1. M 1 and M 2 have large protocone lobs. 2. In addition, they have a prominent protocone on their first, upper molars. 3. There is a protoflexus an indentation in the crown in front of the protocone . 4. The upper molars have four cusps : paracone, metacone, protocone , and hypocone. 5. There is a spur at the back of the protocone , suggesting a rudimentary hypocone. 6. The two cusps on the middle part of the molar, the paracone and the protocone , are broadly connected. 7. The main cusp is protocone ; among the other two cusps, the paracone is higher but the metacone larger. 8. The protocone is connected to the paracone by a protoloph, which lacks a small cusp ( the paraconule ). 9. No crest connects the protocone to the metacone, but there is a cingulum at the back margin of the tooth. 10. In the cheek teeth of " Pakicetus ", the protocone lobe increases from the first molar to the third.
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