. The Deseado formation of Patagonia . Fig. g8. Astragulus, dorsal aspect—1/2natural size, after Fig. 97. Left tibia, posteriorside—1/5 natural size. Fig. 99. A, Ungual 3; B, Ungual phalanx. —1/2 natural size. especially concave. On the wide proximal end, the innercondyle is concave, the outer convex, the two being sep-arated by a prominent bifid spine. The shaft is slender,with a deep groove down the anterior face especially at the ASMODEUS OSBORNI 139 upper end, while on the posterior face, there is a largeinterosseus crest, which starts just below and external tot
. The Deseado formation of Patagonia . Fig. g8. Astragulus, dorsal aspect—1/2natural size, after Fig. 97. Left tibia, posteriorside—1/5 natural size. Fig. 99. A, Ungual 3; B, Ungual phalanx. —1/2 natural size. especially concave. On the wide proximal end, the innercondyle is concave, the outer convex, the two being sep-arated by a prominent bifid spine. The shaft is slender,with a deep groove down the anterior face especially at the ASMODEUS OSBORNI 139 upper end, while on the posterior face, there is a largeinterosseus crest, which starts just below and external tothe spine, and extends in a sigmoid curve three-fourths ofthe length of the shaft, ending on the internal borderDistally the tibia is flattened antero-posteriorly, and theinternal margin extends as a wide process down to thelevel of the navicular face of the astragulus. The articularfacet for the astragulus is a rectangular depression, beingabout half as wide in the antero-posterior direction as inthe transverse. This facet is only slightly concave and theinner and outer portions are not separated b
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