. frr PiGTJRE 36.—Lower jaw of Tinoceras annectens, Marsh (No. 104:-!); seea from the left. Figure ST.—The same jaw, seen from above. c. alveole of lower canine; d. diastema; i. alveole of incisor; m. mental foramen; protection of canine tusk ; s. symphysis. Both figures are one-fourth natural size. In Dinoceras laficeps (Plates XII and XIII), the entire lower jaw is more massive than in Dlnoceras mirahile. The angle of the jaw is stouter, and distinctly inilected (Plate XIII, figure 2, a.)

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