426 LIST,\, E,\STEKN AND CENTRAL
large and buccally distended. Small metacone lies
opposite moderately enlarged hypocone. Wide splay
between large lingual and mesiobuccal roots; less
splay between the two buccal roots.
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Institute of Vertebrate Paleontology and Paleoanthropol-
ogy, P. 0. Box 643,100044 Beijing, China.