. Annals of the Carnegie Museum. Carnegie Museum; Carnegie Museum of Natural History; Natural history. 190 Annals of the Carnegie Museum. of its greater age, longer than the premolar. It appears to be open below and not to have completed its growth. It is very doubtful if this tooth would be shed during the lifetime of the animal. It had not yet come into use, at least it is not worn, though it projects some distance above the alveolar border. M3 was just erupting. Evidently the two temporary molars and the two permanent ones were about equal in length and width. Measurements. Mm. Depth of ram
. Annals of the Carnegie Museum. Carnegie Museum; Carnegie Museum of Natural History; Natural history. 190 Annals of the Carnegie Museum. of its greater age, longer than the premolar. It appears to be open below and not to have completed its growth. It is very doubtful if this tooth would be shed during the lifetime of the animal. It had not yet come into use, at least it is not worn, though it projects some distance above the alveolar border. M3 was just erupting. Evidently the two temporary molars and the two permanent ones were about equal in length and width. Measurements. Mm. Depth of ramus under last molar II Length of dental series 13 Antero-posterior diameter of immature permanent jiremolar 6 Length of dm^j and mSy and ^ each 3 Same beds as the preceding. sp. No. 723. Fig. 28. This specimen, which is a portion of a lower jaw, has lost the pris- matic premolar, which judging by the inner portion of the alveole,. Fig. 28. My/agaitliis} (^o. •J2T,). Lower Madison valley. ^ natural size, a, portion of jaw showing alveolus of F^j , dpj ? and M^ ? M^ ? ; b, crown view of same, Pj ; nl, alveolus of permanent premolar, dp^ temporary premolar. was proportionally as large as in the specimen just described. The last temporary premolar is much reduced, as if by partial absorption, as in the specimen of J/, froximus (No. 842). Its antero-posterior is half its transverse diameter. The crown is nearly worn down to the roots. Mg^ is not so high as in M. pristimis. M3 is still lower. Both the molars might be shed in old 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 Natural History. [Pittsburgh] : Published by authority of the Board of Trustees of the Carnegie Institute
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