphiproviverra mazaniana,
Thylacinus cynocephalus, Dasyurus viverrinus, Sarcophilus ursinus, Phascogale
swainsoni, Antechinomys laniger, Sminthopsis crassicaudata: skulls 97
Wynyardia bassiana: skull.............................................. 98
Dasyurus viverrinus, Trichosurus vulpecula, Phascolarctus cinereus, Bettongia
species: skulls..................................................... 99
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