. Annals of the Carnegie Museum. Carnegie Museum; Carnegie Museum of Natural History; Natural history. Douglass: A'ertebrates from Montana Tertiarv. 191 Measurements. Mm. I'"r()in fiMiit of incisor to JDack of ,, 26 Length of alveolus of permanent premolar 6 I -ength of dp J- Width " " 3 From the Lower Madison Mylagaulus Paniensis ? No. 731. Fig. 29. A separate permanent premolar (No. 731) found in the lower Madi- son Valley beds, may belong to the above named species. It is figured to show the partial covering of cement which is quite thick on the middle portion of
. Annals of the Carnegie Museum. Carnegie Museum; Carnegie Museum of Natural History; Natural history. Douglass: A'ertebrates from Montana Tertiarv. 191 Measurements. Mm. I'"r()in fiMiit of incisor to JDack of ,, 26 Length of alveolus of permanent premolar 6 I -ength of dp J- Width " " 3 From the Lower Madison Mylagaulus Paniensis ? No. 731. Fig. 29. A separate permanent premolar (No. 731) found in the lower Madi- son Valley beds, may belong to the above named species. It is figured to show the partial covering of cement which is quite thick on the middle portion of the tooth, but thins out to wards the top, so that the enamel is nearly bare. Rodent. No. 802. An incisor tooth from the Loup Fork beds of ;-, .^*„ the Lower Madison valley indicates a large rodent —larger than the existing beavers. Judging by feiiKi.''fii its curvature it is an inferior incisor. On the anterior surface there are about a dozen small , ^' ' ? •' , laganiHS pameiisis l longitudinal striae with still smaller cross-stria- /^^q 7^1). Lower tions. The striated enamel surface reaches from Madison valley. \\ the anterior inner angle of the tooth, where it natural size, a, per- is bounded by a longitudinal groove, to near the m^nentpremolar,side .,,,-, r 1 • 1 view; b, same, crown middle of the outer surface, where it ends view. abruptly, this surface being somewhat elevated above the surface just posterior to it. The antero-posterior is much greater than the transverse diameter, making it less near an ef^uilat- eral triangle in section than the corresponding tooth of the Beaver, Castor canadensis. Mm. Antero-posterior diameter of tooth 12 Transverse diameter I .ength of portion of tooth preserved So. 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 Carnegie Museum; Carnegie Museum of Nat
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