. Bulletin. Natural history; Natuurlijke historie. 3857 3858 3859 Figure 29. Captorhinus sp. from Ft. Sill, Oklahoma. Femur, no. 3857. Dorsal, ventral, and posterior views. Tibia no. 3858, preaxial and post- axial views. Fibula no. 3859, medial surface, x 2. Cardiocephalus femora differ from those of the associated Captorhinus (fig. 29) in greater slenderness and more delicate build, smaller size, and less expansion of the distal end. The adductor ridge is straight and extends far distally whereas in Captorhinus it is irregular, terminates well above the distal end, and ma
. Bulletin. Natural history; Natuurlijke historie. 3857 3858 3859 Figure 29. Captorhinus sp. from Ft. Sill, Oklahoma. Femur, no. 3857. Dorsal, ventral, and posterior views. Tibia no. 3858, preaxial and post- axial views. Fibula no. 3859, medial surface, x 2. Cardiocephalus femora differ from those of the associated Captorhinus (fig. 29) in greater slenderness and more delicate build, smaller size, and less expansion of the distal end. The adductor ridge is straight and extends far distally whereas in Captorhinus it is irregular, terminates well above the distal end, and may have some development of a fourth trochanter for the caudifemoralis muscle. Measurements are given in table 7. Note that the fully adult specimens with ossified articular surfaces form a compact group with average length 9/2 mm. Tibia: Numerous small tibiae which differ from those of Captorhinus in smaller size, much weaker cnemial crest, and somewhat more pronounced expansion of the distal end, are referred to Cardiocephalus; they almost certainly pertain to the animal whose femora have just been described, and occur in comparable abundance. The dorsal surface is slightly convex, the ventral and lateral edges strongly concave. A fine ridge runs the entire length of the lateral edge, doubtless showing attachment of the interosseous membrane. A broad head bears confluent and indistinguishable condyles. Only the larger specimens show any trace of a weak cnemial crest, lateral to which lies a broad shallow sinus (groove for extensor digitorum com- munis ). At the distal end of mature bones two articular facets meet at an obtuse angle, both directed somewhat posteriorly. Immature bones lack articular surfaces and have flat or concave, unfinished ends. Form and proportions of the tibiae are shown in figure 30, Length varies from to mm,, the mean of 151 specimens being Please note that these images are extracted from scanned page images that may have been digita
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