. Cope papers, 1871-[1897. Zoology; Paleontology. i88i.] on the Feet of Mammalia. 543 III. The trochlear ridges and keels at the various movable articulations of the limbs. These are as follows: 1. Looking downwards— a. Intertrochlear crests of the humerus. ^. On the carpal end of the radius. V Metacarpals, distal ends. 5, Tibia distally. £. Metatarsals distally. 2. Looking upwards— a. Radius distally. ^. Astragalus, edges. V. Astragalus distally [Artiodadyla). 5. Phalanges (very weak). The following observations may be mkde respecting the struc- tures included under division III: The trochlea
. Cope papers, 1871-[1897. Zoology; Paleontology. i88i.] on the Feet of Mammalia. 543 III. The trochlear ridges and keels at the various movable articulations of the limbs. These are as follows: 1. Looking downwards— a. Intertrochlear crests of the humerus. ^. On the carpal end of the radius. V Metacarpals, distal ends. 5, Tibia distally. £. Metatarsals distally. 2. Looking upwards— a. Radius distally. ^. Astragalus, edges. V. Astragalus distally [Artiodadyla). 5. Phalanges (very weak). The following observations may be mkde respecting the struc- tures included under division III: The trochlear keels which look downwards are much the most prominent and important. Those enumerated as looking upwards are weak and insignificant, or of a different character from the down-looking ones. The latter are all projections from the middles of the ends of the respective elements. The up-looking are generally projections of the edges of bones. Such are the lateral crests of the astragalus,. Fig I —Right posterior foot of a species of Coryphodon from New Mexico, one- half nat.'size. From Report Expl. W. of looth Mer., G. M. Wheeler iv, PI. Lix. Fig 2 —Right posterior foot of Aphelops megalodus Cope, from Colorado, one- half natural siie. From Report U. S. Geol. Surv. Tferrs., F. V. Hayden, IV, PI. cxxx. and the adjacent edges of the cuboid and navicular bones which. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Cope, E. D. (Edward Drinker), 1840-1897. Philadelphia, etc.
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