. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 222 Bulletin Museum of Comparative Zoology, Vol. 150, No. 4. •^ • Figure 22. Stereophotographs of tibiae of North American Multituberculata. A) AMNH 16325, ?Eucosmoclon sp., San Juan Basin, right distal fragment, posterodistal view; B) AMNH 16325, lEucosmodon sp., San Juan Basin, left distal fragment, distal view (top is anterior); C) AMNH 16024, Stygimys teilhardi. Torrejon Arroyo, left distal fragment, distal view (top is anterior). Abbreviations: Itc, lateral tibial condyle; mtc, medial tibial condyle. 1424),
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 222 Bulletin Museum of Comparative Zoology, Vol. 150, No. 4. •^ • Figure 22. Stereophotographs of tibiae of North American Multituberculata. A) AMNH 16325, ?Eucosmoclon sp., San Juan Basin, right distal fragment, posterodistal view; B) AMNH 16325, lEucosmodon sp., San Juan Basin, left distal fragment, distal view (top is anterior); C) AMNH 16024, Stygimys teilhardi. Torrejon Arroyo, left distal fragment, distal view (top is anterior). Abbreviations: Itc, lateral tibial condyle; mtc, medial tibial condyle. 1424), right femur lacking head and greater tro- chanter; ?Mesodma sp. (MCZ 20777), left distal fe- mur, and (MCZ 20778) right distal femur; ?Ptilodus kummae (UA 11301), left femoral head and greater trochanter; Ptilodus montanus (AMNH 35490), right femur lacking distal end and left femur lacking head and distal end; P. montanus (USNM 6076), right femur lacking distal end; ?Stijginiys kuszmauli (UMVP 1425), right proximal fragment; ?S. kusz- mauli (UMVP 1426), left femoral shaft; Stygimys teilhardi (AMNH 16024), left greater trochanter and right distal fragment. The multituberculate femoral head ex- hibits a heart-shaped, somewhat flattened and shghtly rugose area representing the fovea capitis femoris (Fig. 19A). The fo- vea, eccentrically situated on the ventral aspect of the femoral head, marks the point of attachment of the ligamentum capitis femoris. Specimens of ?Eucosmodon sp. (AMNH 16325) and ?Stygimijs kuszmauli (UMVP 1426) reveal crests running distally along the ventrolateral aspect of the shaft from the greater and lesser trochanters respec- tively. The patellar groove of ?Mesodma sp. (UMVP 1424 and MCZ 20777) extends proximally past the epiphyseal junction and well onto the dorsal aspect of the shaft (Fig. 21C,E). The obliquity of the groove, as well as its location on the lateral side of the epiphysis, is evident in these speci- mens. Patella (Figure 7) UA 9001—Th
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