Fig. 6

Char. 25: Bones bordering the lacrimal vacuity. a L. guanicoe (ZM 17,209), left side, scored small, bordered by four bones (frontal, maxillary, lacrimal, nasal) (1) b P. vera (AMNH 24,670), left side, scored large, bordered by four bones (frontal, maxillary, lacrimal, nasal) (0). c A. alexandrae (UCMP 26,015), left side, scored bordered by three bones (frontal, maxillary, and lacrimal) (3). d C. hesternus (UCMP 20,040), left side, scored bordered by four bones (frontal, maxillary, lacrimal, and nasal), lacrimal border greatly reduced, frontal border greatly enlarged (4)