The American Naturalist, Volumen21Essex Institute, 1887 |
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Página 992
... Premolars different from molars . a . Superior canine teeth present . 1. Toes 4-3 ; 2. Toes 3-3 ; aa . No superior canine teeth . Lophiodontida . Triplopodida 3. Mastoid bone not exposed in external wall of skull ...
... Premolars different from molars . a . Superior canine teeth present . 1. Toes 4-3 ; 2. Toes 3-3 ; aa . No superior canine teeth . Lophiodontida . Triplopodida 3. Mastoid bone not exposed in external wall of skull ...
Página 993
... Premolars like molars , with two internal lobes above . 9. Toes with digits 4-3 ; ..................... ... 10. Toes ... premolar unlike 1887 ] 993 The Perissodactyla .
... Premolars like molars , with two internal lobes above . 9. Toes with digits 4-3 ; ..................... ... 10. Toes ... premolar unlike 1887 ] 993 The Perissodactyla .
Página 994
A. No diastemata . a . Fourth inferior premolar unlike the first true molar . Last inferior molar with five lobes ; superior premolars four ; ........ AA . A diastema behind the first premolar in both jaws . a . Last inferior premolar ...
A. No diastemata . a . Fourth inferior premolar unlike the first true molar . Last inferior molar with five lobes ; superior premolars four ; ........ AA . A diastema behind the first premolar in both jaws . a . Last inferior premolar ...
Página 995
... have Helaletes ( Marsh ). greater distinctness of the cusps of its molars . The succession of the genera may be represented somewhat as follows : I. Canines very distinct from incisors . Premolars #. 1887 ] 995 The Perissodactyla .
... have Helaletes ( Marsh ). greater distinctness of the cusps of its molars . The succession of the genera may be represented somewhat as follows : I. Canines very distinct from incisors . Premolars #. 1887 ] 995 The Perissodactyla .
Página 996
... premolars are lost . In Hyrachyus the heel of the last inferior molar vanishes , while the nasal bones bear traces of dermal horns in Colonoceras ( Marsh ) . The transition from Hyrachyus to the Rhinocerontid series is not difficult ...
... premolars are lost . In Hyrachyus the heel of the last inferior molar vanishes , while the nasal bones bear traces of dermal horns in Colonoceras ( Marsh ) . The transition from Hyrachyus to the Rhinocerontid series is not difficult ...
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Amer AMERICAN NATURALIST animals appear Artiodactyla Bering Island bones botany breed called cells character chemical color compounds conclusions Condylarthra contains crystals cusps described dike E. D. Cope Eocene evolution eyes facts fauna feet figures fossils four Gard genera genus geological geologists geology Göhrde groups Heptodon hornblende hornless stags horns hundred Hyracotherium Ichthyosaurus incisors inferior molar infra-spinous insects Island J. B. LIPPINCOTT COMPANY known Lambdotherium larvæ lower Menodus mineral Miocene molars natural North notes observed occur original paper Philadelphia plane plants plates polled cattle pollinia portion premolars present probably Proc Prof Professor Protohippus published recently region represented River rocks sandstone says scapular scapular index schists scientific sea-cow sections seen side skull species specimens Spiders structure student superior molars synonymy Taconic teeth tion varieties Vilmorin XXI.-NO