. Bulletin of the Department of Geology. Geology. 150 University of California Publications in Geology [Vol. 10 of the first tooth in Nothrotherium the deeply concave, outer wall of mandible between MT and Mj, occurring in Hapalops and Megalonyx, becomes greatly reduced and may be entirely absent as in no 166. There are frequently two foramina representing the postero-external opening of the dental canal in the Raneho La Brea species. In no. 208 two foramina are present on the left ramus and one on the right, an occurrence similar to that in a skull of Hapalops longiceps, no. 15523 Prin. Univ.
. Bulletin of the Department of Geology. Geology. 150 University of California Publications in Geology [Vol. 10 of the first tooth in Nothrotherium the deeply concave, outer wall of mandible between MT and Mj, occurring in Hapalops and Megalonyx, becomes greatly reduced and may be entirely absent as in no 166. There are frequently two foramina representing the postero-external opening of the dental canal in the Raneho La Brea species. In no. 208 two foramina are present on the left ramus and one on the right, an occurrence similar to that in a skull of Hapalops longiceps, no. 15523 Prin. Univ. Coll., wbile in no. 456 from Raneho La Brea there are two foramina on each side. The anterior foramen is situated on the outer surface of the ramus opposite the last inferior tooth and the second opening is at or slightly above the base of the ascending process. The eoronoid process arises well to the outer side of M3 as in Hapalops. but it is relatively smaller than in the latter. It may be. Fig. 6. Nothrotherium sJiastense Sinclair. Mandible no. 166 M. IT. S. A., lateral view, X %. Raneho La Brea Beds, California. broad as in no. 456 or rather narrow. The sigmoid notch, due to the high position of the condyle above the tooth row in Nothrothevium, is relatively much smaller than in the Miocene genus. In no. 208 the condyle in dorsal view has much the shape seen in Hapalops longiceps. In no. 456 and no. 418 the condyle has a greater oblique diameter and is more slender than in no. 208. The ventral notch between and angle is relatively wider than in Hapalops, while the angular process in some specimens from the asphalt extends posteriorly as a more slender hook than in H. longiceps. The angle of the jaw is much more slender in Nothrotherium than in Megalonyx. In M. jeffersoni the eoronoid and angle are more nearly equally spaced on either side of the condyle than in the Raneho La Brea genus. The inferior border of the angle is deflected inward, forming a more pronounce
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