Journal of the Academy of Natural Sciences of Philadelphia . Fig. 29.—The premolars and molars of thelower jaw (1,827 Morton Collection.) Thefirst premolar, fig. 29, retains depressionon either side of the basal convexity. 30.—The folds of the upper premolar areshown. The first tooth is actually largerthan the second and exhibits a large fold onthe posterior surface of the crown, back ofthe posterior enamel fold. In the molar series the succession of cusps from the monocuspidate to the poly-cuspidate is clearly shown. It is necessary here to distinguish between the formsof the upper and lower
Journal of the Academy of Natural Sciences of Philadelphia . Fig. 29.—The premolars and molars of thelower jaw (1,827 Morton Collection.) Thefirst premolar, fig. 29, retains depressionon either side of the basal convexity. 30.—The folds of the upper premolar areshown. The first tooth is actually largerthan the second and exhibits a large fold onthe posterior surface of the crown, back ofthe posterior enamel fold. In the molar series the succession of cusps from the monocuspidate to the poly-cuspidate is clearly shown. It is necessary here to distinguish between the formsof the upper and lower molars. The lower molars resemble the lower premolars in
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Keywords: ., bookcentury1800, bookdecade1810, booki, booksubjectnaturalhistory
