. Annals of the Carnegie Museum. Carnegie Museum; Carnegie Museum of Natural History; Natural history. Peterson : Description of Stenomylus. 297 fossa very soon fades away on the fibular face of the shaft. The cnemial keel is very prominent, but proportionally shorter than in Oxydactylus; a character which again more nearly approaches the recent forms. The distal end is considerably expanded transversely. The articular facets for the astragalus are nearly in a straight fore-and- aft direction, as in the recent forms, and are divided by a prominent ridge much as in these. The fibula, or externa
. Annals of the Carnegie Museum. Carnegie Museum; Carnegie Museum of Natural History; Natural history. Peterson : Description of Stenomylus. 297 fossa very soon fades away on the fibular face of the shaft. The cnemial keel is very prominent, but proportionally shorter than in Oxydactylus; a character which again more nearly approaches the recent forms. The distal end is considerably expanded transversely. The articular facets for the astragalus are nearly in a straight fore-and- aft direction, as in the recent forms, and are divided by a prominent ridge much as in these. The fibula, or external malleolus, is not pres- ent in the type specimen. Tarsus. — The tarsus is very high and narrow and in general pro- portions quite similar to that in Oxydactylus longipes. The shaft of the calcaneum in Stenomylus gracilis is thinner along the plantar border than in Oxydactylus. There is also a more decided prominence on the plantar angle immediately back of the facet for the cuboid, which causes a greater antero-posterior diameter of the calcaneum at this point than in the latter genus; otherwise there is little or no difference, except in the size of this bone, in the two genera. The astragalus is high and narrow. The external condyle is larger and higher than the internal, which gives a slight asymmetry to the prox- imal trochlea. The internal portion of the facet for the navicular is slightly less convex transversely than in Oxydactylus and the recent forms, but the distal trochlea is otherwise similar to the camels generally. The cuboid, as in Oxydactylus longipes, has a large plantar hook. This gives to the bone an unusually great antero-posterior diameter, while the transverse diameter is small. The proximal face is taken up by the facets for the calcaneum and astragalus in a more nearly equal proportion than in Oxydactylus. In the latter the plantar portion of the astragalar facet terminates in an ascending hook, which is forced farther inward than in the genus here d
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