is united with a metaconule at the posterior end, through a narrow channel.
The paracone and metacone
with their sloping cristae are well preserved.
The paracone is slightly taller than the metacone
, the protocone is large and displaced mesially.
"lobule" is smaller than the paracone one.
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The posterior walls of the protocone and the paracone show low posterior spurs that connect, at medium level, to the hypocone and the metacone
The protocone is on the anterior margin of the tooth and the metacone
is the largest cusp.
Using these criteria, four age groups were identified, which were suspected to represent annual cohorts characterized as follows: 1) young adults--slight to moderate wear on paracone and metacone
of P4, M1, and M2, but protocone only slightly worn, P3 with virtually no (or only slight) wear; 2) adults--distinct wear on cones of P4 and all molars but individual cones clearly separated from each other except on M3 (wear had obliterated divisions between some cones and styles), P3 moderately worn; 3) adults--cones no longer distinct on molars, some cone integrity remains on P4, top occlusal surface of P3 nearly flattened; 4) old adults--P3 appearing as a flattened peg, P4-M3 heavily worn, cones distinct (if present) only on labial margin of teeth.
The paracone is contiguous with metacone
through a narrow channel at the posterior side.
The ectoloph appears flat and the metacone
rib appears absent.
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Remarks--The ectoloph of this tooth is strongly pigmented on the faces of the shearing blades below the postparacrista, premetacrista, and postmetacrista, but the pigment stops before reaching the base of the paracone and metacone
. It seems to represent a medium-sized shrew, much smaller than Megasorex and Blarina and about the size of Notiosorex crawfordi and Sorex trowbridgii.