The Tertiary of Montana Vol. 2 No. 5
The Tertiary of Montana Vol. 2 No. 5
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didelphoides, gave the following generic characters. Dental formula If, Of, Pm], M-f. "Third superior premolar tooth with two external and an internal cusp ; fourth premolar like the true molar, with two external tubercles, an internal tubercle, and a pos- terior cingulum. Fourth inferior premolar with an internal and a well developed anterior tubercle; the anterior tubercle of the true molars median in position, and much smaller than the internal tubercle. Heels of molars with elevated cusps.
...Orbits not closed posteriorly. Coronoid process of mandible well developed.
Inferior margin of mandible not inflected." With regard to the systematic position Cope says, " letups agrees very closely with Didelphys. The fourth superior premolar has an internal cusp, which is wanting in Didelphys, and the inferior border of the mandible is not inflected. There are also hut three superior incisors on each side. Under these circumstances I prefer to refer this genus to the Bv/rtotheHa rather than to the Marsupalia, but whether its proper place is in the Creodont or Insectivorous subdivisions I cannot yet determine." On page 800 of the Tertiary Vertebrata Cope says that Lepticbis, Ictops, and Meso- dectes belong to a distinct division from Peratherium and Domnina and that this division is perhaps of ordinal value, but it remains uncertain on account of the incompleteness of the specimens.
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To quickly assess the difficulty of the text, read a short excerpt:
didelphoides, gave the following generic characters. Dental formula If, Of, Pm], M-f. "Third superior premolar tooth with two external and an internal cusp ; fourth premolar like the true molar, with two external tubercles, an internal tubercle, and a pos- terior cingulum. Fourth inferior premolar with an internal and a well developed anterior tubercle; the anterior tubercle of the true molars median in position, and much smaller than the internal tubercle. Heels of molars with elevated cusps.
...Orbits not closed posteriorly. Coronoid process of mandible well developed.
Inferior margin of mandible not inflected." With regard to the systematic position Cope says, " letups agrees very closely with Didelphys. The fourth superior premolar has an internal cusp, which is wanting in Didelphys, and the inferior border of the mandible is not inflected. There are also hut three superior incisors on each side. Under these circumstances I prefer to refer this genus to the Bv/rtotheHa rather than to the Marsupalia, but whether its proper place is in the Creodont or Insectivorous subdivisions I cannot yet determine." On page 800 of the Tertiary Vertebrata Cope says that Lepticbis, Ictops, and Meso- dectes belong to a distinct division from Peratherium and Domnina and that this division is perhaps of ordinal value, but it remains uncertain on account of the incompleteness of the specimens.
What to read after The Tertiary of Montana Vol. 2 No. 5?
You can find similar books in the "Read Also" column, or choose other free books by Carnegie Museum to read onlineMoreLess
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