Journal of the Academy of Natural Sciences of Philadelphia . nterior and posterior parts of thetooth to thicken. The second molar shows this tendency to a less degree thaneither the first or the third, and the posterior fold to a greater degree than theanterior. The posterior fold is apt to bear a distinct cusp developed in the middleof the posterior commissure. 442 CRANIA FROM THE MOUNDS OF FLORIDA. In the upper jaw the cusps are not so symmetrically arranged as in the lower,nor are the commissures so conspicuous. In figure 32 the parts are typically disposed. The fifth cusp in the secondmola
Journal of the Academy of Natural Sciences of Philadelphia . nterior and posterior parts of thetooth to thicken. The second molar shows this tendency to a less degree thaneither the first or the third, and the posterior fold to a greater degree than theanterior. The posterior fold is apt to bear a distinct cusp developed in the middleof the posterior commissure. 442 CRANIA FROM THE MOUNDS OF FLORIDA. In the upper jaw the cusps are not so symmetrically arranged as in the lower,nor are the commissures so conspicuous. In figure 32 the parts are typically disposed. The fifth cusp in the secondmolar is not an outgrowth of a commissure as in the lower jaw, but is a basalcingule of the Irypocone. The axis of the upper molar is disposed to be contact of the protocone and the mesocone forms an oblique line which has longbeen noted. The greater length of the crown surface in the direction of the paraconeand the hypocone has escaped notice. It is marked in both of the teeth in figure 32. The obliquity in the tooth shown in figure 33 is
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