Osteology Of The Middle Eocene Ceratomorph Hyrachyus Modestus (Mammalia, Perissodactyla) Author Bai, Bin Author Meng, Jin Author Wang, Yuan-Qing Author Wang, Hai-Bing Author Holbrook, Luke text Bulletin of the American Museum of Natural History 2017 2017-06-09 2017 413 1 68 http://www.bioone.org/doi/10.1206/0003-0090-413.1.1 journal article 10.1206/0003-0090-413.1.1 0003-0090 4612938

TABLE 2 Measurements of atlas and axis of Hyrachyus modestus (mm)

AMNH FM 12664
Atlas
1. Maximum length	51.1
2. Dorsal sagittal length	21.8
3. Ventral sagittal length	15.5
4. Maximum width	70.0 a
5. Cranial articular foveae, width	40.8
6. Caudal articular facets, width	40.2
7. Caudal articular facet, Height×width	19.9×17.6
Ratio (%)
1:4	73.0
3:4	22.1
5:4	58.2
7H:7W	113.0
Axis
1. Maximum length	59.03
2. Maximum height	64.09
3. Body and dens, length	59.03
4. Body, length	44.5
5. Cranial articular facets, width	40.73
6. Postzygapophysis, width	30.18 a
7. Fossa, height×width	18.9×19.8