. Bulletin of the Department of Geology. Geology. 506 University of California Publications in Geology [VoL-10 surface is sigmoid in dorso-ventral direction toward the external side. Internally this surface is flatter. The distal end bears a heavy carina with an offset along the lower portion of the inner side. Measurements of Second Metacarpal, no. 19872 Total length a89 mm. Depth of distal carina Greatest width of distal end a, Figs. 26a and 26b. Nothrotherium shastense hawveri, n. subsp. Third meta- carpal (?), no. 19861, X V-2- Fig. 26a, lateral view; fig. 26b, view
. Bulletin of the Department of Geology. Geology. 506 University of California Publications in Geology [VoL-10 surface is sigmoid in dorso-ventral direction toward the external side. Internally this surface is flatter. The distal end bears a heavy carina with an offset along the lower portion of the inner side. Measurements of Second Metacarpal, no. 19872 Total length a89 mm. Depth of distal carina Greatest width of distal end a, Figs. 26a and 26b. Nothrotherium shastense hawveri, n. subsp. Third meta- carpal (?), no. 19861, X V-2- Fig. 26a, lateral view; fig. 26b, view of distal end. Pleistocene of Hawver Cave, near Auburn, California. The distal portion of a metapodial (figs. 26«, 266), no. 19861, from Hawver Cave resembles most closely the corresponding part of the median metacarpal of Nothrotherium. The shaft at the middle is nearly square in section, and is more slender than that of the corre- sponding metapodial of Megalonyx or of Hapalops. Its distal end is also not so large as that in the latter genus. The carina is nearly straight, thus differing somewhat from that in either the Miocene form or in Megalonyx. Articulating offsets are present along the lower half of each side of the distal carina. Measurements of Metapodial, no. 19861 Greatest depth of distal end mm. Width of distal end 31 Contrasted with the tibia of Megalonyx, the specimen from Haw- ver Cave, no. 19965, is smaller but similar in general shape. As in the former genus and also as in Hapalops the proximal and distal extremities are much expanded, particularly the proximal end. The proximal half of the shaft below the articulating surface differs from that of Hapalops in being flatter and not as thick anteroposteriorly. This is distinctly seen in end view where in the tibia of Hapalops the anterior tuberosity is very prominent. Scott describes the proximal portion of the shaft of the tibia in H. longiceps as being trihedral in shape. In Nothrotherium it would appea
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